2007 GMC T-Series Owner Manual M

Seats and Restraint Systems ...................... 21 Driving Your Vehicle .................................. 147
Front Seats ............................................ 22 Your Driving, the Road, and
Safety Belts ............................................ 28 Your Vehicle ..................................... 148
Child Restraints ...................................... 43 Towing ................................................. 182
Restraint System Check ......................... 56 Service and Appearance Care ................... 189
Features and Controls ................................. 59 Service ................................................. 191
Keys ....................................................... 60 Fuel ...................................................... 195
Doors and Locks .................................... 61 Checking Things Under the Hood ......... 206
Windows ................................................ 62 Rear Axle ............................................. 241
Starting and Operating Your Vehicle ....... 65 Cab Tilting ............................................ 242
Mirrors .................................................... 93 Noise Control System ........................... 248
Storage Areas ........................................ 94 Bulb Replacement ................................ 250
Windshield Wiper Blade Replacement ... 250
Instrument Panel .......................................... 97 Other Service Items .............................. 251
Instrument Panel Overview ................... 100 Tires ..................................................... 254
Climate Controls ................................... 114 Appearance Care .................................. 267
Warning Lights, Gages, Vehicle Identification ............................. 275
and Indicators .................................... 118 Electrical System .................................. 276
Audio System(s) ................................... 137

Downloaded from www.Manualslib.com manuals search engine

 Capacities and Specifications ................ 285 Customer Assistance Information ............. 327
Normal Maintenance Customer Assistance and Information .... 328
Replacement Parts ............................ 288 Reporting Safety Defects ...................... 336
Maintenance Schedule ............................... 291 Vehicle Data Recording and Privacy ..... 339
Maintenance Schedule .......................... 292 Index ........................................................... 343

Downloaded from www.Manualslib.com manuals search engine

 Keep this manual in the vehicle, so it will be there
if it is needed while you are on the road. If the
vehicle is sold, leave this manual in the vehicle.

Canadian Owners
A French language copy of this manual can be
obtained from your dealer/retailer or from:
GENERAL MOTORS, GM, the GM Emblem,
GMC, and the GMC Truck Emblem are registered Helm, Incorporated
trademarks of General Motors Corporation. P.O. Box 07130
Detroit, MI 48207
This manual includes the latest information at the
time it was printed. We reserve the right to make
changes after that time without further notice. Emission Control Systems Warranty
For vehicles first sold in Canada, substitute the The emission warranty on your vehicle is issued in
name “General Motors of Canada Limited” for GM accordance with the U.S. Federal Clean Air Act.
Medium Duty Truck Division when it appears in this Defects in material or workmanship in Isuzu
manual. emission parts may also be covered under the
This manual describes features that may be Medium Duty Truck Limited Warranty coverage.
available in this model, but your vehicle may not There may be additional coverage on GM diesel
have all of them. For example, more than one engine chassis. In any case, the warranty with the
entertainment system may be offered or your broadest coverage applies.
vehicle may have been ordered without a front
passenger or rear seats.
Litho in U.S.A.
©
Part No. 15862470 B Second Printing 2006 General Motors Corporation. All Rights Reserved.

Downloaded from www.Manualslib.com manuals search engine

 What Is Covered Federal Emission Control System
The parts covered under the emission warranty Warranty
are listed under the “Emission Warranty Parts List” Federal Warranty Coverage is as follows:
later in this section. • Vehicles with a 8,500 GVWR or less equipped
How to Determine the Applicable with a Light Duty Emission Control System
Emission Control System Warranty Gasoline Engine
− 2 years or 24,000 miles, and 8 years or
State and Federal agencies may require a different 80,000 miles for the catalytic converter
emission control system warranty for chassis or vehicle, powertrain control module,
depending on: whichever comes first.
• Whether the vehicle conforms to regulations • Vehicles with a 8,500 GVWR or greater
applicable to light duty or heavy duty equipped with a Heavy Duty Gasoline Engine
emission control systems
− 5 years or 50,000 miles, whichever
• Whether the vehicle or engine conforms to comes first.
California regulations in addition to U.S. • Vehicles with a 14,000 GVWR or less
Environmental Protection Agency (EPA)
Federal regulations equipped with a Heavy Duty Diesel Engine
− 5 years or 50,000 miles, whichever
To determine eligibility: Light Duty vehicles with a
comes first.
Gross Vehicle Weight Rating (GVWR) of 8,500 lbs.
or less; Heavy Duty vehicles with a GVWR of • Vehicles with a 14,000 GVWR or greater
8,500 lbs. or greater. equipped with a Heavy Duty Diesel Engine
All vehicles are eligible for Federal Emissions − 5 years or 100,000 miles, whichever
Control System Warranty Coverage. If the comes first.
emissions control label contains language stating
the vehicle conforms to California regulations, the
vehicle is also eligible for California Emissions
Control System Warranty Coverage.
4

Downloaded from www.Manualslib.com manuals search engine

 Federal Emission Defect Warranty also be eligible for Emission Performance
Warranty coverage when all of the following
GM warrants to the owner the following:
three conditions are met:
• The vehicle was designed, equipped, and built • The chassis has been maintained and
so as to conform at the time of sale with
operated in accordance with the instructions
applicable regulations of the Federal
for proper maintenance and use set forth in
Environmental Protection Agency (EPA)
the owner manual supplied with the chassis.
• The vehicle is free from defects in materials • The chassis fails an EPA approved I/M test
and workmanship which cause the chassis
during the emission warranty period.
to fail to conform with those regulations during
the emission warranty period • The failure results, or will result, in the owner
of the chassis having to bear a penalty or
Emission related defects in the genuine GM parts other sanctions (including the denial of
listed under the Emission Warranty Parts List the right to use the chassis) under local,
covered, including related diagnostic costs, parts, state, or federal law.
and labor are covered by this warranty.
GM warrants that your dealer will replace, repair,
Federal Emission Performance Warranty or adjust to GM specifications, at no charge to
Some states and/or local jurisdictions have you, any of the parts listed under the “Emission
established periodic Chassis Inspection and Warranty Parts List” later in this section which
Maintenance (I/M) programs to encourage proper may be necessary to conform to the applicable
maintenance of the chassis. If an EPA approved emission standards. Non-GM parts labeled
I/M program is enforced in your area, you may “Certified to EPA Standards” are covered by
the Federal Emission Performance Warranty.

Downloaded from www.Manualslib.com manuals search engine

 California Emission Control System Your Rights and Obligations
Warranty (For Chassis Subject to California
Exhaust Emission Standards)
This section outlines the emission warranty that GM
provides for the chassis in accordance with the The Emission Control System Warranty on your
California Air Resources Board. Defects in material vehicle is issued in accordance with the California
or workmanship in GM emission parts may also be Air Resources Board and GM. In California, new
covered under the Medium Duty Limited Warranty chassis must be designed, equipped, and built to
coverage. There may be additional coverage on meet the state’s stringent anti-smog standards. GM
GM diesel engine chassis. In any case, the must warrant the chassis emission control system
warranty with the broadest coverage applies. for the periods of time and mileage listed below
provided there has been no abuse, neglect, or
This warranty applies if the chassis meets both of improper maintenance of your chassis. The chassis
the following requirements: emission control system may include parts such as
• The chassis is registered in California or the fuel injection system, ignition system, catalytic
other states adopting California emission converter, and engine computer. Also included are
and warranty regulations*. hoses, belts, connectors, and other emission
• The chassis conforms to California regulations related assemblies.
as indicated on the chassis emission control Where a warrantable condition exists, GM will
label. repair the chassis at no cost to you including
Important: *Massachusetts, Maine, and diagnosis, parts, and labor.
Vermont have California Emissions Control
System Warranty coverage. (New York adopted
California emission standards, but not the California
emissions warranty. The Federal Emissions
Control System warranty applies to all vehicles in
New York.)

Downloaded from www.Manualslib.com manuals search engine

 California Emission Defect and Emission • For 7 years or 70,000 miles, whichever comes
Performance Warranty Coverage first, vehicles with a GVWR of 14,000 lbs.
• For 3 years or 50,000 miles, whichever comes or less:
first, vehicles with a GVWR of 14,000 lbs. − If an emission related part listed in this
or less: booklet specially noted with coverage
For 5 years or 50,000 miles, whichever comes for 7 years or 70,000 miles is defective,
first, gasoline vehicles with a GVWR of GM will repair or replace it. This is
14,000 lbs. or more: your Long-term Emission Control
System Defects Warranty.
For 5 years or 100,000 miles, whichever
comes first, diesel vehicles with a GVWR of • For 8 years or 80,000 miles, whichever comes
14,000 lbs. or more: first, vehicles with a GVWR of 8,500 lbs.
or less:
− If your vehicle fails a smog check
inspection, GM will make all necessary − If the catalytic converter or vehicle,
repairs and adjustments to ensure powertrain, control module is found to
that your vehicle passes the inspection. be defective, GM will repair or replace
This is your Emission Control System it under the Federal Emission Control
Performance Warranty. System Warranty.
− If any emission related part on your Any authorized GM dealer will, as necessary
vehicle is defective, GM will repair under these warranties, replace, repair, or adjust
or replace it. This is your Short-term to GM specifications any genuine GM parts
Emission Defects Warranty. that affect emissions.
The applicable warranty period shall begin on
the date the chassis is delivered to the first retail
purchaser.

Downloaded from www.Manualslib.com manuals search engine

 Owner’s Warranty Responsibilities Emission Warranty Parts List
As the vehicle owner, you are responsible for The emission parts listed here are covered under
the performance of the scheduled maintenance the Emission Control System Warranty. The
listed in your owner manual. GM recommends terms are explained previously in this section
that you retain all maintenance receipts for under Federal Emission Control System Warranty
the chassis, but GM cannot deny warranty and California Emission Control System
coverage solely for the lack of receipts or Warranty.
for your failure to ensure the performance
of all scheduled maintenance. Important: Certain parts may be covered beyond
these warranties if shown with asterisk(s) as
You are responsible for presenting your chassis follows:
to a GM dealer as soon as a problem exists.
The warranted repairs should be completed in a • (*) 7 years/70,000 miles, whichever comes
reasonable amount of time, not to exceed 30 days. first, California Emission Control System
Warranty coverage.
As the vehicle owner, you should also be aware
that GM may deny warranty coverage if your • (**) 8 years/80,000 miles, whichever comes
chassis or a part has failed due to abuse, first, California Emission Control System
neglect, improper or insufficient maintenance, Warranty coverage.
or modifications not approved by GM. The Emission Control Systems Warranties
If you have any questions regarding your rights obligations do not apply to conditions resulting
and responsibilities under these warranties, from tampering, abuse, neglect, or improper
you should contact Customer Assistance Center maintenance; or any other item listed under
at 1-800-222-1020 or, in California, write to: “What Is Not Covered” in the New Vehicle Limited
State of California Air Resources Board Warranty in the warranty booklet. The “Other
Mobile Source Operations Division Terms” presented in the New Vehicle Limited
P.O. Box 8001 Warranty also apply to the emission related
El Monte, CA 91731-2990 warranties.

Downloaded from www.Manualslib.com manuals search engine

 Powertrain Control System Powertrain Control Module (PCM) **
Anti-lock Brake System (ABS) Control Module ** Programmable Read Only Memory (PROM)
Camshaft Position Actuator * Throttle Position Sensor
Camshaft Position Actuator Valve Throttle Position Switch
Coolant Level Sensor Vehicle Control Module (VCM) **
Data Link Connector Vehicle Speed Sensor
Electronic Throttle Control (ETC) Motor Wheel Speed Sensor
Engine Control Module (ECM) * Transmission Controls and Torque
Engine Coolant Temperature Sensor Management
Fast Idle Solenoid IsuzuLAN (CAN) Communications Circuit
Flexible Fuel Sensor * PARK/NEUTRAL Switch
Intake Air Temperature Sensor Torque Converter Clutch Solenoids
Intake Manifold Temperature Sensor Transmission Control Module **
(7.8L Isuzu Diesel) Transmission Fluid Temperature Sensor
Malfunction Indicator Lamp Transmission Gear Selection Switch (Diesel)
Manifold Absolute Pressure Sensor Transmission Internal Mode Switch
Mass Air Flow Sensor Transmission Pressure Control Solenoids 1 & 2
Oil Pressure Sensor (DOD™) Transmission Pressure Switches
Oil Pressure Sensor (7.8L Isuzu Diesel) Transmission Shift Solenoids 1, 2 & 3
Oxygen Sensors Transmission Speed Sensors

Downloaded from www.Manualslib.com manuals search engine

 Fuel Management System Air Management System
®
Common Rail Assembly (6.6L DURAMAX Air Cleaner
Diesel) * Air Cleaner Diaphragm Isuzu Motor
Common Rail Assembly (7.8L Isuzu Diesel) Air Cleaner Resonator
Diesel Fuel Injection Pump * Air Cleaner Temperature Compensator Valve
Diesel Fuel Injection Pump Timing Adjust Air Intake Ducts
Diesel Fuel Injector Control Module – EDU Charge Air Control Actuator
(6.6L DURAMAX® Diesel) *
Charge Air Control Solenoid Valve
Diesel Fuel Temperature Sensor
Charge Air Control Valve
Direct Fuel Injector Assembly (6.6L DURAMAX®
Diesel) * Charge Air Cooler (6.6L DURAMAX® Diesel) *
Function Block (6.6L DURAMAX® Diesel) Charge Air Cooler (7.8L Isuzu Diesel) *
Fuel Injector Charge Air Cooler Fan
Fuel Pressure Regulator Idle Air Control Valve
Fuel Rail Assembly * Idle Speed Control Motor
Fuel Rail Pressure Sensor (6.6L DURAMAX ® Intake Manifold *
Diesel) Intake Manifold Gasket (7/70 only Terraza,
Fuel Rail Pressure Sensor (7.8L Isuzu Diesel) Uplander, Montana SV6, RELAY, & DURAMAX®
Diesel) *

10

Downloaded from www.Manualslib.com manuals search engine

 Intake Manifold Gasket (7.8L Isuzu Diesel) * Ignition System
Intake Manifold Heater Camshaft Position Sensor(s)
Intake Manifold Tuning Valve Crankshaft Position Sensor(s)
Intake Manifold Tuning Valve Relay Distributor
Supercharger Assembly * Distributor Cap
Throttle Body * (Replacement Only) Distributor Pick Up Coil
Throttle Body Heater Distributor Rotor
Throttle Closing Dashpot Glow Plug(s) (Diesel)
Turbocharger Assembly * Glow Plug Controller (Diesel)
®
Turbocharger Boost Sensor (6.6L DURAMAX Glow Plug Relay (Diesel)
Diesel) Ignition Coil(s)
Turbocharger Boost Sensor (7.8L Isuzu Diesel) Ignition Control Module
Turbocharger Oil Separator Ignition Timing Adjustment
Turbocharger Thermo Purge Switch Knock Sensor
Vacuum Pump (6.6L DURAMAX® Diesel) Spark Plug Wires
Spark Plugs

11

Downloaded from www.Manualslib.com manuals search engine

 Catalytic Converter System Positive Crankcase Ventilation (PCV) System
Catalytic Converter(s) and Muffler if attached as Oil Filler Cap
assembly ** PCV Filter
Diesel Particulate Filter assembly PCV Oil Separator
(7.8L Isuzu Diesel)
PCV Valve
Exhaust Manifold
(C/K Trucks < 14,000 GVWR 8.1L) Exhaust Gas Recirculation (EGR) System
Exhaust Manifold (7.8L Isuzu Diesel) EGR Feed and Delivery Pipes or Cast-in Passages
Exhaust Manifold with Catalytic Converter if EGR Valve
attached as assembly * EGR Valve Assembly (7.8L Isuzu Diesel)
Exhaust Manifold Gasket EGR Valve Cooler (6.6L DURAMAX® Diesel)
Exhaust Pipes and/or Mufflers (when located EGR Cooler (7.8L Isuzu Diesel)
between catalytic converters and exhaust
manifold) EGR Vacuum Pump Assembly (6.6L DURAMAX®
Diesel)
Exhaust Pipes and/or Mufflers (when located
between catalytic converters and exhaust Secondary Air Injection System
manifold - 7.8L Isuzu Diesel) Air Pump
Exhaust Throttle (7.8L Isuzu Diesel) Check Valves

12

Downloaded from www.Manualslib.com manuals search engine

 Evaporative Emission Control System Energy Storage Control Module *
(Gasoline Engines) IsuzuLAN (CAN) Communications Circuit
Canister Hood Ajar Switch and Circuit
Canister Purge Solenoid Valve Hybrid Control Module **
Canister Vent Solenoid SGCM Coolant Circuit (fan and fan relay
Fuel Feed and Return Pipes and Hoses and pump)
Fuel Filler Cap Starter Generator Control Module *
Fuel Level Sensor Wheel Speed Sensor and Circuits
Fuel Limiter Vent Valve * (left and right front)
Fuel Tank Filler Pipe (with restrictor) Miscellaneous Items Used with Above
Components are Covered
Fuel Tank(s) *
Belts
Fuel Tank Vacuum or Pressure Sensor
Boots
Hybrid
Clamps
Auxiliary Transmission Pump, Relay, and Circuit
Connectors
Battery Pack Current Sensor and Circuit
Ducts
Battery Pack 12V Modules (3)
Brake Pedal Switch (PCM ZAB Switch)

13

Downloaded from www.Manualslib.com manuals search engine

 Fittings Replacement Parts
Gaskets The emission control systems of your chassis
Grommets were designed, built, and tested using genuine GM
parts* and the chassis is certified as being in
Hoses conformity with applicable federal and California
Housings emission requirements. Accordingly, it is
recommended that any replacement parts used
Mounting Hardware
for maintenance or for the repair of emission
Pipes control systems be new, genuine GM parts.
Pulleys The warranty obligations are not dependent upon
Sealing Devices the use of any particular brand of replacement
parts. The owner may elect to use non-genuine
Springs GM parts for replacement purposes. Use of
Tubes replacement parts which are not of equivalent
quality may impair the effectiveness of emission
Wiring control systems.
Parts specified in your maintenance schedule that If other than new, genuine GM parts are used for
require scheduled replacement are covered up maintenance replacements or for the repair of parts
to their first replacement interval or the applicable affecting emission control, the owner should assure
emission warranty coverage period, whichever himself/herself that such parts are warranted by
comes first. If failure of one of these parts results their manufacturer to be equivalent to genuine GM
in failure of another part, both will be covered parts in performance and durability.
under the Emission Control System Warranty.
* “Genuine GM parts,” when used in connection
For detailed information concerning specific parts with GM chassis means parts manufactured by or
covered by these emission control systems for GM, designed for use on GM chassis, and
warranties, ask your dealer. distributed by any division or subsidiary of GM.
14

Downloaded from www.Manualslib.com manuals search engine

 Maintenance and Repairs If, in an emergency situation, it is necessary to
have repairs performed by other than a GM dealer
Maintenance and repairs can be performed by and you believe the repairs are covered by
any qualified service outlet; however, warranty emission warranties, take the replaced parts and
repairs must be performed by an authorized your receipt to a GM dealer for reimbursement
dealer except in an emergency situation when consideration. This applies to both the Federal
a warranted part or a warranty station is not Emission Defect Warranty and Federal Emission
reasonably available to the chassis owner. Performance Warranty.
In an emergency, where an authorized dealer is Receipts and records covering the performance
not reasonably available, repairs can be performed of regular maintenance or emergency repairs
at any available service establishment or by the should be retained in the event questions arise
owner, using any replacement part. GM will concerning maintenance. These receipts and
consider reimbursement for the expense records should be transferred to each subsequent
incurred (including diagnosis), not to exceed owner. GM will not deny warranty coverage
the manufacturer’s suggested retail price for all solely on the absence of maintenance records.
warranted parts replaced and labor charges based However, GM may deny a warranty claim if
on GM’s recommended time allowance for the a failure to perform scheduled maintenance
warranty repair and the geographically appropriate resulted in the failure of a warranty part.
labor rate. A part not being available within
10 days or a repair not being completed within
30 days constitutes an emergency. Retain receipts
and failed parts in order to receive compensation
for warranty repairs reimbursable due to an
emergency.

15

Downloaded from www.Manualslib.com manuals search engine

 Claims Procedure In the event a warranty matter is not handled
to your satisfaction, refer to the “Customer
As with the other warranties covered in the Satisfaction Procedure” in the warranty booklet
separate warranty booklet, take your chassis to under “Owner Assistance”.
any authorized GM dealer facility to obtain service
under the emission warranty. This should be done For further information or to report violations of the
as soon as possible after failing an EPA-approved Emission Control System Warranty, contact the
I/M test or a California smog check test, or at any EPA at:
time you suspect a defect in a part. Manager, Certification and Compliance
Those repairs qualifying under the warranty will Division (6405J)
be performed by any GM dealer at no charge. Warranty Claims
Repairs which do not qualify will be charged to Environmental Protection Agency
Ariel Rios Building
you. You will be notified as to whether or not
1200 Pennsylvania Avenue, N.W.
the repair qualifies under the warranty within a Washington, DC 20460
reasonable time (not to exceed 30 days after
receipt of the chassis by the dealer, or within For a chassis subject to the California Exhaust
the time period required by local or state law). Emission Standards, contact:
The only exceptions would be if you request State of California Air Resources Board
or agree to an extension, or if a delay results Mobile Source Operations Division
from events beyond the control of your dealer P.O. Box 8001
or GM. If you are not so notified, GM will provide El Monte, CA 91731-2990
any required repairs at no charge.

16

Downloaded from www.Manualslib.com manuals search engine

 How to Use This Manual
Many people read the owner manual from {CAUTION:
beginning to end when they first receive their
new vehicle to learn about the vehicle’s features These mean there is something that could
and controls. Pictures and words work together to hurt you or other people.
explain things.
We tell you what the hazard is and what to do
Index to help avoid or reduce the hazard. Please read
A good place to quickly locate information about these cautions. If you do not, you or others
the vehicle is the Index in the back of the manual. could be hurt.
It is an alphabetical list of what is in the manual
and the page number where it can be found. A circle with a slash
through it is a safety
symbol which means
Safety Warnings and Symbols “Do Not,” “Do Not
There are a number of safety cautions in this do this” or “Do Not
book. A box with the word CAUTION is used to let this happen.”
tell about things that could hurt you or others if you
were to ignore the warning.

17

Downloaded from www.Manualslib.com manuals search engine

 Vehicle Damage Warnings Vehicle Symbols
You will also find notices in this manual. The vehicle has components and labels that use
symbols instead of text. Symbols are shown
Notice: These mean there is something that along with the text describing the operation or
could damage your vehicle. information relating to a specific component,
A notice tells about something that can damage control, message, gage, or indicator.
the vehicle. Many times, this damage would not be If you need help figuring out a specific name of
covered by your vehicle’s warranty, and it could a component, gage, or indicator, reference
be costly. The notice tells what to do to help avoid the following topics:
the damage.
• Seats and Restraint Systems in Section 1
When you read other manuals, you might see
CAUTION and NOTICE warnings in different colors • Features and Controls in Section 2
or in different words. • Instrument Panel Overview in Section 3
There are also warning labels on the vehicle • Climate Controls in Section 3
which use the same words, CAUTION or NOTICE. • Warning Lights, Gages, and Indicators in
Section 3
• Audio System(s) in Section 3
• Engine Compartment Overview in Section 5

18

Downloaded from www.Manualslib.com manuals search engine

 These are some examples of symbols that may be found on the vehicle:

19

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

20

Downloaded from www.Manualslib.com manuals search engine

 Section 1 Seats and Restraint Systems
Front Seats ................................................... 22 Child Restraints ............................................ 43
Manual Seats .............................................. 22 Older Children ............................................. 43
Manual Lumbar ........................................... 23 Infants and Young Children ......................... 46
Reclining Seatbacks .................................... 24 Child Restraint Systems .............................. 50
Air Suspension Seats .................................. 26 Lower Anchors and Tethers for
Center Seat ................................................ 27 Children (LATCH) .................................... 54
Safety Belts .................................................. 28 Securing a Child Restraint in Your
Safety Belts: They Are for Everyone ........... 28 Medium Duty Vehicle ............................... 55
Questions and Answers About Restraint System Check ............................... 56
Safety Belts ............................................. 32 Checking the Restraint Systems .................. 56
How to Wear Safety Belts Properly ............. 32 Replacing Restraint System Parts
Driver Position ............................................. 33 After a Crash ........................................... 57
Shoulder Belt Height Adjustment ................. 40
Safety Belt Use During Pregnancy .............. 41
Right Passenger Position ............................ 41
Center Passenger Position .......................... 42
Safety Belt Extender ................................... 43

21

Downloaded from www.Manualslib.com manuals search engine

 Front Seats
{CAUTION:
Manual Seats
You can lose control of the vehicle if you
Your vehicle has bucket
seats. You can adjust try to adjust a manual driver’s seat while
the driver’s seat the vehicle is moving. The sudden
with these levers movement could startle and confuse you,
located at the front or make you push a pedal when you do
of the seat. not want to. Adjust the driver’s seat only
when the vehicle is not moving.

22

Downloaded from www.Manualslib.com manuals search engine

 Slide lever (A) to the left to unlock the seat and Manual Lumbar
slide the seat to where you want it. Release
the lever and try to move the seat with your
body to make sure the seat is locked into place.
To adjust the lower seat cushion forward or
backward, pull up on lever (B) and slide the
cushion to where you want it. Then release
the lever.

To get more support in the lumbar area of your

back, turn the lumbar adjustment knob. The knob
is located on the inboard side of the driver’s
seatback and the outboard side of the passenger’s
seatback.

23

Downloaded from www.Manualslib.com manuals search engine

 Reclining Seatbacks

{CAUTION:
You can lose control of the vehicle if you
try to adjust a manual driver’s seat while
the vehicle is moving. The sudden
movement could startle and confuse you,
or make you push a pedal when you do
not want to. Adjust the driver’s seat only
when the vehicle is not moving.
To tilt the seatback, turn the reclining knob. The
knob is located on the outboard side of both seats.

24

Downloaded from www.Manualslib.com manuals search engine

 {CAUTION:
Sitting in a reclined position when your
vehicle is in motion can be dangerous.
Even if you buckle up, your safety belts
cannot do their job when you are reclined
like this.
The shoulder belt cannot do its job. In a
crash, you could go into it, receiving neck
or other injuries.
The lap belt cannot do its job either. In a
crash the belt could go up over your
abdomen. The belt forces would be there,
not at your pelvic bones. This could cause
serious internal injuries.
For proper protection when the vehicle is
in motion, have the seatback upright.
Then sit well back in the seat and wear
your safety belt properly.

Do not have a seatback reclined if the vehicle is

moving.

25

Downloaded from www.Manualslib.com manuals search engine

 Air Suspension Seats Isolator Lock Lever
Your vehicle may have an air suspension seat. The lever is located on
There are two ways you can adjust the seat. the inboard side of the
Height Adjustment driver’s seat.

The height adjustment

is controlled by the air
suspension valve. The
lever for the valve is
located on the outboard
side of the driver’s seat.

Lever shown in the

Locked Position

Move the handle down to lock the seat in place.

Pull the lever up to raise the seat. Push the lever This is used to reduce backslap experienced while
down to lower the seat. in tractor/trailer operation or while operating a
dump truck.

26

Downloaded from www.Manualslib.com manuals search engine

 Center Seat
Your vehicle may have a center seat. {CAUTION:
To fold the seatback down, pull the lever, located
on the right side of the seat. If the seatback is not locked, it could
move forward in a sudden stop or crash.
Then lower the seatback forward and push down That could cause injury to the person
firmly to lock in position. A storage compartment
sitting there. Always push and pull on
is located on the rear of the seatback for use when
the seatback is in the fully lowered position. the seatback to be sure it is locked.

Push the lever on the right side of the seat and

pull on the seatback when you are ready to raise it.

27

Downloaded from www.Manualslib.com manuals search engine

 Safety Belts
{CAUTION:
Safety Belts: They Are for Everyone
It is extremely dangerous to ride in a
This part of the manual tells you how to use
cargo area, inside or outside of a vehicle.
safety belts properly. It also tells you some things
you should not do with safety belts. In a collision, people riding in these areas
are more likely to be seriously injured or
killed. Do not allow people to ride in any
{CAUTION: area of your vehicle that is not equipped
with seats and safety belts. Be sure
Do not let anyone ride where he or she everyone in your vehicle is in a seat
cannot wear a safety belt properly. If you and using a safety belt properly.
are in a crash and you are not wearing a
safety belt, your injuries can be much
Your vehicle has a light
worse. You can hit things inside the
that comes on as a
vehicle or be ejected from it. You can be reminder to buckle up.
seriously injured or killed. In the same See Safety Belt
crash, you might not be, if you are Reminder Light on
buckled up. Always fasten your safety page 121.
belt, and check that your passengers’
belts are fastened properly too.

28

Downloaded from www.Manualslib.com manuals search engine

 In most states and in all Canadian provinces, Why Safety Belts Work
the law says to wear safety belts. Here is
why: They work.
Q: Aren’t safety belts for kids?
You never know if you will be in a crash. If you
do have a crash, you do not know if it will be a A: Yes. And they are for adult truckers, and
bad one. anyone else who rides in your vehicle.
A few crashes are mild, and some crashes can
be so serious that even buckled up, a person
would not survive. But most crashes are in
between. In many of them, people who buckle up
can survive and sometimes walk away. Without
belts they could have been badly hurt or killed.
After more than 40 years of safety belts in
vehicles, the facts are clear. In most crashes
buckling up does matter... a lot!

Here is why: when your vehicle goes, say, 30 mph

(50 km/h), so do you and your passengers.

29

Downloaded from www.Manualslib.com manuals search engine

 If the vehicle hits something, it stops – right then. Then something will stop them. It could be the
But nothing stops the people. They keep moving. windshield.

30

Downloaded from www.Manualslib.com manuals search engine

 Or it could be the instrument panel. With safety belts, you slow down as the vehicle
Now, what if you and your passengers were to does. You get more time to stop.
give that big vehicle a chance to deal with You stop over more distance, and your strongest
the force of the impact, instead of you? bones take the forces. Safety belts are for
everyone.

31

Downloaded from www.Manualslib.com manuals search engine

 Questions and Answers About Most accidents occur within 25 miles (40 km)
of home. And the greatest number of serious
Safety Belts injuries and deaths occur at speeds of less than
40 mph (65 km/h).
Q: Will I be trapped in the vehicle after an Safety belts are for everyone.
accident if I am wearing a safety belt?
A: You could be — whether you are wearing a How to Wear Safety Belts Properly
safety belt or not. But you can unbuckle a
safety belt, even if you are upside down. This part is only for people of adult size.
And your chance of being conscious during Be aware that there are special things to know
and after an accident, so you can unbuckle about safety belts and children. And there are
and get out, is much greater if you are belted. different rules for smaller children and babies.
If a child will be riding in your vehicle, see Older
Children on page 43 or Infants and Young Children
Q: If I am a good driver, and I never drive far on page 46. Follow those rules for everyone’s
from home, why should I wear safety belts?
protection.
A: You may be an excellent driver, but if you are First, you will want to know which restraint
in an accident — even one that is not your systems your vehicle has.
fault — you and your passengers can be hurt.
Being a good driver does not protect you We will start with the driver position.
from things beyond your control, such as
bad drivers.

32

Downloaded from www.Manualslib.com manuals search engine

 Driver Position The lap-shoulder belt may lock if you pull the
belt across you very quickly. If this happens,
Lap-Shoulder Belt let the belt go back slightly to unlock it.
Then pull the belt across you more slowly.
The driver has a lap-shoulder belt. Here is how to There is a clip on the lap portion of the
wear it properly. lap-shoulder belt. Make sure this clip is
1. Close and lock the door. not too close to the latch plate when you
2. Adjust the seat so you can sit up straight. wear your safety belt, so you can make the
To see how, see “Seats” in the Index. belt snug.
4. Push the latch plate into the buckle until
it clicks.
Pull up on the latch plate to make sure it
is secure. If the belt is not long enough,
see Safety Belt Extender on page 43.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle
the safety belt quickly if you ever had to.
5. Move the shoulder belt height adjuster to the
height that is right for you. Improper shoulder
belt height adjustment could reduce the
effectiveness of the safety belt in a crash. See
Shoulder Belt Height Adjustment on page 40.
3. Pick up the latch plate and pull the belt across
you. Do not let it get twisted.

33

Downloaded from www.Manualslib.com manuals search engine

 6. To make the lap part tight, pull up on the
shoulder belt.
It may be necessary to pull stitching on the The lap part of the belt should be worn low and
safety belt through the latch plate to fully snug on the hips, just touching the thighs. In a
tighten the lap belt on smaller occupants. crash, this applies force to the strong pelvic bones.
And you would be less likely to slide under the lap
belt. If you slid under it, the belt would apply force at
your abdomen. This could cause serious or even
fatal injuries. The shoulder belt should go over the
shoulder and across the chest. These parts of the
body are best able to take belt restraining forces.
The safety belt locks if there is a sudden stop
or crash.
34

Downloaded from www.Manualslib.com manuals search engine

 Q: What is wrong with this?
{CAUTION:
You can be seriously hurt if your shoulder
belt is too loose. In a crash, you would
move forward too much, which could
increase injury. The shoulder belt should
fit against your body.

A: The shoulder belt is too loose. It will not give

nearly as much protection this way.

35

Downloaded from www.Manualslib.com manuals search engine

 Q: What is wrong with this?
{CAUTION:
You can be seriously hurt if your lap belt
is too loose. In a crash, you could slide
under the lap belt and apply force at your
abdomen. This could cause serious or
even fatal injuries. The lap belt should be
worn low and snug on the hips, just
touching the thighs.

A: The lap belt is too loose. It will not give nearly

as much protection this way.

36

Downloaded from www.Manualslib.com manuals search engine

 Q: What is wrong with this?
{CAUTION:
You can be seriously injured if your belt is
buckled in the wrong place like this. In a
crash, the belt would go up over your
abdomen. The belt forces would be there,
not at the pelvic bones. This could cause
serious internal injuries. Always buckle
your belt into the buckle nearest you.

A: The belt is buckled in the wrong place.

37

Downloaded from www.Manualslib.com manuals search engine

 Q: What is wrong with this?
{CAUTION:
You can be seriously injured if you wear
the shoulder belt under your arm. In a
crash, your body would move too far
forward, which would increase the chance
of head and neck injury. Also, the belt
would apply too much force to the ribs,
which are not as strong as shoulder
bones. You could also severely injure
internal organs like your liver or spleen.

A: The shoulder belt is worn under the arm.

It should be worn over the shoulder at
all times.

38

Downloaded from www.Manualslib.com manuals search engine

 Q: What is wrong with this?
{CAUTION:
You can be seriously injured by a twisted
belt. In a crash, you would not have the full
width of the belt to spread impact forces.
If a belt is twisted, make it straight so it can
work properly, or ask your dealer/retailer to
fix it.

A: The belt is twisted across the body.

39

Downloaded from www.Manualslib.com manuals search engine

 Shoulder Belt Height Adjustment
Before you begin to drive, move the shoulder belt
height adjuster to the height that is right for you.
Adjust the height so that the shoulder portion
of the belt is centered on your shoulder. The belt
should be away from your face and neck, but
not falling off your shoulder. Improper shoulder belt
height adjustment could reduce the effectiveness
of the safety belt in a crash.

To move it down, press

in at the top of the
arrows and move the
To unlatch the belt, push the button on the buckle. height adjuster to
The belt should go back out of the way. the desired position.
Before you close the door, be sure the belt is out You can move the
of the way. If you slam the door on it, you can height adjuster up just
damage both the belt and your vehicle. by pushing up on
the shoulder belt guide.

After you move the height adjuster to where you

want it, try to move it down without pressing
in to make sure it has locked into position.

40

Downloaded from www.Manualslib.com manuals search engine

 Safety Belt Use During Pregnancy The best way to protect the fetus is to protect
the mother. When a safety belt is worn properly,
Safety belts work for everyone, including pregnant it is more likely that the fetus will not be hurt
women. Like all occupants, they are more likely in a crash. For pregnant women, as for anyone,
to be seriously injured if they do not wear the key to making safety belts effective is wearing
safety belts. them properly.

Right Passenger Position

The right passenger’s safety belt works the
same way as the driver’s safety belt. See Driver
Position on page 33.

A pregnant woman should wear a lap-shoulder

belt, and the lap portion should be worn as low
as possible, below the rounding, throughout
the pregnancy.

41

Downloaded from www.Manualslib.com manuals search engine

 Center Passenger Position
Lap Belt
If your vehicle has a center seat, someone can sit
in the center position.

To make the belt shorter, pull its free end as

shown until the belt is snug.
Buckle, position and release it the same way as
the lap part of a lap-shoulder belt. If the belt is
not long enough, see Safety Belt Extender
on page 43.
When you sit in a center seating position, you
have a lap safety belt, which has no retractor. Make sure the release button on the buckle is
To make the belt longer, tilt the latch plate and positioned so you would be able to unbuckle the
pull it along the belt. safety belt quickly if you ever had to.

42

Downloaded from www.Manualslib.com manuals search engine

 Safety Belt Extender Child Restraints
If the vehicle’s safety belt will fasten around you,
you should use it. Older Children
But if a safety belt is not long enough, your
dealer/retailer will order you an extender. When
you go in to order it, take the heaviest coat you
will wear, so the extender will be long enough for
you. To help avoid personal injury, do not let
someone else use it, and use it only for the seat it
is made to fit. The extender has been designed
for adults. Never use it for securing child seats.
To wear it, attach it to the regular safety belt.
For more information, see the instruction sheet
that comes with the extender.

Older children who have outgrown booster seats

should wear the vehicle’s safety belts.
If you have the choice, a child should sit next to
a window so the child can wear a lap-shoulder belt
and get the additional restraint a shoulder belt
can provide.

43

Downloaded from www.Manualslib.com manuals search engine

 Q: What is the proper way to wear safety
belts?
A: If possible, an older child should wear a
lap-shoulder belt and get the additional
restraint a shoulder belt can provide.
The shoulder belt should not cross the face
or neck. The lap belt should fit snugly
below the hips, just touching the top of the
thighs. It should never be worn over the
abdomen, which could cause severe or
even fatal internal injuries in a crash.
According to accident statistics, children are safer
when properly restrained in the rear seating
positions than in the front seating positions.
In a crash, children who are not buckled up can
{CAUTION:
strike other people who are buckled up, or can be
thrown out of the vehicle. Older children need Never do this.
to use safety belts properly. Here two children are wearing the same
belt. The belt cannot properly spread the
impact forces. In a crash, the two children
can be crushed together and seriously
injured. A belt must be used by only one
person at a time.

44

Downloaded from www.Manualslib.com manuals search engine

 Q: What if a child is wearing a lap-shoulder
belt, but the child is so small that the {CAUTION:
shoulder belt is very close to the child’s
face or neck?
Never do this.
A: Move the child toward the center of the
vehicle, but be sure that the shoulder belt still Here a child is sitting in a seat that has a
is on the child’s shoulder, so that in a crash lap-shoulder belt, but the shoulder part is
the child’s upper body would have the restraint behind the child. If the child wears the
that belts provide. belt in this way, in a crash the child might
If the child is so small that the shoulder belt is slide under the belt. The belt’s force
still very close to the child’s face or neck, you would then be applied right on the child’s
might want to place the child in a seat that has abdomen. That could cause serious or
a lap belt, if your vehicle has one. fatal injuries.

Wherever the child sits, the lap portion of the belt

should be worn low and snug on the hips, just
touching the child’s thighs. This applies belt force
to the child’s pelvic bones in a crash.

45

Downloaded from www.Manualslib.com manuals search engine

 Infants and Young Children
Everyone in a vehicle needs protection! {CAUTION:
This includes infants and all other children.
Neither the distance traveled nor the age and Children can be seriously injured or
size of the traveler changes the need, for strangled if a shoulder belt is wrapped
everyone, to use safety restraints. In fact, around their neck and the safety belt
the law in every state in the United States and continues to tighten. Never leave children
in every Canadian province says children up unattended in a vehicle and never allow
to some age must be restrained while in a vehicle.
children to play with the safety belts.

Every time infants and young children ride in

vehicles, they should have the protection provided
by appropriate restraints. Young children should
not use the vehicle’s adult safety belts alone,
unless there is no other choice. Instead, they
need to use a child restraint.

46

Downloaded from www.Manualslib.com manuals search engine

 {CAUTION:
People should never hold a baby in their
arms while riding in a vehicle. A baby does
not weigh much — until a crash. During a
crash a baby will become so heavy it is not
possible to hold it. For example, in a crash
at only 25 mph (40 km/h), a 12 lb (5.5 kg)
baby will suddenly become a 240 lb
(110 kg) force on a person’s arms. A baby
should be secured in an appropriate
restraint.

47

Downloaded from www.Manualslib.com manuals search engine

 Q: What are the different types of add-on
child restraints? {CAUTION:
A: Add-on child restraints, which are purchased by
the vehicle’s owner, are available in four basic Newborn infants need complete support,
types. Selection of a particular restraint should including support for the head and neck.
take into consideration not only the child’s This is necessary because a newborn
weight, height, and age but also whether or not infant’s neck is weak and its head weighs
the restraint will be compatible with the motor so much compared with the rest of its
vehicle in which it will be used. body. In a crash, an infant in a rear-facing
For most basic types of child restraints, there seat settles into the restraint, so the crash
are many different models available. When forces can be distributed across the
purchasing a child restraint, be sure it is strongest part of an infant’s body, the
designed to be used in a motor vehicle. If it is, back and shoulders. Infants always
the restraint will have a label saying that it should be secured in appropriate infant
meets federal motor vehicle safety standards. restraints.
The restraint manufacturer’s instructions that
come with the restraint state the weight and
height limitations for a particular child restraint.
In addition, there are many kinds of restraints
available for children with special needs.

48

Downloaded from www.Manualslib.com manuals search engine

 {CAUTION:
The body structure of a young child is
quite unlike that of an adult or older child,
for whom the safety belts are designed. A
young child’s hip bones are still so small
that the vehicle’s regular safety belt may
not remain low on the hip bones, as it
should. Instead, it may settle up around
the child’s abdomen. In a crash, the belt
would apply force on a body area that is
unprotected by any bony structure. This
alone could cause serious or fatal injuries.
Young children always should be secured
in appropriate child restraints.

49

Downloaded from www.Manualslib.com manuals search engine

 Child Restraint Systems

A rear-facing infant seat (B) provides restraint

with the seating surface against the back of the
An infant car bed (A), a special bed made for use infant. The harness system holds the infant
in a motor vehicle, is an infant restraint system in place and, in a crash, acts to keep the infant
designed to restrain or position a child on a positioned in the restraint.
continuous flat surface. Make sure that the infant’s
head rests toward the center of the vehicle.

50

Downloaded from www.Manualslib.com manuals search engine

 A forward-facing child seat (C-E) provides restraint A booster seat (F-G) is a child restraint designed
for the child’s body with the harness and also to improve the fit of the vehicle’s safety belt
sometimes with surfaces such as T-shaped system. Some booster seats have a shoulder belt
or shelf-like shields. positioner, and some high-back booster seats
have a five-point harness. A booster seat can
also help a child to see out the window.

51

Downloaded from www.Manualslib.com manuals search engine

 Q: How Should I Use a Child Restraint? Securing an Add-on Child Restraint in
A: A child restraint system is any device designed the Vehicle
for use in a motor vehicle to restrain, seat,
or position children. A built-in child restraint
system is a permanent part of the motor {CAUTION:
vehicle. An add-on child restraint system is
a portable one, which is purchased by the A child can be seriously injured or killed
vehicle’s owner. To help reduce injuries, an in a crash if the child restraint is not
add-on child restraint must be secured in the properly secured in the vehicle. Make sure
vehicle. With built-in or add-on child restraints, the child restraint is properly installed in
the child has to be secured within the child the vehicle using the vehicle’s safety belt,
restraint. following the instructions that came with
When choosing an add-on child restraint, that restraint, and also the instructions in
be sure the child restraint is designed to this manual.
be used in a vehicle. If it is, it will have a
label saying that it meets federal motor vehicle To help reduce the chance of injury, the child
safety standards. Then follow the instructions restraint must be secured in the vehicle. Child
for the restraint. You may find these restraint systems must be secured in vehicle seats
instructions on the restraint itself or by lap belts or the lap belt portion of a lap-shoulder
in a booklet, or both. belt. A child can be endangered in a crash if the
child restraint is not properly secured in the
vehicle.

52

Downloaded from www.Manualslib.com manuals search engine

 When securing an add-on child restraint, refer to are attached to a flat pad which rests low against
the instructions that come with the restraint which the child’s body. A shelf- or armrest-type shield has
may be on the restraint itself or in a booklet, or both, straps that are attached to a wide, shelf-like shield
and to this manual. The child restraint instructions that swings up or to the side.
are important, so if they are not available, obtain a
replacement copy from the manufacturer.
Keep in mind that an unsecured child restraint {CAUTION:
can move around in a collision or sudden stop
and injure people in the vehicle. Be sure to A child can be seriously injured or killed
properly secure any child restraint in your in a crash if the child is not properly
vehicle — even when no child is in it. secured in the child restraint. Make sure
Securing the Child Within the Child the child is properly secured, following
the instructions that came with that
Restraint restraint.
There are several systems for securing the
child within the child restraint. One system, the
three-point harness, has straps that come down Because there are different systems, it is important
over each of the infant’s shoulders and buckle to refer to the instructions that come with the
together at the crotch. The five-point harness restraint. A child can be endangered in a crash
system has two shoulder straps, two hip straps, and if the child is not properly secured in the child
a crotch strap. A shield may take the place of hip restraint.
straps. A T-shaped shield has shoulder straps that

53

Downloaded from www.Manualslib.com manuals search engine

 Lower Anchors and Tethers for In Canada, the law requires that forward-facing
child restraints have a top tether, and that
Children (LATCH) the tether be attached.
Some child restraints have a LATCH system. As Your vehicle does not have lower anchors or top
part of the LATCH system, your child restraint may tether anchors to secure a child restraint with
have lower attachments and/or a top tether. The the LATCH system. If a national or local law
LATCH system can help hold the child restraint in requires that your top tether be anchored, do not
place during driving or in a crash. Some vehicles use a child restraint in this vehicle because a
have lower and/or top tether anchors designed top tether cannot be properly anchored. You must
to secure a child restraint with lower attachments use the safety belts to secure your child restraint
and/or a top tether. in this vehicle, unless a national or local law
Some child restraints with a top tether are requires that the top tether be anchored. Refer to
designed to be used whether the top tether is your child restraint instructions and instructions
anchored or not. Other child restraints require that in this manual for securing a child restraint using
the top tether be anchored. A national or local the vehicle’s safety belts.
law may require that the top tether be anchored.

54

Downloaded from www.Manualslib.com manuals search engine

 Securing a Child Restraint in Your the restraint say that the top tether must be
anchored. See Lower Anchors and Tethers for
Medium Duty Vehicle Children (LATCH) on page 54 if the child restraint
We know securing a child can present real has one.
problems in a medium-duty vehicle like yours. The
only place where you can properly secure a child
restraint is the center seating position, the place
that has the lap belt only. But your vehicle may not
have a center seating position. Or, even if you have
one, you may find that the child restraint keeps you
from operating the shift lever or other controls. The
only answer may be to have the smaller children
make the trip in another vehicle, where they can get
to protection they need.
If your vehicle has a center seat, you can secure
a child restraint here.
You will be using the lap belt. Be sure to follow the
instructions that came with the child restraint. 1. Make the belt as long as possible by tilting
Secure the child in the child restraint when and as the latch plate and pulling it along the belt.
the instructions say. But do not use this position if
the child restraint interferes with shifting gears. 2. Put the child restraint on the seat.
There are no top tether anchors in this vehicle. 3. Run the vehicle’s safety belt through or
Do not secure a child seat in this vehicle if a around the restraint. The child restraint
national or local law requires that the top tether instructions will show you how.
be anchored, or if the instructions that come with

55

Downloaded from www.Manualslib.com manuals search engine

 To remove the child restraint, just unbuckle the
vehicle’s safety belt. It will be ready to work for an
adult or larger child passenger.

Restraint System Check

Checking the Restraint Systems
Now and then, make sure the safety belt reminder
light and all your belts, buckles, latch plates,
retractors, and anchorages are working properly.
Look for any other loose or damaged safety
belt system parts. If you see anything that might
keep a safety belt system from doing its job, have
4. Buckle the belt. Make sure the release button
it repaired. See Care of Safety Belts on page 270
is positioned so you would be able to unbuckle
for more information.
the safety belt quickly if you ever had to.
5. To tighten the belt, pull its free end while you Torn or frayed safety belts may not protect you in
push down on the child restraint. If you are a crash. They can rip apart under impact forces.
using a forward-facing child restraint, you may If a belt is torn or frayed, get a new one right away.
find it helpful to use your knee to push down
on the child restraint as you tighten the belt.
6. Push and pull the child restraint in different
directions to be sure it is secure.

56

Downloaded from www.Manualslib.com manuals search engine

 Replacing Restraint System Parts If you have had a crash, do you need new belts?
After a Crash After a very minor collision, nothing may be
necessary. But if the belts were stretched, as they
would be if worn during a more severe crash,
then you need new parts.
{CAUTION:
If belts are cut or damaged, replace them.
A crash can damage the restraint systems Collision damage also may mean you will need
to have safety belt or seat parts repaired or
in your vehicle. A damaged restraint
replaced. New parts and repairs may be necessary
system may not properly protect the even if the belt was not being used at the time
person using it, resulting in serious injury of the collision.
or even death in a crash. To help make
sure your restraint systems are working
properly after a crash, have them inspected
and any necessary replacements made as
soon as possible.

57

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

58

Downloaded from www.Manualslib.com manuals search engine

 Section 2 Features and Controls
Keys .............................................................. 60 Automatic Transmission Operation ............... 76
Doors and Locks .......................................... 61 Automatic Transmission Third-Gear Hold ..... 77
Door Locks ................................................. 61 Manual Transmission Operation ................... 77
Power Take-Off (PTO) ................................. 79
Windows ....................................................... 62 Parking ....................................................... 80
Power Windows .......................................... 63
Parking Brake (With Hydraulic Brakes) ........ 81
Passenger Side Door Glass ........................ 64
Parking Brake (With Air Brakes) .................. 82
Starting and Operating Your Vehicle ........... 65 Parking Brake Burnish Procedure ................ 85
New Vehicle Break-In .................................. 65 Air Suspension ............................................ 85
Ignition Positions ......................................... 66 Parking Over Things That Burn ................... 86
Starting the Diesel Engine ........................... 66 Engine Exhaust ........................................... 86
Engine Alarm and Automatic Shutdown ....... 69 Diesel Particulate Filter ................................ 87
High Idle System ......................................... 70 Running the Engine While Parked ............... 92
Exhaust Restrictor ....................................... 70 Mirrors ........................................................... 93
Engine Checks Before Operating ................. 71 Outside Manual Mirrors ............................... 93
Engine Coolant Heater ................................ 73
Outside Convex Mirrors ............................... 93
Diesel Engine Exhaust Brake ...................... 74
Outside Heated Mirrors ............................... 94
Two-Speed Rear Axle
Electric Shift Control ................................ 75 Storage Areas ............................................... 94
Center Console Storage Area ...................... 95

59

Downloaded from www.Manualslib.com manuals search engine

 Keys

{CAUTION:
Leaving children in a vehicle with the
ignition key is dangerous for many
reasons, children or others could be badly
injured or even killed. They could operate
the power windows or other controls or
even make the vehicle move. The windows
will function with the keys in the ignition
and they could be seriously injured or
killed if caught in the path of a closing
window. Do not leave the keys in a vehicle
with children. The key can be used for the ignition switch and
all locks.
The key has a code on it that tells your
dealer/retailer or a qualified locksmith how to
make extra keys. Record and keep the key code
in a safe place. If the key is lost, you can have
a new one made using this code.
Notice: If you ever lock your keys in your
vehicle, you may have to damage the vehicle
to get in. Be sure you have spare keys.
60

Downloaded from www.Manualslib.com manuals search engine

 Doors and Locks
CAUTION: (Continued)
Door Locks
• Outsiders can easily enter through an
unlocked door when you slow down
{CAUTION: or stop your vehicle. Locking your
doors can help prevent this from
Unlocked doors can be dangerous. happening.
• Passengers, especially children, can
easily open the doors and fall out of A manual door lock is located above each door
a moving vehicle. When a door is handle.
locked, the handle will not open it.
You increase the chance of being
thrown out of the vehicle in a crash
if the doors are not locked. So, wear
safety belts properly and lock the
doors whenever you drive.
• Young children who get into unlocked
vehicles may be unable to get out.
A child can be overcome by extreme
heat and can suffer permanent injuries
or even death from heat stroke.
Always lock your vehicle whenever
you leave it.
To lock your door from the inside, push the manual
CAUTION: (Continued) lock in. To unlock the door, pull the manual lock out.

61

Downloaded from www.Manualslib.com manuals search engine

 When the doors are locked, they can’t be opened
using the inside handles until the manual lock
is pulled out.

Windows

{CAUTION:
Leaving children, helpless adults, or pets
in a vehicle with the windows closed is
dangerous. They can be overcome by
the extreme heat and suffer permanent
injuries or even death from heat stroke.
Never leave a child, a helpless adult, or a
pet alone in a vehicle, especially with the
windows closed in warm or hot weather.

62

Downloaded from www.Manualslib.com manuals search engine

 Power Windows Power Window Lock Switch
Pressing the power window lock switch once locks
If your vehicle has the passenger side window and prevents it from
power windows, the opening or closing. Pressing the switch a second
switches for both time unlocks the passenger side window.
windows are located
on the driver’s door. In Express-Down
addition, the passenger
door has a switch The driver’s window has an express-down
for its own window. feature. This allows the window to be lowered
fully without continuously holding the switch. Press
the switch down fully to initiate the express-down
feature. Press the top of the switch to stop
the window from lowering.
Press the rearward part of the switch to lower the
window. Press the forward part of the switch to
raise the window.
The power windows will operate when the ignition
is in ACC or ON.

63

Downloaded from www.Manualslib.com manuals search engine

 Passenger Side Door Glass
{CAUTION:
Never open the passenger side door glass
with the ignition on. You can be injured if
the window linkage moves. Open this
glass only with the ignition off.

To open the window cover, pull on the latch at the

rear of the window and swing the window cover
open. When closing the window cover, push firmly
at the latch to close completely.

If your vehicle has this feature, the cover on the

passenger’s side lower window will open so
that the glass can be cleaned.

64

Downloaded from www.Manualslib.com manuals search engine

 Starting and Operating Your • Use the lowest gear you can when you
start a loaded vehicle in motion and
Vehicle when going up hills to avoid overloading
the engine.
New Vehicle Break-In • Check and adjust engine and transmission
fluid levels often and be sure tires are
Notice: Your vehicle does not need an properly inflated for the load you are
elaborate break-in. But it will perform better in carrying.
the long run if you follow these guidelines:
• When new, parking brake linings have not
• Let the engine warm up before you operate yet been broken in. When linings are new,
your vehicle under load. it is possible that the vehicle could move
• Keep your speed at 55 mph (88 km/h) or while the parking brake is applied. Before
less for the first 500 miles (805 km). using the parking brake on grades, follow
• Do not drive at any one speed, fast or the parking brake burnish procedure.
slow, for the first 500 miles (805 km). See Parking Brake Burnish Procedure
Do not make full-throttle starts. on page 85.
• Avoid making hard stops for the first
200 miles (322 km) or so. During this time
the new brake linings are not yet broken
in. Hard stops with new linings can
mean premature wear and earlier
replacement. Follow this breaking-in
guideline every time you get new brake
linings.

65

Downloaded from www.Manualslib.com manuals search engine

 Ignition Positions Key In the Ignition
Never leave your vehicle with the keys inside, as it
Use your ignition key to is an easy target for joy riders or thieves. If you
start your vehicle. You leave the key in the ignition and park your vehicle, a
can turn the ignition chime will sound, when you open the driver’s door.
switch to four different Always remember to remove your key from the
positions. ignition and take it with you. This will lock your
ignition and transaxle. Also, always remember
to lock the doors.
The battery could be drained if you leave the
key in the ignition while your vehicle is parked. You
may not be able to start your vehicle after it has
been parked for an extended period of time.
LOCK: This position allows you to insert and
remove the ignition key.
Starting the Diesel Engine
ACC (Accessory): This position lets you use
accessories when the engine is off. Automatic Transmission
ON: This is the position for driving. Move the shift lever to PARK (P) or NEUTRAL (N).
The engine will not start in any other position – that
The battery could be drained if you leave the key is a safety feature. To restart when the vehicle is
in the ACC or On position with the engine off. already moving, use NEUTRAL (N) only.
You may not be able to start your vehicle if
the battery is allowed to drain for an extended Notice: Do not try to shift to PARK (P) if your
period of time. vehicle is moving. If you do, you could damage
the transmission. Shift to PARK (P) only when
START: This position starts your engine. your vehicle is stopped.
66

Downloaded from www.Manualslib.com manuals search engine

 Manual Transmission When your engine is cold, let it run for a few
minutes before you move your vehicle. This lets
Move the shift lever to NEUTRAL (N) and hold the
oil pressure build up. Your engine will sound louder
clutch pedal to the floor while starting the engine.
when it is cold.
Your vehicle will not start if the clutch pedal is not all
the way down – that is a safety feature. Notice: If you are not in an idling vehicle and
the engine overheats, you would not be there to
Starting Procedure see the overheated engine indication. This
1. Turn your ignition key to ON. could damage your vehicle. Do not let your
Observe the wait to start light. See Wait to engine run when you are not in your vehicle.
Start Indicator on page 129. Cold Weather Starting
This light may not come on if the engine is hot.
The following tips will help you get good starting in
2. As soon as the wait to start light goes off,
cold weather.
immediately turn the ignition key to START.
When the engine starts, let go of the key. Use the recommended engine oil when the
outside temperature drops below freezing.
Notice: Holding your key in START for longer See Engine Oil on page 206. When the outside
than 15 seconds at a time will cause your temperature drops below 0°F (−18°C), use
battery to be drained much sooner. And the of the engine coolant heater is recommended.
excessive heat can damage your starter motor.
See Engine Coolant Heater on page 73 for more
Notice: If the wait to start indicator stays information.
on after starting your vehicle, your vehicle may
See What Fuel to Use on page 195 for information
not run properly. Have your vehicle serviced
on what fuel to use in cold weather.
right away.
3. If the engine does not start after 15 seconds
of cranking, turn the ignition key to LOCK.
Wait one minute for the starter to cool,
then try the same steps again.
67

Downloaded from www.Manualslib.com manuals search engine

 If Your Engine Will Not Start Be sure you have the right oil for your engine,
and that you have changed the oil at the proper
If you are not out of fuel, and your engine will not times. If you use the wrong oil, your engine may be
start, do this: harder to start. See Engine Oil on page 206 for
Turn your ignition key to ON. Immediately after the more information.
wait to start light goes off, turn the ignition key Be sure you are using the proper fuel for existing
to START. weather conditions. See What Fuel to Use on
If the light does not go off, wait a few seconds, page 195 What Fuel to Use.
then try starting your engine again. And, see your If the engine starts, runs a short time, then stops,
dealer/retailer as soon as you can for a starting your vehicle needs service.
system check.
If the light comes on and then goes off and you
know your batteries are charged, but your engine {CAUTION:
still will not start, your vehicle needs service.
If the light does not come on when the engine is Do not use gasoline or starting aids, such
cold, your vehicle needs service. as ether, in the air intake. They could
If your batteries do not have enough charge to damage your engine. There could also be
start your engine, see Battery on page 235 a fire, which could cause serious personal
for more information. injury.

68

Downloaded from www.Manualslib.com manuals search engine

 Engine Alarm and Automatic See Low Coolant Warning Light on page 129 for
more information.
Shutdown
The alarm means that your engine will shut down.
For vehicle with this feature, the check gages light See Engine Shutdown Warning Light on
will come on if the system senses high engine page 132 for more information.
temperature, and a low or high engine oil pressure.
Pull off the road and shut off the engine.
See Check Gages Warning Light on page 134 for
Do not start it until the vehicle is repaired. If the
more information. If a high engine temperature is
engine shuts down while you are still in traffic, the
detected, or if a low or high engine oil pressure is
engine can be restarted for another 25-30 seconds
detected, a tone alarm sounds. The alarm and the
of operation. The engine will not shut down until
light remains on until the condition is fixed. If the
the vehicle speed is less than 5 mph (8 km/h).
engine temperature or oil pressure condition
worsens, the tone alarm increases in frequency. Notice: If you try to operate the vehicle after
If the system senses there is low engine coolant, the engine automatically shuts down, you
the alarm and the low coolant warning light may damage the vehicle. Have your vehicle
comes on. repaired as soon as possible.

69

Downloaded from www.Manualslib.com manuals search engine

 High Idle System The manual high idle feature is activated by
pressing the button on the instrument panel.
Manual High Idle System When the button is pressed again, or any of the
previous conditions are not met, manual high
If your vehicle has this idle will be deactivated.
feature, the manual high
idle button is located Exhaust Restrictor
in the instrument panel.
See Instrument Panel If your vehicle is equipped with this feature,
Overview on page 100 there is an exhaust restrictor valve located in
Instrument Panel the exhaust stream. The valve closes to provide
Overview for more back pressure to the engine for the purpose
information. of warming the engine quickly.
The exhaust restrictor operates:
• while the engine is running.
This system can be used to increase your engine • while the vehicle is not moving.
idle speed whenever the following conditions
are met: • while the accelerator, brake and clutch pedals
are not pressed on a manual transmission
• The brake pedal is not pressed. vehicle.
• The vehicle is at a complete stop. • while idling in cold temperatures.
• The manual transmission clutch pedal is not • when the shift lever is in NEUTRAL (N) or
pressed or, the automatic transmission is in PARK (P) on an automatic transmission
NEUTRAL (N) or PARK (P). vehicle.

70

Downloaded from www.Manualslib.com manuals search engine

 On vehicles equipped with a diesel engine Engine Checks Before Operating
exhaust brake, the exhaust brake switch must
be on. See Diesel Engine Exhaust Brake on When you have started your engine, let it run for
page 74 for more information. The indicator in the 20 to 30 seconds before you put a load on the
exhaust brake switch will be lit when the exhaust engine. But do not leave the vehicle while
restrictor is active. The exhaust brake indicator the engine is running.
light in the center of the instrument panel will also Avoid unnecessary idling of diesel engine
be lit whenever the exhaust restrictor is active. equipped vehicles.
See Exhaust Brake Indicator Light on page 133 for
more information. If the engine idles too long, the temperature of the
engine coolant will fall below the normal operating
When the engine coolant temperature is below range. Low engine operating temperature causes
149°F (65°C) and the outside temperature is below several conditions which affect engine operation
50°F (10°C), the exhaust restrictor will come on and reduce engine life.
within 60 seconds of starting the engine. After
running the engine for an additional 10 seconds, The engine should be permitted to go through a
the engine idle will increase. warm-up period. Operate the vehicle at a minimum
of 600 rpm during the warm-up period. During
The exhaust restrictor will shut off and engine idle this period and during operation, the following
will return to normal once the engine is warmed observations should be made.
up, or the brake pedal is pressed.

71

Downloaded from www.Manualslib.com manuals search engine

 During this warm-up period, check your warning • The charging system light should come on
lights and gages: when the ignition key is turned to ON or START
• If oil pressure does not begin to rise within and should go out when the engine is running
15 seconds of starting, stop the engine and find above idle. If the light does not go out or comes
the cause. See Oil Pressure Gage on page 130 back on during normal engine operation, have
for more information. the charging system checked right away.
(This light tells you if the generator is not
• If the engine coolant temperature gage needle charging; it does not reflect the condition of
goes into the hot area on the gage, stop the the battery.) See Charging System Light on
engine and find the cause of the overheating. page 122 for more information.
See Engine Coolant Temperature Gage on
page 128 for more information. • The voltmeter charge indicator gage tells you
the condition of your battery’s charge. The gage
• If you have air brakes, the dual-needle air should be in the center area during engine
pressure gage should read at least 115 psi operation. The red area on the left indicates an
(790 kPa) for both service systems before you undercharge condition; the red area on the right
try to move the vehicle. When air pressure is indicates an overcharge. If the gage is in either
below 60 psi (420 kPa), the LOW AIR light will red area, have the battery and charging system
come on and you will hear a tone alarm. See checked right away. See Voltmeter Gage on
Brake System Warning Light on page 124 for page 122 for more information.
more information. If the pressure does not build
up or drops during warm-up, stop the engine Notice: Do not allow the engine to operate at
and find the cause before you try to move the low idle for more than five minutes. This can
vehicle. Recommended air pressure before cause low engine operating temperatures which
driving is 120 psi (830 kPa). See Air Pressure can affect engine operation and reduce engine
Gage on page 136 for more information. life. Engine idle speed should be increased to
1200 rpm whenever extended idle is required.

72

Downloaded from www.Manualslib.com manuals search engine

 Once started, the engine should be placed
under load to allow the engine coolant
temperature to reach 150°F (66°C) before {CAUTION:
shutting off the engine.
Plugging the cord into an ungrounded
Engine Coolant Heater outlet could cause an electrical shock.
Also, the wrong kind of extension cord
Your vehicle may be equipped with this feature.
could overheat and cause a fire. You
In very cold weather, 0°F (–18°C) or colder, could be seriously injured. Plug the cord
the engine coolant heater can help. You will get
into a properly grounded three-prong
easier starting and better fuel economy during
engine warm-up. Usually, the coolant heater 110-volt AC outlet. If the cord will not
should be plugged in a minimum of four hours reach, use a heavy-duty three-prong
prior to starting your vehicle. At temperatures extension cord rated for at least 15 amps.
above 32°F (0°C), use of the coolant heater is
not required. Your vehicle may also have an 4. Before starting the engine, be sure to unplug
internal thermostat in the plug end of the cord. and store the cord as it was before to keep it
This will prevent operation of the engine coolant away from moving engine parts. If you do
heater when the temperature is at or above not, it could be damaged.
0°F (−18°) as noted on the cord.
How long should you keep the coolant heater
To Use the Engine Coolant Heater plugged in? The answer depends on the outside
1. Turn off the engine. temperature, the kind of oil you have, and some
other things. Instead of trying to list everything here,
2. Find the cord on the drivers side in the engine
we ask that you contact your dealer/retailer in the
compartment.
area where you will be parking your vehicle. The
3. Plug it into a normal, grounded 110-volt AC dealer/retailer can give you the best advice for that
outlet. particular area.

73

Downloaded from www.Manualslib.com manuals search engine

 Diesel Engine Exhaust Brake There is an indicator light on the instrument panel
similar to the symbol on the switch, that will
The exhaust brake is used to help slow the come on when the exhaust brake is active.
vehicle and may assist the vehicle’s foundation See Exhaust Brake Indicator Light on page 133
brakes. The use of the exhaust brake will for more information.
assist the braking of the vehicle and prolong the
life of the foundation brake lining material. When using the exhaust brake, the proper gear
range selection is important. The exhaust brake will
The exhaust brake button is located in the be most effective if the gear range selected is the
instrument panel. lowest possible range that does not allow the
engine rpm to exceed 2500 rpm.
If you have an automatic transmission and press
this button, the transmission will downshift to
a factory default setting of fourth gear. To change
the default setting, or for more information on
factory default settings, contact your dealer
for assistance.
The accelerator and clutch pedals, on a manual
transmission, must be released in order for
the exhaust brake to engage.
Push the bottom of the button to turn the exhaust
brake on. When you push the top of the switch,
the exhaust brake will turn off.

74

Downloaded from www.Manualslib.com manuals search engine

 Two-Speed Rear Axle Electric Shift To operate off-road or under a heavy load, shift
into low range while the vehicle is standing still and
Control then operate the transmission normally.
The switch is located on the center console On the highway, with the rear axle in low range
between the driver’s and passenger’s seats. and the transmission in top gear, you can shift
See Instrument Panel Overview on page 100 for the rear axle to high range by raising the switch
more information. and releasing the accelerator momentarily.
Reapply the accelerator after you shift.
Under light load conditions, first shift the rear axle
into the high range with the vehicle at a standstill
and then operate the transmission normally.

While the switch is up, the rear axle is in the high

range. Push it down to get the low range.

75

Downloaded from www.Manualslib.com manuals search engine

 Automatic Transmission Operation
GM builds vehicles with five and six-speed {CAUTION:
automatic transmissions. This part of the
manual covers the basics of these. With Shifting into a drive gear while the engine
these transmissions, you will find an Allison® is running at high speed is dangerous.
Transmission Operator’s Manual in your vehicle Unless your foot is firmly on the brake
that goes into more detail. On the headliner, in pedal, your vehicle could move very
front of and above the driver, or in some other place rapidly. You could lose control and hit
near the driver, you will see a label that describes
people or objects. Do not shift into a drive
important operating facts about the automatic
transmission in your vehicle. Make sure you gear while your engine is running at high
follow the instructions on this label. speed.

{CAUTION: Overdrive Defeat

If your vehicle has this feature, you can select to
It can be dangerous to get out of your limit the transmission to fourth gear. This may
vehicle without the parking brake firmly be useful when operating at a higher Gross
set. Your vehicle can roll. If you have left Vehicle Weight (GVW) or where operating
conditions do not require fifth gear.
the engine running, the vehicle can move
suddenly. You or others could be injured.
To be sure your vehicle will not move,
even when you are on fairly level ground,
always set the parking brake.

76

Downloaded from www.Manualslib.com manuals search engine

 The overdrive defeat This feature is used for certain load and traffic
button is located in the conditions or when plowing snow. See the Allison®
instrument panel to Transmission Operator’s Manual in your vehicle
the right of the steering for more information about this.
column.
Manual Transmission Operation
Using the Clutch
See Instrument Panel Overview on page 100 for When you are starting to move the vehicle, it is
more information. important to begin with the engine speed at idle.
Press the button to turn on the overdrive defeat. Then start to engage the clutch and listen for an
Press the button again to turn off the overdrive engine speed drop of about 100 rpm. At this point,
defeat. The indicator light in the button will come the clutch is engaging, so you should increase the
on whenever overdrive defeat is active. engine speed and fully engage the clutch.
Notice: If you increase the engine speed
Automatic Transmission before the clutch is fully engaged, you could
Third-Gear Hold damage your transmission. Always allow
the clutch to fully engage before increasing
If your vehicle has this feature, your range engine speed.
selector has a 2-3 position. You cannot shift up
to the next higher gear when the transmission is in
this position unless your engine-governed speed
is exceeded, such as when going downhill.

77

Downloaded from www.Manualslib.com manuals search engine

 Six-Speed Transmission Eaton® Fuller® Nine and Ten-Speed
The transmission has gears that automatically Non-Synchronized Manual
synchronize when you shift up or down. Choose Transmissions
the gear which will maintain the road speed
If your vehicle has one of these non-synchronized
you want while keeping the engine above
transmissions, it is naturally somewhat
two-thirds of the governed speed. When the
complicated.
engine speed drops below two-thirds of the
governed speed, shift into the next lower gear The following are driving tips:
before your engine begins to become sluggish. • Always choose an initial starting gear suitable
When you shift down, be sure to double-clutch for the load and terrain.
if required.
• Always use double-clutching procedures when
See “Double Clutching” later in this section. shifting.
• Never move the range shift lever to the LO
speed gear position after HI range preselection,
or anytime the transmission is in the HI range.
• Never move the range knob or lever with the
shift lever in NEUTRAL while the vehicle is
moving.
• Never make a range shift while moving in
REVERSE (R).

78

Downloaded from www.Manualslib.com manuals search engine

 Double-Clutching Notice: Using the clutch brake for shifting
into any gear other than FIRST (1) or
You must use the double-clutching method when REVERSE (R) may cause premature wear of
you shift an unsynchronized gear set. Disengage the clutch brake and make gear shift effort
the clutch, shift to neutral and engage the clutch. more difficult. Do not use the clutch brake
When upshifting, slow the engine until the engine for shifting after engaging FIRST (1) or
rpm and road speed match. When downshifting, REVERSE (R).
accelerate the engine until the engine rpm and road
speed match. Then quickly disengage the clutch
and move the shift lever to the next gear position Power Take-Off (PTO)
and engage the clutch.
Your vehicle may be
Clutch Brake (Vehicles with equipped with power
Non-Synchronized Transmission) take-off (PTO). The PTO
switch is located on
A clutch brake is used to stop transmission input
the instrument panel.
shaft turning so that FIRST (1) or REVERSE (R)
gear selection can be initiated when the vehicle is
at a standstill and the engine is idling.
Press the clutch pedal all the way down to the
floorboard to apply the clutch brake.
When using the clutch brake, disengage the clutch
pedal and shift the transmission into either the initial An indicator in the switch comes on to show PTO
starting gear or REVERSE (R). If the tooth-butting is active.
occurs between the clutching teeth, re-engage the
clutch while applying light pressure to the shift
lever. This will provide for a smooth shift into either
FIRST (1) or REVERSE (R) gear.
79

Downloaded from www.Manualslib.com manuals search engine

 A PTO is a gearbox or mechanical device used to Parking a Vehicle With the Two-Speed
transmit mechanical power from the powertrain, Rear Axle
through gears or a transmission, to another
mechanical or hydraulic device. Before using a 1. With the engine running, shift the two-speed
PTO, refer to the manufacturer’s or installer’s rear axle into low. To be sure it is in low, you
instructions. will need to move the vehicle in gear just a little.
2. Hold the regular brake pedal down with your
Parking right foot.
3. Apply the parking brake. See Parking Brake
(With Hydraulic Brakes) on page 81 or
{CAUTION: Parking Brake (With Air Brakes) on page 82
for parking brake apply procedure.
If you do not park your vehicle properly,
4. Shift the transmission to NEUTRAL for
it can roll. If you have left the engine manual transmission or PARK (P) for
running, it can move very quickly. You or automatic transmission.
others could be injured. To be sure your
vehicle will not move, even when you are
on level ground, follow the steps below.

80

Downloaded from www.Manualslib.com manuals search engine

 Parking Brake (With Hydraulic
Brakes)
If your vehicle has hydraulic brakes, it has a
parking brake lever. The lever is located in the
center console.
Your vehicle may also be equipped with an
automatic transmission which has a center console
shift lever. This lever will have a PARK (P) position
on the shift indicator. Even when PARK (P) is
selected, be sure to apply the parking brake firmly
so the vehicle will not move.
To apply the parking brake, pull the lever all
the way up. The park brake light will come on Once the parking brake is applied, slowly remove
when the parking brake is applied. See Brake your foot from the regular brake pedal, while
System Warning Light on page 124 for more checking to see if the vehicle moves. If the vehicle
information. Then shift the transmission to does start to move, press the regular brake pedal
NEUTRAL for a manual transmission or PARK (P) and follow the parking brake burnish procedures.
for an automatic transmission. The vehicle must See Parking Brake Burnish Procedure on page 85
be stationary when applying the parking brake, for more information.
except while burnishing the parking brake linings. If your parking brake still does not set, take your
See Parking Brake Burnish Procedure on vehicle dealer/retailer for service.
page 85 for more information.

81

Downloaded from www.Manualslib.com manuals search engine

 To release the parking brake, first push down the Parking Brake (With Air Brakes)
regular brake pedal. Then, while pressing in the
release button, push the parking brake lever all the If your vehicle has air
way down and shift the transmission to NEUTRAL. brakes, you will have
The parking brake light will stay on if the parking this parking brake.
brake is not fully released. It is located above the
Notice: Driving with the parking brake on radio on the instrument
can overheat the brake system and cause panel.
premature wear or damage to brake system
parts. Verify that the parking brake is fully
released and the brake warning light is
off before driving.

Pulling it out applies the parking brake. The

parking brake light will come on when the air
parking brake is applied.

82

Downloaded from www.Manualslib.com manuals search engine

 Vehicles built for use as tractors or towing To charge a trailer’s air brake system do the
vehicles have two air brake controls. They look following:
like this:
1. Move your vehicle into the proper position.
2. Apply the parking brake by pulling the yellow
parking brake knob out.
3. Hook up the trailer air system properly.
4. Get into the vehicle.
5. Push and hold down the regular brake pedal.
6. Push in both the yellow parking brake and
the red trailer air supply knobs. This will
charge your trailer’s air system.
After a few minutes, the trailer system should be
fully charged. When it is, the air pressure gage will
{CAUTION: show about 125 to 135 psi (862 to 931 kPa).
See Air Pressure Gage on page 136 for more
information.
When the yellow PARKING BRAKE and
the red TRAILER AIR SUPPLY knobs are
both pushed in, your rig will be free to
move. It could strike someone or
something. When both of these knobs are
pushed in, hold the regular brake pedal
down to keep your rig from moving.

83

Downloaded from www.Manualslib.com manuals search engine

 For driving with a trailer, the yellow and red, if If the air pressure drops below 60 to 70 psi
equipped, knobs must be pushed in. When you are (413 to 482 kPa), the primary brake light and
not pulling a trailer, the red trailer air supply warning buzzer will come on. If the air pressure
knob must be pulled out. drops to 35 to 45 psi (241 to 310 kPa), the
red trailer air supply knob will automatically pop
out and apply the spring brakes on the trailer.
{CAUTION: If the air pressure drops to 35 to 45 psi
(241 to 310 kPa), the yellow park brake knob
If you apply any one of the air brake will automatically pop out and apply the spring
parking controls while the vehicle is brakes on the truck or tractor.
moving, your rig will stop suddenly. If you If you ever have a complete loss of air so that
are not ready for this, you or others could your air brakes automatically apply, there is a way
be injured. Do not apply any one of these that the tow operator can release the parking
controls while you are driving, unless you brakes to tow the vehicle. See Towing Your
have to make an emergency stop. Vehicle on page 182.

84

Downloaded from www.Manualslib.com manuals search engine

 Parking Brake Burnish Procedure Air Suspension
All vehicles which have hydraulic brakes will have a Your vehicle may have the Hendrickson
parking brake. It is recommended that the parking HAS Series single-axle air suspension which
brake be burnished as part of the new vehicle is designed for a single-axle on-highway use.
break-in. The parking brake will work best after it This feature is available in 19,000 lb (8 613.3 kg),
has been burnished following these instructions: 21,000 lb (9 525.4 kg) and 23,000 lb (10 432.6 kg)
1. Making sure that there is no other traffic capacities.
around, get the vehicle speed up to 20 mph Rear Air Suspension Dump Control
(32 km/h) and pull up to apply the parking
brake. Let the vehicle come to a complete stop. If your vehicle is equipped with the Hendrickson
Apply the base brakes and disengage the HAS Series single-axle air suspension, you
parking brake. may have this control. The air suspension dump
control allows the operator to lower the deck height
2. Repeat the burnishing procedure in Step 1 a approximately 4.5 inches (11.5 cm) from the
total of 10 times normal frame height.
3. Between stops, drive the vehicle about
2 1⁄2 miles (4 km) The switch to deflate
and inflate the air
Notice: Driving with the parking brake on can suspension is located
damage the transmission and brake system on the instrument panel.
parts. Verify that the parking brake is fully
released and the brake warning light is
off before driving.

85

Downloaded from www.Manualslib.com manuals search engine

 Press the bottom of the switch to deflate the air
suspension and lower the deck height. Press
the top of the switch to return the suspension to {CAUTION:
normal deck height.
Things that can burn could touch hot
An indicator light will come on and stay on
whenever the switch is in the dumped position. exhaust parts under your vehicle and
ignite. Do not park over papers, leaves,
Parking Over Things That Burn dry grass, or other things that can burn.

Engine Exhaust

{CAUTION:
Engine exhaust can kill. It contains the
gas carbon monoxide (CO), which you
cannot see or smell. It can cause
unconsciousness and death.
CAUTION: (Continued)

86

Downloaded from www.Manualslib.com manuals search engine

 Diesel Particulate Filter
CAUTION: (Continued)
Your vehicle has a Diesel Particulate Filter (DPF)
as part of the exhaust system to reduce vehicle
You might have exhaust coming in if: emissions. The DPF requires a unique exhaust
• The exhaust system sounds strange tailpipe with an exhaust cooler. The exhaust cooler
or different. mixes air with the exhaust at the tailpipe. This
• Your vehicle gets rusty underneath. lowers the exhaust temperature before it leaves
• Your vehicle was damaged in a the tailpipe.
collision. The DPF, the tailpipe, or other exhaust system
• Your vehicle was damaged when components must not be altered. The area where
driving over high points on the road the exhaust cooler connects to the tailpipe should
or over road debris. be inspected, especially the area where the fresh
• Repairs were not done correctly. air enters the cooler. Make sure the openings are
• Your vehicle or the exhaust system not restricted or plugged with mud or dirt which
has been modified improperly. could inhibit exhaust gas cooling. See “Exhaust
If you ever suspect exhaust is coming into System Inspection” under At Least Twice a Year
your vehicle: on page 316.
• Drive it only with all the windows
down to blow out any CO; and
• Have your vehicle fixed immediately.

87

Downloaded from www.Manualslib.com manuals search engine

 The DPF will regenerate (self-clean) itself as part
of normal operation. During regeneration, the
green DPF indicator is lit and you will notice a {CAUTION:
difference in engine noise and engine speed,
but this is normal. The Engine Control Module During DPF regeneration, the exhaust
(ECM) controls this function based on several system and exhaust gases are very hot.
factors including the amount of fuel consumed, Things that burn could touch hot exhaust
hours of engine operation and miles driven. parts under your vehicle and ignite. You
Notice: Use of diesel fuel other than Ultra or others could be burned. Do not park
Low Sulfur Diesel (15 ppm sulfur maximum) near or over papers, leaves, dry grass,
or engine oil other than low ash CJ-4 oil or other things that can burn.
will cause permanent damage to the DPF
and related components. This damage would
not be covered by your warranty. When the yellow DPF indicator comes on, the
filter is dirty and DPF regeneration is necessary.
Your DPF equipped vehicle has specific fuel When driving continues without regeneration,
and engine oil requirements. See What Fuel to the DPF indicator will change from yellow to
Use on page 195 and Engine Oil on page 206 to red. Continuing to drive the vehicle with the
make sure you use the required fuel and red indicator can cause filter damage.
engine oil.

88

Downloaded from www.Manualslib.com manuals search engine

 To clean the filter, either drive the vehicle above on, stop the idling and drive the vehicle
30 mph (50 km/h) to activate the automatic as described previously to clean the
regeneration or stop the vehicle and perform filter. Continued idling with the warning
the manual regeneration procedure. For the light/message on could cause irreversible
automatic regeneration, drive until the green DPF damage to the DPF requiring repair and
indicator light goes off. This will take approximately possible replacement that might not be
20 minutes. Once automatic regeneration has covered by your warranty.
started, drive until the green indicator light goes off Extended idling in PARK (P) can cause exhaust
to complete the regeneration in a single operation parts and gases to become very hot. Keep
if possible. the exhaust area clear of material that could ignite
During regeneration, or burn. See Parking Over Things That Burn on
the green DPF indicator page 86 for more information.
light will come on. For vehicles with Power Take-Off (PTO), monitor
See Diesel Particulate the instrument panel cluster for lights related
Filter Warning Light to the DPF.
on page 136. All engines consume some amount of engine oil.
This is normal. The by-product of combustion
of engine oil is ash. The ash will become trapped
Notice: Extended idle should be avoided in the DPF over the life of the vehicle. Eventually,
because the DPF system is not capable the buildup of ash will restrict the exhaust
of regenerating at idle. During extended gases and the DPF will need to be cleaned
idle, be sure to watch for the DPF warning or replaced.
light/message which could come on to indicate See Accessories and Modifications on page 191
that the DPF is becoming full and needs for important information.
regeneration. If the light/message comes

89

Downloaded from www.Manualslib.com manuals search engine

 Manual Regeneration Procedure completed, as indicated by the green DPF indicator
going off, in a single operation, automatic
regeneration might not be allowed until the vehicle
{CAUTION: is stopped and manual regeneration is performed
until completed.
During DPF regeneration, the exhaust 1. Check engine oil and engine coolant levels to
system and exhaust gases are very hot. be sure they are at proper operating levels.
Stay clear of the tailpipe area and do not 2. To prevent running out of fuel during
park over things that burn. You or others regeneration, make sure there is at least
could be burned or your vehicle could a quarter of a tank of fuel.
catch fire. See Parking Over Things That 3. Check to make sure the area near the
Burn on page 86. exhaust tailpipe and under the exhaust system
is clear of any materials that could catch
fire. Keep people away from the area of
If the yellow or red DPF indicator is on, you the exhaust system and exhaust gases.
can clean the DPF by performing a manual
regeneration. 4. Fully set the parking brake.
When it is safe to do so, stop the vehicle. Perform 5. Shift the transmission to PARK (P) or
manual DPF regeneration in a well ventilated area. NEUTRAL (N).
Manual DPF regeneration must be performed 6. Idle the engine. If you used the idling control
outdoors, as follows. Once manual regeneration knob to increase the engine speed, restore it all
is started, complete the regeneration in a single the way to the left to reduce the engine speed.
operation if possible. If manual regeneration is not

90

Downloaded from www.Manualslib.com manuals search engine

 7. If the vehicle has Power Take Off (PTO), turn Under certain operating conditions, manual
the PTO off. See Power Take-Off (PTO) on regeneration might not be able to be performed,
page 79. even if the soot level in the DPF requires
8. Press the DPF switch on the instrument regeneration. This can occur because of low
panel. See Instrument Panel Overview on coolant temperature, low battery voltage, or
page 100. The green DPF indicator light high exhaust temperature or immediately after
comes on, the exhaust gas control valve starting the vehicle. When manual regeneration is
operates, engine idle speed automatically requested, by pressing the DPF switch, when
increases, and DPF regeneration begins. coolant temperature is low, the exhaust restrictor
Do not leave the vehicle unattended during is engaged, the exhaust brake light comes on,
manual regeneration. and engine rpm increases to help raise engine
coolant temperature. When operating conditions
9. When the green DPF indicator light goes off, allow, the green DPF indicator will come on
regeneration is completed. Regeneration is to indicate that regeneration has started.
normally completed in about 30 minutes.

91

Downloaded from www.Manualslib.com manuals search engine

 Running the Engine While Parked
It is better not to park with the engine running. {CAUTION:
But if you ever have to, here are some things
to know. It can be dangerous to get out of your
vehicle if the automatic transmission shift
lever is not fully in PARK (P) with the
{CAUTION: parking brake firmly set. Your vehicle can
roll. Do not leave your vehicle when the
Idling the engine with the climate control engine is running unless you have to.
system off could allow dangerous exhaust If you have left the engine running, the
into your vehicle. See the earlier caution vehicle can move suddenly. You or others
under Engine Exhaust on page 86. could be injured. To be sure your vehicle
Also, idling in a closed-in place can let will not move, even when it is on fairly
deadly carbon monoxide (CO) into your level ground, always set the parking brake
vehicle even if the climate control fan is and move the automatic transmission
at the highest setting. One place this can shift lever to PARK (P), or the manual
happen is a garage. Exhaust — with transmission shift lever to NEUTRAL.
CO — can come in easily. NEVER park
in a garage with the engine running. Follow the proper steps to be sure your vehicle
Another closed-in place can be a blizzard. will not move.
See Winter Driving on page 174.

92

Downloaded from www.Manualslib.com manuals search engine

 Mirrors Outside Convex Mirrors

Outside Manual Mirrors

{CAUTION:
Adjust the outside rearview mirrors so you can
see a little of the side of your vehicle, and the area A convex mirror can make things (like
beside your vehicle from a comfortable driving other vehicles) look farther away than
position. Some mirrors can be folded in to
they really are. If you cut too sharply
enter narrow passageways.
into the right or left lane, you could hit
If the mirrors have the clearance lamps, they will a vehicle. Check your regular outside
be on when the headlamps or parking lamps mirrors (or your inside mirror, if you
are on. have one) before changing lanes.

Your vehicle may have convex mirrors on both

the driver’s side and the passenger’s side.
They are curved to allow more to be seen from
the driver’s seat. A convex mirror can make things
look farther away than they really are.

93

Downloaded from www.Manualslib.com manuals search engine

 Outside Heated Mirrors Storage Areas
For vehicles with this Overhead Storage
feature, the switch
is located on the
instrument panel.

Press the switch to turn the outside heated

rearview mirrors on. The switch indicator light
will come on and stay on whenever the outside
heated rearview mirrors are activated.
An overhead storage compartment is provided
above each of the driver’s and passenger’s seats.
To open push down on the inner button and lift
the compartment doors all the way up to lock
in position. Be sure the doors are securely closed
before moving the vehicle.

94

Downloaded from www.Manualslib.com manuals search engine

 Center Seat Storage

A storage compartment is located behind the

seatback in the center seat. To access the compartment, you must first pull
down on the handle located on the passenger side
to fold the seat all the way forward. To open,
squeeze both sides of the latch.

Center Console Storage Area

There are additional storage areas for small items
in the center console to the right of the driver’s seat.

95

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

96

Downloaded from www.Manualslib.com manuals search engine

 Section 3 Instrument Panel
Instrument Panel Overview ........................ 100 Climate Controls ......................................... 114
Hazard Warning Flashers .......................... 102 Climate Control System ............................. 114
Other Warning Devices ............................. 102 Outlet Adjustment ...................................... 116
Horn .......................................................... 102 Passenger Compartment Air Filter ............. 116
Tilt Wheel .................................................. 102 Warning Lights, Gages, and Indicators ..... 118
Turn Signal/Multifunction Lever .................. 103 Instrument Panel Cluster ........................... 119
Turn and Lane-Change Signals ................. 104 Speedometer and Odometer ...................... 120
Headlamp High/Low-Beam Changer .......... 104 Trip Odometer ........................................... 120
Flash-to-Pass ............................................ 105 Tachometer ............................................... 120
Windshield Wipers ..................................... 105 Engine Speed Limiter ................................ 121
Windshield Washer .................................... 106 Safety Belt Reminder Light ........................ 121
Cruise Control ........................................... 107 Safety Belt Reminder Tone ....................... 121
Headlamps ................................................ 110 Charging System Light .............................. 122
Headlamps on Reminder ........................... 111 Voltmeter Gage ......................................... 122
Daytime Running Lamps (DRL) ................. 111 Service Transmission Warning Light .......... 123
Marker Lamps ........................................... 112 Range Inhibit Warning Indicator ................. 124
Instrument Panel Brightness ...................... 112 Brake System Warning Light ..................... 124
Dome Lamps ............................................. 112 Antilock Brake System Warning Light ........ 127
Rear Reading Lamps ................................ 113 Trailer Antilock Brake System
Auxiliary Power Jacks ................................ 113 Warning Light ........................................ 127
Ashtray(s) and Cigarette Lighter ................ 114 Traction Control System Active Light ......... 128

97

Downloaded from www.Manualslib.com manuals search engine

 Section 3 Instrument Panel
Engine Coolant Temperature Gage ............ 128 Check Gages Warning Light ...................... 134
Low Coolant Warning Light ....................... 129 Fuel Gage ................................................. 135
Wait to Start Indicator ............................... 129 Water in Fuel Warning Light ...................... 135
Malfunction Indicator Lamp ........................ 130 Diesel Particulate Filter Warning Light ....... 136
Oil Pressure Gage ..................................... 130 Air Pressure Gage ..................................... 136
Low Oil Level Light ................................... 131 Hourmeter Gage ........................................ 137
Change Engine Oil Light ........................... 132 Audio System(s) ......................................... 137
Engine Overspeed Warning Light .............. 132 Setting the Time ........................................ 138
Engine Shutdown Warning Light ................ 132 AM-FM Radio ............................................ 139
Exhaust Brake Indicator Light .................... 133 Radio with Cassette .................................. 142
Differential Lock Indicator Light .................. 133 Radio Reception ........................................ 145
Reduced Engine Power Light .................... 133 Care of the Cassette Tape Player ............. 146
Highbeam On Light ................................... 134 Fixed Mast Antenna .................................. 146
Daytime Running Lamps (DRL)
Indicator Light ........................................ 134

98

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

99

Downloaded from www.Manualslib.com manuals search engine

 Instrument Panel Overview

100

Downloaded from www.Manualslib.com manuals search engine

 The main components of your instrument panel are the following:
A. Rear Reading Lamp Button. See Rear Reading K. Front Panel Release. See Lifting the Front
Lamps on page 113. Panel on page 247.
B. Cruise Control Button. See Cruise Control on L. Tilt Steering Column. See Tilt Wheel on
page 107. page 102.
C. Air Outlets. See Outlet Adjustment on M. Horn. See Horn on page 102.
page 116. N. Air Brake Controls (If Equipped). See Parking
D. Turn Signal/Multifunction Lever. See Turn Brake (With Hydraulic Brakes) on page 81
Signal/Multifunction Lever on page 103. or Parking Brake (With Air Brakes) on page 82.
E. Instrument Panel Cluster. See Instrument Panel O. Two-Speed Rear Axle Button. See Two-Speed
Cluster on page 119. Rear Axle Electric Shift Control on page 75.
F. Windshield Wiper/Washer Controls. Air Suspension Indicator (If Equipped). See
See Windshield Wipers on page 105 and Air Suspension on page 85. Air Suspension
Windshield Washer on page 106. Button (If Equipped). See Air Suspension
on page 85. Differential Lock Button
G. Climate Control System. See Climate Control
(If Equipped). See Rear Axle Differential
System on page 114.
Lock Control on page 157.
H. Exhaust Brake Button. See Diesel Engine
P. Audio System. See Audio System(s) on
Exhaust Brake on page 74.
page 137.
I. Heated Mirror Button (If Equipped).
Q. Marker and Clearance Lamp Button.
See Outside Heated Mirrors on page 94.
See Marker Lamps on page 112.
J. High Idle Button. See “Manual High Idle
R. Overdrive Defeat Button. See “Overdrive
System” under Starting the Diesel Engine on
Defeat” under Automatic Transmission
page 66. Power Take Off (PTO) (If Equipped).
Operation on page 76.
See Power Take-Off (PTO) on page 79.

101

Downloaded from www.Manualslib.com manuals search engine

 S. Cigarette Lighter. See Ashtray(s) and Cigarette When the hazard warning flashers are on,
Lighter on page 114. the turn signals will not work. The hazard warning
T. Traction Control Button. See Traction Control flashers will not flash if the brakes are applied.
System (TCS) on page 157.
U. Diesel Particulate Filter Button. See Diesel Other Warning Devices
Particulate Filter on page 87. If you carry reflective triangles, you can set
them up at the side of the road about
Hazard Warning Flashers 300 feet (100 m) behind your vehicle.
The hazard warning flashers let you warn police
and others that you have a problem. The front and Horn
rear turn signal lamps will flash on and off. Sound the horn by firmly pressing the pad in the
The hazard warning center of the steering wheel.
flashers are controlled
by the lever located to Tilt Wheel
the right of the steering
A tilt steering column allows you to adjust the
column. Move the lever
steering wheel before you drive. You can
up to start the hazard
also raise it to the highest level to give your legs
flashers. Move the lever
more room when you enter or exit the vehicle.
down again to turn the
flashers off.

The hazard warning flashers will work with or

without the key in the ignition.

102

Downloaded from www.Manualslib.com manuals search engine

 To tilt the column, hold Turn Signal/Multifunction Lever
the steering wheel and
pull the lever on the
left side of the column
to unlock the steering
column.

The multifunction lever, located on the left side of

Move the steering the steering column, includes the following:
wheel to a comfortable
location, then lock the • G Turn and Lane-Change Signals. See Turn
column in place by and Lane-Change Signals on page 104.
turning the lock lever • Headlamp High-Beam/Low-Beam Changer.
all the way down. See Headlamp High/Low-Beam Changer
on page 104.
• Flash-to-pass. See Flash-to-Pass on
page 105.
• 3 Headlamps. See Headlamps on page 110.
• J Cruise Control (if equipped). See Cruise
Control on page 107.

103

Downloaded from www.Manualslib.com manuals search engine

 Turn and Lane-Change Signals If a bulb is burned out, replace it to help avoid an
accident. If the arrows don’t go on at all when
The turn signals are controlled by the multifunction you signal a turn, check for burned-out bulbs and
lever. a blown fuse. See Fuses and Circuit Breakers
To signal a turn, move the lever all the way up for on page 277.
right or down for left and release it. When the
turn is finished, the lever will return automatically. Headlamp High/Low-Beam Changer
To signal a lane change, raise or lower the
lever until the arrow on the instrument panel starts 3 (Headlamp High/Low Beam Changer):
to flash. Hold the lever in this position until the To change the headlamps from low to high beam,
lane change has been completed. push the multifunction lever toward the instrument
panel. To return to low-beam headlamps, pull
An arrow on the the multifunction lever toward you. Then release it.
instrument panel
cluster will flash in While the high beams
the direction of the are on, this indicator
turn or lane change. light on the instrument
panel cluster will also
be on.

If you signal a turn or a lane change and the

arrows on the instrument panel turn on but do
not flash, check the turn signal flasher and circuit
breaker.

104

Downloaded from www.Manualslib.com manuals search engine

 Flash-to-Pass Windshield Wipers
This feature lets you use the high-beam
headlamps to signal a driver in front of you that
you want to pass. It works even if the headlamps
are in the automatic position.
To use this feature, pull the multifunction lever
toward you, then release it.
If the headlamps are in the automatic position
or on low beam, the high-beam headlamps will
turn on. They’ll stay on as long as you hold
the lever toward you. The high-beam indicator
on the instrument panel cluster will come on. The windshield wipers are controlled by the lever
Release the lever to return to normal operation. located on the right side of the steering column.
The windshield wipers have these positions:
9 (OFF): Turn the knob at the end of the
windshield wiper lever to turn off the wipers.
- - - (Intermittent): Turn the knob to the
intermittent setting to delay the wiper speed.
This can be very useful in light rain or snow.
When you turn the knob to this setting, you can
also set the wiper speed. See the following text
for more information.

105

Downloaded from www.Manualslib.com manuals search engine

 6: Turn this band on the windshield wiper lever to Windshield Washer
set the delay time between wipes. The closer
to the top of the lever, the shorter the delay. To wash the window,
you must have the
R (LO): Turn the knob to this setting to operate windshield wipers on.
the windshield wipers at a low speed.
RR (HI): Turn the knob to this setting to operate
the windshield wipers at a high speed.
Be sure to clear ice and snow from the wiper
blades before using them. If they are frozen to
the windshield, carefully loosen or thaw them.
If your blades do become worn or damaged, get
new blades or blade inserts. For more information, L (Washer Fluid): Press this button at the end of
see Windshield Wiper Blade Replacement on the multifunction lever located on the right side of
page 250. the steering column. Spray will continue as long as
Heavy snow or ice can overload your wipers. this button is pressed.
The windshield wiper motor is protected
from overload by a circuit breaker and a fuse.
If the motor overheats due to heavy snow or
{CAUTION:
ice, the wiper will stop until the motor cools.
Although the circuit is protected from electrical In freezing weather, do not use your
overload, overload due to heavy snow or ice may washer until the windshield is warmed.
cause wiper linkage damage. Always clear ice Otherwise the washer fluid can form ice
and heavy snow from the windshield before using on the windshield, blocking your vision.
your windshield wipers.

106

Downloaded from www.Manualslib.com manuals search engine

 Cruise Control
With cruise control, the vehicle can maintain a {CAUTION:
speed of about 25 mph (40 km/h) or more without
keeping your foot on the accelerator. Cruise Cruise control can be dangerous where
control does not work at speeds below about you cannot drive safely at a steady speed.
25 mph (40 km/h). So, do not use your cruise control on
If your vehicle has this feature, the controls are winding roads or in heavy traffic.
located on the multifunction lever on the left side of Cruise control can be dangerous on
the steering column. slippery roads. On such roads, fast
If the vehicle has a automatic transmission and changes in tire traction can cause
the brakes are applied, the cruise control will excessive wheel slip, and you could
shut off. lose control. Do not use cruise control
If the vehicle has a manual transmission and on slippery roads.
the brakes are applied, or the clutch pedal
is pushed, the cruise control will shut off.

107

Downloaded from www.Manualslib.com manuals search engine

 Setting Cruise Control
This button is located at
{CAUTION:
the lower left side of the
instrument panel. It If you leave your cruise control on when
turns the cruise control you are not using cruise, you might hit a
on and off. button and go into cruise when you do
not want to. You could be startled and
even lose control. Keep the cruise control
switch off until you want to use cruise
control.
J SET: Press this button at the end of the
multifunction lever to set the cruise control speed.
1. Press the J button to turn the cruise control
+ RES: Move the band to this position to
on. The light inside the switch will turn on.
resume the set speed.
2. Get up to the speed you want.
3. Press in the J SET button at the end of the
lever and release it.
4. Take your foot off the accelerator pedal.

108

Downloaded from www.Manualslib.com manuals search engine

 Resuming a Set Speed • Move the band on the multifunction lever from
on to the +RES position. Hold it there until
Suppose you set the cruise control at a desired the vehicle reaches the speed desired, and
speed and then you apply the brake or the clutch. then release the band. To increase the vehicle
This, of course, shuts off the cruise control. speed in small amounts, move the band on the
But you do not need to reset it. multifunction lever to the +RES position and
Using the accelerator pedal, increase your release it. Each time this is done, the vehicle
vehicle’s speed to 25 mph (40 km/h) or more. will go about 1 mph (1.6 km/h) faster.
The cruise control does not work below this speed.
Reducing Speed While Using Cruise
Move the band on the lever to the +RES position
and release it. The vehicle will accelerate to
Control
the previously set speed. Press the J SET button until you reach the lower
Increasing Speed While Using Cruise speed desired, then release it.
Control To slow down in very small amounts, tap the
button briefly. Each time this is done, your vehicle
There are two ways to go to a higher speed: goes about 1 mph (1.6 km/h) slower.
• Use the accelerator pedal to get to the
Passing Another Vehicle While Using
higher speed. Press the J SET button,
then release the button and the accelerator Cruise Control
pedal. You will now cruise at the higher speed. Use the accelerator pedal to increase your speed.
When you take your foot off the pedal, the vehicle
slows down to the cruise control speed that was
set earlier.

109

Downloaded from www.Manualslib.com manuals search engine

 Using Cruise Control on Hills Erasing Speed Memory
How well the cruise control works on hills depends When the ignition is turned off, the cruise control
upon your speed, load, and the steepness of the set speed memory is erased.
hills. While going up steep hills, you might want
to step on the accelerator pedal to maintain the Headlamps
vehicle speed. While going downhill, you might
have to brake or shift to a lower gear to keep the The multifunction lever operates the exterior
vehicle speed down. Of course, applying the brake lamps.
or clutch disengages the cruise control. Many
drivers find this to be too much trouble and do O (Exterior Lamps): Turn the band on the
not use cruise control on steep hills. multifunction lever with this symbol to operate the
exterior lamps.
Ending Cruise Control The exterior lamp band has three positions:
There are four different ways to turn off the cruise
control: 9 (OFF): Turn the band to this position to turn off
all lamps, except the daytime running lamps (DRL).
• Step lightly on the brake pedal (manual and
automatic transmissions). ; (Parking Lamps): Turn the band to this
• Press the clutch pedal to the floor (manual position to turn on the parking lamps, together
transmissions). with the following:
• Turn off cruise control by pressing • Marker Lamps (unless your vehicle has the
the J button again. marker and clearance lamps switch)
• Shift the transmission to NEUTRAL. • Tail Lamps
• License Plate Lamps
• Instrument Panel Lights

110

Downloaded from www.Manualslib.com manuals search engine

 2 (Headlamps): Turn the band to this position The DRL system will make the headlamps come
to turn on all the headlamps, together with on at reduced brightness when the following
the previously listed lamps and lights. conditions are met:
A circuit breaker protects the headlamps. If you • The ignition is on.
have an electrical overload, the headlamps • The headlamp band is in the OFF position.
will flicker on and off. Have the headlamp wiring • The parking brake is released.
checked right away if this ever happens.
When the DRL are on, only your low-beam
Headlamps on Reminder headlamps will be on. The exterior lamps and
instrument panel will not be lit.
If your vehicle has this feature, an alarm will sound
when the headlamps and/or parking lamps are When it begins to get
turned on and the ignition is in LOCK or ACC. dark, the DRL indicator
light is a reminder to
turn your headlamp
Daytime Running Lamps (DRL) switch on.
Daytime Running Lamps (DRL) can make it easier
for others to see the front of your vehicle during
the day. DRL can be helpful in many different
driving conditions, but they can be especially The other lamps that come on with your
helpful in the short periods after dawn and before headlamps, will also come on.
sunset. Fully functional daytime running lamps
are required on all vehicles first sold in Canada. When the headlamp band is turned to OFF,
the regular lamps will go off, and the low-beam
headlamps will change to the reduced brightness
of DRL.

111

Downloaded from www.Manualslib.com manuals search engine

 To idle your vehicle with the DRL off, set the Instrument Panel Brightness
parking brake. The DRL will stay off until
the parking brake is released. If your vehicle has this
As with any vehicle, you should turn on the feature, the knob is
regular headlamp system when needed. located on the lower
right of the instrument
Marker Lamps panel.

If your vehicle is designed for trailer towing, this

button will operate the marker and clearance lamps.

The marker and

clearance lamp button is
located in the instrument Turn the knob counterclockwise to brighten the
panel. See Instrument instrument panel lights or clockwise to dim them.
Panel Overview on
page 100. Dome Lamps
The dome lamp switch can be set to three
different positions: DOOR, OFF, and ON.
When the switch is set to DOOR, the dome
lamp will come on only when the driver’s door
is open. If the switch is set in the OFF position,
the dome lamp will not illuminate, even when
Press the button to turn the lamps on and press it the door is opened. The dome lamp will remain
again to turn them off. on whether or not the door is open if the switch
The headlamp band will not operate these lamps. is placed in the ON position.
112

Downloaded from www.Manualslib.com manuals search engine

 Rear Reading Lamps Auxiliary Power Jacks
Your vehicle may have If your vehicle has these
a rear lamp button power jacks, they are on
which is located on the the console to the right
lower left side of the of the driver’s seat.
instrument panel.
See Instrument Panel
Overview on page 100.

When pressed in, an indicator light inside the These jacks provide 12-volt power so you can
button will illuminate. operate things such as a citizen’s band (CB) radio
Because your truck may be finished in a variety or a cellular phone. You will see positive (red)
of different ways by a number of companies, and negative (black) outlets. They are protected
the function of this switch depends on how by a 15-amp circuit breaker.
your vehicle was finished after it left the factory. Notice: If you plug in FM communications
Refer to the other manuals that came with equipment at the cigarette lighter, you could
your vehicle to learn more about this switch, damage your vehicle. Over time, the high heat
or see your dealer for more information. from the equipment could damage wires and/or
start a fire. Do not plug in FM communications
equipment at the ashtray area.

113

Downloaded from www.Manualslib.com manuals search engine

 Ashtray(s) and Cigarette Lighter Climate Controls
Your vehicle may have an ashtray and a cigarette
lighter located in the center floor console. To Climate Control System
open the removable ashtray, flip open the top.
With this climate control system, you can control
Notice: If you put papers, pins, or other the heating, cooling, and ventilation for your
flammable items in the ashtray, hot cigarettes vehicle.
or other smoking materials could ignite
them and possibly damage your vehicle.
Never put flammable items in the ashtray.
To use the cigarette lighter, push it in all the way
and let it go. When it’s ready, it will pop back
out by itself.
Notice: Holding a cigarette lighter in while
it is heating does not let the lighter back away
from the heating element when it is hot.
Damage from overheating can occur to the
lighter or heating element, or a fuse could be Slide the temperature lever to the left toward
blown. Do not hold a cigarette lighter in while it COLD for cooler air. Slide it to the right toward
is heating. HOT for warmer air.

114

Downloaded from www.Manualslib.com manuals search engine

 To change the current mode, press one of the A/C (Air Conditioning): If your vehicle has this
following buttons: feature, you can use your air conditioner by
selecting one of the mode buttons, selecting
H (Vent): This mode directs air to the instrument a fan speed and pressing the A/C button.
panel outlets.
On hot days, open the windows to let hot inside
) (Bi-Level): This mode directs about half of air escape; then close them. This helps to reduce
the air to the instrument panel outlets, and the time it takes for your vehicle to cool down.
then directs most of the remaining air to the floor It also helps the system to operate more efficiently.
outlets. Some air may be directed toward the
windshield. For quick cool down on hot days:
6 (Floor): This mode directs most of the air to 1. Select the vent mode.
the floor outlets with some air directed to the 2. Select the recirculation mode.
outboard outlets for the side windows and some 3. Select A/C.
air directed to the windshield.
4. Select the coolest temperature.
9 (Fan): The fan has five speed settings: OFF, 1,
5. Select the highest fan speed.
2, 3, and 4. Slide the fan lever to OFF to turn the
system off. Outside air will still come out of the floor Using these settings together for long periods of
outlets whenever the vehicle is moving. time may cause the air inside of your vehicle to
become too dry. To prevent this from happening,
A (Recirculation): If you press this button, the air after the air in your vehicle has cooled, turn the
inside the cab will be recirculated. If your vehicle
has air conditioning, using recirculation will give you recirculation mode off. The air-conditioning system
maximum cooling. This mode can also be used to removes moisture from the air, so you may
keep outside air, odors and dust from entering your sometimes notice a small amount of water dripping
vehicle. underneath your vehicle while idling or after turning
off the engine. This is normal.
Recirculation is not available in Defog or Defrost
modes.
115

Downloaded from www.Manualslib.com manuals search engine

 Defogging and Defrosting Outlet Adjustment
There are two modes to clear fog or frost from The air outlets are located in the center and on the
your windshield. Press the defog button to sides of your instrument panel. See Instrument
clear the windows of fog or moisture and warm Panel Overview on page 100. You can move the
the passengers. Press the defrost button to vents to direct the flow of air or close the outlets
remove fog or frost from the windshield more altogether. When you close a vent, it will increase
quickly. the flow of air coming out of any vents that
are open.
/ (Defog): Press this button to direct the air
equally between the windshield and the floor Keep the path under the front seats clear of
outlets. When you select this mode, the system objects to help circulate the air inside of your
turns off recirculation and runs the air-conditioning vehicle more effectively.
compressor unless the outside temperature is
at or below freezing. The recirculation mode Passenger Compartment Air Filter
cannot be selected while in the defog mode.
The passenger compartment outside air is
0 (Defrost): Press this button to direct most of routed through a passenger compartment filter.
the air to the windshield and the side window The filter removes certain debris, including dirt
outlets, with some air directed to the floor outlets. and leaves. Reductions in your climate control
In this mode, the system will automatically turn system performance may indicate that the
off recirculation and run the air-conditioning filter needs to be inspected and cleaned.
compressor, unless the outside temperature
is at or below freezing. Recirculation cannot
be selected while in the defrost mode.

116

Downloaded from www.Manualslib.com manuals search engine

 The passenger compartment air filter can be 2. Pull the tab and
accessed from the outside of the vehicle on the remove the filter.
front passenger side. It is concealed by the front
access panel. Pull the latch inside the cab on the
driver’s side of the vehicle to open the front panel.
To inspect and clean the passenger compartment
air filter, use the following steps:
1. Pull the tab located
at the bottom of the
screen.

3. Rinse both sides of the filter with clean water.

4. Reinstall the filter and screen after cleaning.

117

Downloaded from www.Manualslib.com manuals search engine

 Warning Lights, Gages, and Gages can indicate when there may be or is a
problem with one of your vehicle’s functions.
Indicators Often gages and warning lights work together
to let you know when there is a problem with
This part describes the warning lights and gages
your vehicle.
on your vehicle. The pictures help to locate them.
When one of the warning lights comes on and
Warning lights and gages can signal that something
stays on as you are driving, or when one of
is wrong before it becomes serious enough to
the gages shows there may be a problem, check
cause an expensive repair or replacement. Paying
the section that tells you what to do about it.
attention to the warning lights and gages could also
Please follow this manual’s advice. Waiting to
save you or others from injury.
do repairs can be costly and even dangerous.
Warning lights come on when there may be or So please get to know your vehicle’s warning
is a problem with one of your vehicle’s functions. lights and gages. They can be a big help.
As the details show on the next few pages,
some warning lights come on briefly when you
start the engine just to let you know they are
working. If you are familiar with this section,
you should not be alarmed when this happens.

118

Downloaded from www.Manualslib.com manuals search engine

 Instrument Panel Cluster
Your instrument panel cluster is designed to let you know at a glance how your vehicle is running. You
will know how fast you are going, about how much fuel is left and many other things you will need to drive
safely and economically.

119

Downloaded from www.Manualslib.com manuals search engine

 Speedometer and Odometer To display the odometer reading with the ignition
off, press the reset button.
Your speedometer lets you see your speed in
The hourmeter gage is accessed through the trip
both miles per hour (mph) and kilometers per
odometer, for more information see Hourmeter
hour (km/h).
Gage on page 137.
Your odometer shows how far your vehicle
has been driven, in either miles (used in the Tachometer
United States) or kilometers (used in Canada).
This gage shows the
Trip Odometer safe operating range
The trip odometer can tell you how far your for the engine speed
vehicle has been driven since you last set the trip in revolutions per
odometer to zero. minute (rpm).

While the engine is running, press the reset

button, located to the right of the trip odometer,
to toggle between the trip odometer and the
regular odometer. Holding the reset button for
two seconds while the engine is running and
the trip odometer is displayed, will reset it.

120

Downloaded from www.Manualslib.com manuals search engine

 Engine Speed Limiter Safety Belt Reminder Light
All engines have electronic engine speed limiting When the key is turned to ON or START, a light
to 2,550 rpm. will come on for several seconds to remind people
to fasten their safety belts.
Engine Road Speed Governor
This system controls maximum vehicle speed The safety belt light
automatically and reduces engine power will also come on
until vehicle speed gets down to maximum and stay on for
governed speed. several seconds.
A 75 mph (120 km/h) road speed governor is
standard for most models, but can be programmed
to any speed below that default setting. Other
models have a default setting of 80 to 85 mph
(128 to 136 km/h). You may have a label on the Safety Belt Reminder Tone
headliner of your vehicle with more information If your vehicle has this feature, when you turn
on your engine road speed governor. See your key to ON or START, a tone will sound
your dealer for assistance with programming for several seconds to remind people to fasten
your engine limited speed. their safety belts.

121

Downloaded from www.Manualslib.com manuals search engine

 Charging System Light Voltmeter Gage
The charging system When your engine is
light may be located in running, the voltmeter
the instrument panel gage shows the
cluster, or with the charging system
auxiliary warning lights voltage.
in the center of the
instrument panel.

It should come on briefly when you turn on the

ignition, before the engine is running, as a check to
show that it is working.
Readings in either warning zone indicate a
If it stays on, or comes on while you are driving, possible problem in the electrical system.
have your vehicle checked right away. You
could have a loose generator drive belt or some Readings in the low warning zone may occur
other problem. when a large number of electrical accessories are
operating in the vehicle and the engine is left at
Driving while this light is on will drain your battery. an idle for an extended period. This condition
If you must drive a short distance with the light is normal since the charging system may not be
on, turn off your radio and other accessories. able to provide full power at engine idle. As engine
Sustained driving with a generator failure could speeds are increased, this condition should
result in a lack of back-up braking if the engine correct itself because higher engine speeds allow
quits or the power steering pump should fail. the charging system to create maximum power.

122

Downloaded from www.Manualslib.com manuals search engine

 You can only drive a short time on the battery. If this light comes on while you are driving, do not
Be sure to shut off the radio, the fan or any use the transmission shift control or you may lose
unnecessary accessories and have the system forward gears. The computer for the transmission
serviced. senses a problem and chooses a gear to stay in so
that you can drive the vehicle in that gear. You may
Service Transmission Warning Light not be able to drive as fast or back up when this
light is on.
If your vehicle has an Allison® automatic
transmission, certain transmission malfunctions Notice: If you continue driving your vehicle
will turn this light on. after the transmission warning light comes on,
you could damage the transmission. While this
This light is located with light is on, the transmission cannot operate
the auxiliary warning in all gears. If you attempt to shift gears, the
lights in the center of vehicle may not continue to move. Do not
the instrument panel. attempt to shift gears while the transmission
warning light is on. Instead, drive directly to
an authorized dealer for service. If you cannot
drive to a dealer immediately, have the vehicle
towed.

123

Downloaded from www.Manualslib.com manuals search engine

 Range Inhibit Warning Indicator Brake System Warning Light
Your vehicle may have Your vehicle has either hydraulic or air brakes.
this light. Each system has different warning lights.
Hydraulic Brake System Warning
Lights
Vehicles with hydraulic brake systems have
two brake system warning lights on the
instrument panel.
If your vehicle has an Allison 1000/2000/2200/2400/
2500 series automatic transmission, this light may If this light comes on,
come on and a lighted bar under the current gear the fluid level in the
selected will flash. master cylinder reservoir
is low or there is a
If your vehicle has an Allison 3000/3500 series
problem with the
automatic transmission, the current gear selected
hydraulic brakes.
on the pushbutton display will flash.
The flashing bar, light, or gear selection indicates
that transmission range shifts may not occur.
When it comes on, you will also hear a
For detailed information on shift inhibit limitations, warning tone.
see the Allison Automatic Transmission Operator’s
Manual in your vehicle for further information. This light should come on briefly when you turn
the ignition key to ON. If it does not come on, then
have it fixed so it will be ready to warn you if
there is a problem.

124

Downloaded from www.Manualslib.com manuals search engine

 The brake system warning light may come on, Both of these lights should come on briefly every
and the warning tone may sound, when you time you start your engine. If they do not come
are turning and braking at the same time. This is on then, have them fixed so they will be ready to
normal. See “Hydraulic Brake Systems” under warn you if there is a problem. If one or both
Braking on page 152. of these warning lights stay on after you start the
engine, there could be a brake problem. Have
If this light comes on, your brake system inspected right away.
it means there may be
a problem with the If one or both of these lights come on while you are
brake system. driving, pull off the road and stop carefully. You may
notice that the pedal is harder to push, or the pedal
may go closer to the floor. It may take longer to
stop. If the brake system warning light is still on,
have the vehicle towed for service. See Towing
When this light comes on, you will also hear Your Vehicle on page 182. See “Hydraulic Brake
a warning tone. Have the system repaired Systems” under Braking on page 152 for further
immediately. information.

125

Downloaded from www.Manualslib.com manuals search engine

 Parking Brake Warning Light When the warning light comes on while you are
driving, you should drive only as far as the nearest
This light will also come on when you set the point of safety and then stop the vehicle.
parking brake. The light will stay on if your parking
brake does not release fully.
Air Brake System Warning Light {CAUTION:
Vehicles with air brake systems have a brake If the air brake system warning light
system warning light on the instrument panel.
comes on and the warning tone sounds,
the vehicle can stop suddenly and without
further warning. This is because the
parking brake will come on if the pressure
falls below 35 to 45 psi (240 to 310 kPa).
You or others could be injured. If the air
brake system warning light comes on and
United States Canada the warning tone sounds, stop as soon as
you can. You will not know how quickly
The low air warning light should come on, as a the system is losing pressure, so be
check, whenever you start the engine. However, aware that the parking brake may come
it is designed to come on, and stay on, when on suddenly.
brake reservoir pressure has dropped below
60 psi (410 kPa).

126

Downloaded from www.Manualslib.com manuals search engine

 Antilock Brake System Trailer Antilock Brake System
Warning Light Warning Light
This light will come on If your vehicle is
briefly when you start connected to a trailer
the engine, then it with antilock brakes, this
will turn off. This light should come on
is normal. briefly, as a check, when
you turn on the ignition.

If the light stays on, or comes on when you are When this light comes on and stays on, it means
driving, your vehicle needs service. If the brake there is something wrong in the trailer Antilock
or low air warning light is not on, you still Brake System (ABS). Have the system repaired
have brakes, but you do not have the antilock immediately.
brake feature. If the brake and/or low air warning If an ABS equipped trailer is not connected, this
light is on, you do not have antilock brakes light is not functional.
and there is a problem with your regular brakes.
See Brake System Warning Light on page 124 and
Antilock Brake System (ABS) on page 154 for
more information.

127

Downloaded from www.Manualslib.com manuals search engine

 Traction Control System Engine Coolant Temperature Gage
Active Light
If your vehicle has the
Traction Control System
(TCS), this light will
come on when the
system is limiting
wheel spin.

Slippery road conditions may exist if the TCS United States Canada
active light comes on, so adjust your driving
accordingly. This gage shows the engine coolant temperature.
If the gage pointer moves into the red area,
The light will stay on for a few seconds after the your engine coolant might have overheated and
system stops limiting wheel spin. your engine may be too hot. You should pull off
the road, stop your vehicle and turn off the engine
as soon as possible. See Engine Overheating
on page 219 for more information.

128

Downloaded from www.Manualslib.com manuals search engine

 Low Coolant Warning Light Wait to Start Indicator
You have a low coolant This indicator, in the
warning light. If this light center of the instrument
comes on, your system panel, will come on
is low on coolant and the when the glow plugs
engine may overheat. are on and the ignition
key is in ON or START.

The warning light should come on briefly, as a Wait until the indicator turns off before turning the
check, when you turn on the ignition. ignition key to START.
When it comes on, you will also hear a warning When the temperature is below 32°F (0°C), you
tone for 10 seconds. See Engine Coolant on should wait no more than 10 seconds to start your
page 216 and have your vehicle serviced as vehicle. See Ignition Positions on page 66 for
soon as you can. more information.
This light may also come on if your vehicle is
equipped with the automatic engine shutdown
system and engine shutdown has begun.

129

Downloaded from www.Manualslib.com manuals search engine

 Malfunction Indicator Lamp engine might not run as smoothly. This could
lead to costly repairs that might not be
Service Engine Soon Light covered by your warranty.

If this light comes on or Oil Pressure Gage

flashes while you are
driving, two things
may happen.

First, you will not notice any difference in engine

performance, but your tail pipe emissions may
increase. Second, your engine may not run
properly or may stall without warning. If either of
these things happen, drive or tow your vehicle United States Canada
to your dealer for service.
The engine oil pressure gage, on the lower right
This light should come on when the ignition is on, portion of your instrument panel cluster, shows
but the engine is not running, as a check to show engine oil pressure in psi (pounds per square inch)
you it is working. If it does not come on at all, have it or in kPa (kilopascals). Oil pressure may vary
repaired. with outside temperature and oil viscosity,
Notice: If you keep driving your vehicle with but readings of 30 to 40 psi (205 to 275 kPa)
this light on, after a while, the emission are normal. The normal operating range should
controls might not work as well, your vehicle’s be between 35 and 70 psi (240 to 480 kPa).
fuel economy might not be as good, and the

130

Downloaded from www.Manualslib.com manuals search engine

 A reading in the low pressure zone may be Low Oil Level Light
caused by a dangerously low oil level or other
problem. See Engine Oil on page 206 and This light comes
Scheduled Maintenance on page 295 for more on briefly when the
information. engine is started.
This normal.
{CAUTION:
Do not keep driving if the oil pressure is
low. If you do, your engine can become If the light fails to come on, have it repaired as
so hot that it catches fire. You or others soon as possible so you will be aware when the
could be burned. Check your oil as soon oil level is low.
as possible and have your vehicle If this light comes on and stays on, it means the
serviced. engine is low on oil. You need to check the oil level
right away. See Engine Oil on page 206 for more
information.
Notice: Lack of proper engine oil maintenance
may damage the engine. The repairs would Notice: Lack of proper engine oil maintenance
not be covered by your warranty. Always follow may damage the engine. The repairs would
the maintenance schedule in this manual for not be covered by your warranty. Always follow
changing engine oil. the maintenance schedule in this manual for
changing engine oil.

131

Downloaded from www.Manualslib.com manuals search engine

 Change Engine Oil Light Engine Overspeed Warning Light
Your vehicle may have a If your vehicle has this
change engine oil light. light, it will come on if
your engine is operating
at too many revolutions
per minute (rpm).

It should come on briefly as a bulb check when

you start the engine. If the light does not come on, It will also come on for a moment as a check
have it serviced. when you start your engine.
If the change engine oil light comes on and stays If it comes on when you’re driving, reduce your
on after you start the engine, have the oil changed. engine speed immediately.
For additional information on when to change
engine oil for Isuzu 6H diesel engines, see Engine
Engine Shutdown Warning Light
Oil on page 206. To reset the change engine oil
light, see Engine Oil on page 206. If your vehicle has the
engine shutdown
feature, this light will
come on when engine
shutdown is active.

132

Downloaded from www.Manualslib.com manuals search engine

 Exhaust Brake Indicator Light The light will come on momentarily during starting.
If the light fails to come on, have it repaired as
For vehicles with an soon as possible so you will be aware when
exhaust brake, this light the lock system is in use.
is located above the
climate controls. Reduced Engine Power Light
If the check engine and
reduced engine power
lights are on, the throttle
The exhaust brake indicator light will come on may be disabled, and a
and stay on whenever the diesel engine exhaust noticeable change in the
brake or exhaust restrictor is active. For more vehicle’s performance
information, see Diesel Engine Exhaust Brake may occur.
on page 74.

Differential Lock Indicator Light If the reduced engine power light is on, but there
is no change in performance, proceed to your
If your vehicle has this destination. The performance may be reduced the
feature, this light is next time the vehicle is driven. The vehicle may
located in the center of be driven at a slower speed while the reduced
the instrument panel. engine power light is on, but acceleration
The light is on when the and speed may be limited.
inter-axle differential lock Anytime the check engine light stays on, the
system is in use. vehicle should be taken to an authorized dealer
as soon as possible for service.

133

Downloaded from www.Manualslib.com manuals search engine

 Highbeam On Light When it begins to get dark, the DRL indicator light
is a reminder to turn on your headlamps.
This light comes on
when the high-beam Check Gages Warning Light
headlamps are in use.
This light will come on
as you’re starting the
engine, just as a check.

See Headlamp High/Low-Beam Changer on

page 104 for more information.

Daytime Running Lamps (DRL) If it ever comes on and stays on while you are
Indicator Light driving, however, it means that either your engine
coolant temperature gage or your engine oil
This light is located on pressure gage may be showing a reading in the
the instrument panel warning zone.
cluster. It goes on When the check gages light comes on, you will
whenever the Daytime also hear a warning tone. The tone and the
Running Lamps are on. light will stay activated until the problem is
corrected.

See Daytime Running Lamps (DRL) on page 111

for further information.

134

Downloaded from www.Manualslib.com manuals search engine

 Fuel Gage Here are four concerns of some operators. None
of these shows a problem with your fuel gage:
Your fuel gage is • The gage moves a little when you turn a
located on the right corner or speed up.
side of your instrument • The gage doesn’t go back to empty when you
panel cluster. turn off the ignition.
• At the gas station, the pump shuts off before
the gage reads full.
• It takes a little more or less fuel to fill up than
the gage indicated.

Water in Fuel Warning Light

When the ignition is on, your fuel gage lets you
know about how much fuel you have left. When the If your vehicle is
gage first shows empty, you’ll still have a little fuel equipped with a diesel
left, but you should get more fuel soon. engine, this light will
come on to warn
If your vehicle has dual fuel tanks, the reading on you that there is water
the gage is the total fuel left in both tanks. in the fuel system.

For more information on how this light works,

see Water in Fuel on page 198.

135

Downloaded from www.Manualslib.com manuals search engine

 Diesel Particulate Filter Air Pressure Gage
Warning Light
If your vehicle has air
Your vehicle may have brakes, this gage shows
two Diesel Particulate the air pressure for
Filter (DPF) Warning both your front and
lights. rear brake systems.

These lights will come on briefly when the ignition

is turned to ON. One of these lights will come
on green during DPF regeneration. If the other If the needle on the gage indicates that the air
light comes on yellow, the vehicle can continue pressure is below 60 psi (415 kPa), the low
running, but at a reduced speed and duration. air warning light will come on. An alarm will also
If the light changes from yellow to red, the DPF sound if this happens.
requires an immediate regeneration. If the DPF The top pointer shows the pressure available
is not regenerated, the check engine light will for the front system, while the bottom pointer
come on and engine power will be reduced. shows pressure for the rear. There should be
See Diesel Particulate Filter on page 87 and no more than 4 psi (28 kPa) difference showing
Reduced Engine Power Light on page 133 between the systems.
for more information. Don’t drive until both pointers are showing at least
120 psi (830 kPa), so you’ll have enough air if
you need to apply your brakes.

136

Downloaded from www.Manualslib.com manuals search engine

 Hourmeter Gage Audio System(s)
To access the engine hourmeter gage press the Determine which radio your vehicle has and then
trip odometer button three times. read the pages following to familiarize yourself
The instrument panel cluster displays the with its features.
accumulated engine run time hours using the
reconfigurable odometer display. The engine run
time hours displays only when the ignition is in {CAUTION:
the LOCK/OFF or ACC/ACCESSORY position
and the trip reset switch is pressed for about This system provides you with far greater
four seconds. access to audio stations and song listings.
When the ignition is in the LOCK/OFF or ACC/ Giving extended attention to entertainment
ACCESSORY position, the instrument panel cluster tasks while driving can cause a crash and
displays the engine accumulated hours for up to you or others can be injured or killed.
30 seconds. The value of the accumulated hours Always keep your eyes on the road and
does not change when the battery is disconnected. your mind on the drive — avoid engaging
The hourmeter resets to 0.0 when 10,000 hours in extended searching while driving.
are accumulated. The instrument panel cluster
begins to reaccumulate the engine run time hours
Keeping your mind on the drive is important for
from 0.0 hours.
safe driving. See Defensive Driving on page 148.
Here are some ways in which you can help
avoid distraction while driving.

137

Downloaded from www.Manualslib.com manuals search engine

 While your vehicle is parked: Setting the Time
• Familiarize yourself with all of its controls.
AM-FM Radio
• Familiarize yourself with its operation.
• Set up your audio system by presetting your Press and hold the DISP button. Press the up
favorite radio stations, setting the tone, and tuning button until the correct hour displays. Press
adjusting the speakers. Then, when driving the down tuning arrow until the correct minute
conditions permit, you can tune to your favorite displays. The time can be set with the ignition
radio stations using the presets and steering on or off.
wheel controls if the vehicle has them. See “Using the Alarm” under AM-FM Radio on
page 139 to set the alarm.
Notice: Before adding any sound equipment
to your vehicle, such as an audio system, Radio with Cassette
CD player, CB radio, mobile telephone,
or two-way radio, make sure that it can be Press and hold the AM FM button. Then press
added by checking with your dealer/retailer. the H button until the correct hour displays. Press
Also, check federal rules covering mobile radio and hold the M button until the correct minute
and telephone units. If sound equipment can displays. The time can be set with the ignition
be added, it is very important to do it properly. on or off.
Added sound equipment may interfere with See “Using the Alarm” under Radio with Cassette
the operation of your vehicle’s engine, radio, on page 142 to set the alarm.
or other systems, and even damage them.
Your vehicle’s systems may interfere with
the operation of sound equipment that
has been added.

138

Downloaded from www.Manualslib.com manuals search engine

 AM-FM Radio Finding a Station
BND (Band): Press this button to switch between
FM or AM. The display shows the selection.
zy (Tune): Press the down z arrow to go
to the previous radio frequency. Press the
up y arrow to go to the next radio frequency.
To seek stations, press and hold either the
Playing the Radio down z or up y arrow for a second or longer.
The radio seeks to the next or previous station.
ON (Power): Press this knob to turn the system
on and off. The radio only seeks stations with a strong signal
that are in the selected band.
VOL (Volume): Turn this knob clockwise or
counterclockwise to increase or to decrease the t (Scan): Press the t button to scan radio
volume. stations. The radio goes to a station, plays for a
few seconds, then goes to the next station.
DISP (Display): Press this knob to switch the Press the t button again to stop scanning.
display between the radio station frequency,
the time, and the alarm status. The radio only scans stations with a strong signal
that are in the selected band.

139

Downloaded from www.Manualslib.com manuals search engine

 PS AS (Preset Scan/Auto Scan): Press this To automatically store the preset pushbuttons,
button for less than two seconds to scan preset perform the following steps:
stations. The radio goes to the first preset station, 1. Turn the radio on.
plays for a few seconds, then goes to the next
preset station. Press this button again to stop 2. Press BND to select FM or AM.
scanning presets. 3. Press and hold the AS button for more than
two seconds. The radio stores, the first
The radio only scans preset stations with a strong
six strongest stations found, onto the radio
signal that are in the selected band.
preset pushbuttons. When that numbered
Setting Preset Stations pushbutton is pressed, the station that was
set, returns.
Up to 12 stations (six FM and six AM) can be
programmed on the six numbered pushbuttons, Setting the Tone (Bass/Treble)
by performing the following steps:
TONE: To adjust the bass, turn the control ring
1. Turn the radio on. behind the ON/VOL knob counterclockwise.
2. Press BND to select FM or AM.
To adjust the treble, turn the control ring behind
3. Tune in the desired station. the ON/VOL knob clockwise. If a station is weak or
4. Press and hold one of the six numbered has static, decrease the treble.
pushbuttons for two seconds or longer.
When that numbered pushbutton is pressed,
Adjusting the Speakers (Balance/Fade)
the station that was set, returns. BAL (Balance): To adjust the balance between
5. Repeat Steps 2 through 4 for each the right and the left speakers, pull the ON/VOL
pushbutton. knob out. Turn the knob to move the sound to the
right or the left speakers. The middle position
balances the sound between the speakers.
Push the knob back in when not in use.
140

Downloaded from www.Manualslib.com manuals search engine

 Using the Timer 5. Press the alarm button, again. The alarm
symbol displays. The alarm sounds at the
H (Timer): The timer on the radio can be used to same time every day.
set a time from 15 minutes up to three hours. 6. To turn the alarm off, press the alarm button.
To set the timer, press the H button. The timer 7. To deactivate the alarm, press the alarm
symbol and 0:00 displays. With each press of this button.
button, the time increases. An alarm sounds for To check the time of the alarm, press the DISP
two minutes, when the time expires. button.
Using the Alarm Using the Wake-Up Timer
# (Alarm): The alarm on the radio can be used to The wake-up timer can be used to turn the radio
activate an alarm at a desired time. on at a specific time, without the key in the ignition.
To set the alarm, perform the following: 1. Press the DISP button until the alarm
symbol displays.
1. Press the DISP button until the alarm symbol
displays. 2. Press the alarm button while the alarm
symbol is flashing, until the letter U displays.
2. Press the alarm button while the alarm
symbol is flashing, until the letter A displays. 3. Press the up tuning arrow to change the hour.
3. Press the up tuning arrow to change the hour. 4. Press the down tuning arrow to change the
minutes. After setting the timer, the display
4. Press the down tuning arrow to change the changes back to the current time.
minutes. After setting the alarm, the display
changes back to the current time. When the set time comes, the radio is
switched on and remains on for one hour.
5. To turn the radio off, press the alarm button.

141

Downloaded from www.Manualslib.com manuals search engine

 Radio with Cassette To seek stations, press and hold either the
down z or up y arrow for a second or longer.
The radio seeks to the next or previous station.
The radio only seeks stations with a strong signal
that are in the selected band.
Finding a Station
AM FM: Press this button to switch between AM
Playing the Radio or FM. The display shows the selection.
SCN (Scan): Press and release this button to
Power: Press the knob located on the upper right scan radio stations. The radio goes to a station,
side of the radio faceplate to turn the system on plays for a few seconds, then goes to the
and off. next station. Press this button again to stop
SW.VOL (Volume): Turn the same knob located scanning.
on the upper right side of the radio clockwise The radio only scans stations with a strong signal
or counterclockwise to increase or to decrease that are in the selected band.
the volume.
zy (Tune): Press the down z arrow to go
to the previous radio frequency. Press the
up y arrow to go to the next radio frequency.

142

Downloaded from www.Manualslib.com manuals search engine

 Setting Preset Stations Setting the Tone (Bass/Treble)
Up to 10 stations (five FM and five AM) can be TONE: To adjust the bass, turn the control ring
programmed on the five numbered pushbuttons, behind the power/volume knob counterclockwise.
by performing the following steps:
To adjust the treble, turn the control ring behind
1. Turn the radio on. the power/volume knob clockwise. If a station
2. Press AM FM to select AM or FM. is weak or has static, decrease the treble.
3. Tune in the desired station. Adjusting the Speakers (Balance/Fade)
4. Press and hold one of the six numbered
pushbuttons for two seconds or longer. PULL BAL (Balance): To adjust the balance
When that numbered pushbutton is pressed, between the right and the left speakers, pull the
the station that was set returns. power/volume knob out. Turn the knob to move
the sound to the right or the left speakers. The
5. Repeat the steps for each pushbutton. middle position balances the sound between the
speakers. Push the knob back in when not in use.

143

Downloaded from www.Manualslib.com manuals search engine

 Using the Alarm Playing a Cassette Tape
U (Alarm): The alarm on the radio can be used The tape player is built to work best with tapes
to activate an alarm at a desired time. that are up to 30 to 45 minutes long on each side.
Tapes longer than that are so thin they may not
To set the alarm, perform the following: work well in this player. The longer side with
1. Press the U button until the alarm symbol the tape visible should face to the right. If you hear
nothing or hear a garbled sound, the tape might
displays.
not be in squarely. Press the Y (eject) button to
2. Press the U button again until the display remove the tape and start over.
flashes.
If the ignition is on and the radio is off, the tape
3. Press the up tuning arrow to change the hour. can be inserted and begins playing.
4. Press the down tuning arrow to change the While the tape is playing, use the VOL, TONE,
minutes. After setting the alarm, the display and BAL controls just as you do for the radio.
changes back to the current time. The radio displays an arrow to show the
5. Press the alarm button, again and the alarm tape direction. The tape player plays the other
symbol displays. The alarm sounds at the side of the tape when it reaches the end.
same time every day. The tape bias is set automatically when a metal or
6. To turn the alarm off, press the U button. chrome tape is inserted.
7. To deactivate the alarm, press the U alarm r PR / [ OG (Fast Forward/Reverse): Press
button. either arrow to either fast forward or reverse the
To check the time of the alarm, press tape, depending on the direction of the tape as
indicated on the display. To stop fast forwarding
the U button.
or reversing, press the other arrow.

144

Downloaded from www.Manualslib.com manuals search engine

 PROG (Program): Press both arrows at the same AM
time to play the other side of the tape. An arrow
appears on the display to show the tape The range for most AM stations is greater than for
playing direction. FM, especially at night. The longer range can cause
station frequencies to interfere with each other. For
AM FM: Press this button to switch between better radio reception, most AM radio stations boost
playing the radio and the tape. The inactive tape the power levels during the day, and then reduce
remains safely inside the radio for future listening. these levels during the night. Static can also occur
when things like storms and power lines interfere
Y (Eject): Press the Y button to eject a with radio reception. When this happens, try
tape. Eject can be activated with the radio off. reducing the treble on your radio.
Cassette tapes can be loaded with the ignition
and radio off if this button is pressed first. FM Stereo
FM stereo gives the best sound, but FM signals
Radio Reception reach only about 10 to 40 miles (16 to 65 km).
Tall buildings or hills can interfere with FM signals,
Frequency interference and static during normal
causing the sound to fade in and out.
radio reception can occur if items such as cell
phone chargers, vehicle convenience accessories,
and external electronic devices are plugged into
the accessory power outlet. If there is interference
or static, unplug the item from the accessory
power outlet.

145

Downloaded from www.Manualslib.com manuals search engine

 Care of the Cassette Tape Player A non-scrubbing action, wet-type cleaner which
uses a cassette with a fabric belt to clean the tape
A tape player that is not cleaned regularly can head can be used. This type of cleaning cassette
cause reduced sound quality, ruined cassettes or a will not eject on its own. A non-scrubbing action
damaged mechanism. Cassette tapes should be cleaner may not clean as thoroughly as the
stored in their cases away from contaminants, scrubbing type cleaner. The use of a non-scrubbing
direct sunlight, and extreme heat. If they are not, action, dry-type cleaning cassette is not
they may not operate properly or may cause failure recommended.
of the tape player.
Cassettes are subject to wear and the sound
The tape player should be cleaned regularly after quality may degrade over time. Always make
every 50 hours of use. If there is a reduction in sure the cassette tape is in good condition before
sound quality, try a known good cassette to see the tape player is serviced.
if the tape or the tape player is at fault. If this other
cassette has no improvement in sound quality, Fixed Mast Antenna
clean the tape player.
For best results, use a scrubbing action, The antenna is located in front of the driver’s
non-abrasive cleaning cassette with pads which side door at the top of the cab. Push the antenna
scrub the tape head as the hubs of the cleaner back in to retract it. The antenna should be
cassette turn. The recommended cleaning retracted when entering low clearance areas.
cassette is available through your dealer.

146

Downloaded from www.Manualslib.com manuals search engine

 Section 4 Driving Your Vehicle
Your Driving, the Road, and Driving at Night ......................................... 165
Your Vehicle ............................................ 148 Driving in Rain and on Wet Roads ............ 166
Defensive Driving ...................................... 148 City Driving ............................................... 169
Drunken Driving ........................................ 149 Freeway Driving ........................................ 170
Control of a Vehicle .................................. 152 Highway Hypnosis ..................................... 172
Braking ...................................................... 152 Hill and Mountain Roads ........................... 172
Hydraulic Brake Systems ........................... 153 Winter Driving ........................................... 174
Antilock Brake System (ABS) .................... 154 If Your Vehicle is Stuck in Sand, Mud,
Braking in Emergencies ............................. 156 Ice, or Snow .......................................... 178
Trailer Brake Hand Control Valve .............. 156 Rocking Your Vehicle to Get It Out ........... 179
Rear Axle Differential Lock Control ............ 157 Tow Hooks ................................................ 179
Traction Control System (TCS) .................. 157 Loading Your Vehicle ................................ 180
Steering .................................................... 159 Towing ........................................................ 182
Off-Road Recovery .................................... 161 Towing Your Vehicle ................................. 182
Passing ..................................................... 161 Trailer Connections (T7/T8 Models Only) .... 187
Loss of Control .......................................... 163

147

Downloaded from www.Manualslib.com manuals search engine

 Your Driving, the Road, and
Your Vehicle {CAUTION:
Defensive driving really means “Be ready
Defensive Driving
for anything.” On city streets, rural roads,
The best advice anyone can give about driving is: or expressways, it means “Always expect
Drive defensively. the unexpected.” Assume that pedestrians
Please start with a very important safety device in or other drivers are going to be careless
your vehicle: Buckle up. See Safety Belts: They and make mistakes. Anticipate what they
Are for Everyone on page 28. might do and be ready. Rear-end collisions
are about the most preventable of
accidents. Yet they are common. Allow
enough following distance. Defensive
driving requires that a driver concentrate
on the driving task. Anything that distracts
from the driving task makes proper
defensive driving more difficult and can
even cause a collision, with resulting
injury. Ask a passenger to help do these
things, or pull off the road in a safe place to
do them. These simple defensive driving
techniques could save your life.

148

Downloaded from www.Manualslib.com manuals search engine

 Drunken Driving Many adults — by some estimates, nearly half
the adult population — choose never to drink
Death and injury associated with drinking and alcohol, so they never drive after drinking.
driving is a national tragedy. It is the number one For persons under 21, it is against the law in
contributor to the highway death toll, claiming every U.S. state to drink alcohol. There are
thousands of victims every year. good medical, psychological, and developmental
Alcohol affects four things that anyone needs to reasons for these laws.
drive a vehicle: The obvious way to eliminate the leading highway
• Judgment safety problem is for people never to drink
alcohol and then drive. But what if people do?
• Muscular Coordination How much is “too much” if someone plans
• Vision to drive? It is a lot less than many might think.
• Attentiveness Although it depends on each person and situation,
here is some general information on the problem.
Police records show that almost half of all motor
vehicle-related deaths involve alcohol. In most The Blood Alcohol Concentration (BAC) of
cases, these deaths are the result of someone who someone who is drinking depends upon four things:
was drinking and driving. In recent years, more • The amount of alcohol consumed
than 16,000 annual motor vehicle-related deaths • The drinker’s body weight
have been associated with the use of alcohol, with
more than 300,000 people injured. • The amount of food that is consumed before
and during drinking
• The length of time it has taken the drinker to
consume the alcohol

149

Downloaded from www.Manualslib.com manuals search engine

 According to the American Medical Association, a It is the amount of alcohol that counts. For
180 lb (82 kg) person who drinks three 12 ounce example, if the same person drank three double
(355 ml) bottles of beer in an hour will end up with martinis (3 ounces or 90 ml of liquor each)
a BAC of about 0.06 percent. The person would within an hour, the person’s BAC would be close
reach the same BAC by drinking three 4 ounce to 0.12 percent. A person who consumes food
(120 ml) glasses of wine or three mixed drinks just before or during drinking will have a somewhat
if each had 1-1/2 ounces (45 ml) of liquors lower BAC level.
like whiskey, gin, or vodka. There is a gender difference, too. Women
generally have a lower relative percentage of body
water than men. Since alcohol is carried in body
water, this means that a woman generally will
reach a higher BAC level than a man of her
same body weight will when each has the
same number of drinks.
The law in most U.S. states, and throughout
Canada, sets the legal limit at 0.08 percent.
In some other countries, the limit is even lower.
For example, it is 0.05 percent in both France
and Germany. The BAC limit for all commercial
drivers in the United States is 0.04 percent.
The BAC will be over 0.10 percent after three
to six drinks (in one hour). Of course, as we have
seen, it depends on how much alcohol is in the
drinks, and how quickly the person drinks them.

150

Downloaded from www.Manualslib.com manuals search engine

 But the ability to drive is affected well below There is something else about drinking and driving
a BAC of 0.10 percent. Research shows that the that many people do not know. Medical research
driving skills of many people are impaired at a BAC shows that alcohol in a person’s system can make
approaching 0.05 percent, and that the effects are crash injuries worse, especially injuries to the
worse at night. All drivers are impaired at BAC brain, spinal cord, or heart. This means that
levels above 0.05 percent. Statistics show that the when anyone who has been drinking — driver
chance of being in a collision increases sharply for or passenger — is in a crash, that person’s chance
drivers who have a BAC of 0.05 percent or above. of being killed or permanently disabled is higher
A driver with a BAC level of 0.06 percent has than if the person had not been drinking.
doubled his or her chance of having a collision. At a
BAC level of 0.10 percent, the chance of this driver
having a collision is 12 times greater; at a level of {CAUTION:
0.15 percent, the chance is 25 times greater!
The body takes about an hour to rid itself of Drinking and then driving is very
the alcohol in one drink. No amount of coffee dangerous. Your reflexes, perceptions,
or number of cold showers will speed that up. attentiveness, and judgment can be
“I will be careful” is not the right answer. What if affected by even a small amount of
there is an emergency, a need to take sudden alcohol. You can have a serious — or
action, as when a child darts into the street? even fatal — collision if you drive after
A person with even a moderate BAC might not
drinking. Please do not drink and drive or
be able to react quickly enough to avoid the
collision. ride with a driver who has been drinking.
Ride home in a cab; or if you are with a
group, designate a driver who will not
drink.

151

Downloaded from www.Manualslib.com manuals search engine

 Control of a Vehicle Average reaction time is about three-fourths of a
second. But that is only an average. It might be less
The following three systems help to control your with one driver and as long as two or three seconds
vehicle while driving — brakes, steering, and or more with another. Age, physical condition,
accelerator. At times, as when driving on snow alertness, coordination and eyesight all play a part.
or ice, it is easy to ask more of those control So do alcohol, drugs and frustration. But even in
systems than the tires and road can provide. three-fourths of a second, a vehicle moving at
Meaning, you can lose control of your vehicle. 60 mph (100 km/h) travels 66 feet (20 m). That
could be a lot of distance in an emergency, so
Braking keeping enough space between your vehicle and
others is important.
See Brake System Warning Light on page 124.
And, of course, actual stopping distances vary
Braking action involves perception time and greatly with the surface of the road, whether it is
reaction time. First, you have to decide to push on pavement or gravel; the condition of the road,
the brake pedal. That is perception time. Then whether it is wet, dry or icy; tire tread; the condition
you have to bring up your foot and do it. That is of the brakes; the weight of the vehicle; the
reaction time. weight of the load; and the amount of brake
force applied.

152

Downloaded from www.Manualslib.com manuals search engine

 Avoid needless heavy braking. Some people Hydraulic Brake Systems
drive in spurts — heavy acceleration followed
by heavy braking — rather than keeping pace with If the engine stops running, or if the primary brake
traffic. This is a mistake. The brakes might not system stops working, your vehicle has a reserve
have time to cool between hard stops. The brakes power assist system to help you slow down. Just
will wear out much faster if you do a lot of slowly and steadily apply the brake pedal until you
heavy braking. If you keep pace with the traffic can safely get off the road. The pedal will seem
and allow realistic following distances, you harder to push down. Do not pump the pedal; the
will eliminate a lot of unnecessary braking. system will not work well that way.
That means better braking and longer brake life. You might find that the steering wheel seems hard
If your vehicle’s engine ever stops while you are to turn when you are turning and braking at the
driving, brake normally but do not pump the brakes. same time. Also, the primary brake warning
If you do, the pedal could get harder to push down. light might come on and the warning tone might
If the engine stops, you will still have some power sound. This is normal because the main hydraulic
brake assist. But you will use it when you brake. brake system and power steering both use the
Once the power assist is used up, it can take longer power steering pump. If this ever happens, let up
to stop and the brake pedal will be harder to push. on the brake pedal a little. When you let up on
the brake pedal in that situation, it lets the steering
get a little more help from the pump.

153

Downloaded from www.Manualslib.com manuals search engine

 Antilock Brake System (ABS)
Your vehicle has the Antilock Brake System
(ABS), an advanced electronic braking system
that will help prevent a braking skid.
When you start the engine and begin to drive
away, ABS will check itself. You might hear
a momentary motor or clicking noise while
this test is going on. This is normal.

If there is a problem
with ABS, this warning
light will stay on.
See Antilock Brake
System Warning Light
on page 127.
Let us say the road is wet and you are driving
safely. Suddenly, an animal jumps out in front of
you. You slam on the brakes and continue braking.
Here is what happens with ABS:
A computer senses that wheels are slowing down.
If one of the wheels is about to stop rolling, the
computer will separately work the brakes at each
wheel.

154

Downloaded from www.Manualslib.com manuals search engine

 ABS can change the brake pressure faster than Remember: ABS does not change the time you
any driver could. The computer is programmed need to get your foot up to the brake pedal
to make the most of available tire and road or always decrease stopping distance. If you get
conditions. This can help you steer around too close to the vehicle in front of you, you will
the obstacle while braking hard. not have time to apply the brakes if that vehicle
suddenly slows or stops. Always leave enough
room up ahead to stop, even though you
have ABS.
Using ABS
Do not pump the brakes. Just hold the brake
pedal down firmly and let antilock work for you.
You might feel the brakes pulsate, or you
might hear air exhausting if your vehicle has
air brakes, but this is normal.

As you brake, the computer keeps receiving

updates on wheel speed and controls braking
pressure accordingly.

155

Downloaded from www.Manualslib.com manuals search engine

 Braking in Emergencies You can apply the trailer brakes a little or apply
them all the way if you have to. Use this control only
With ABS, you can steer and brake at the same when you are driving. Do not use it for parking or to
time. In many emergencies, steering can help you hold the rig on a hill.
more than even the very best braking.

Trailer Brake Hand Control Valve {CAUTION:

If your vehicle has this feature, the control
Using the trailer brake hand control for
is mounted on the floor console.
parking or for holding the vehicle on a hill
This feature lets you may not keep the vehicle from rolling.
apply the trailer brakes This can happen if someone hits the valve
without applying the by accident, or if air pressure bleeds from
tractor brakes. the system. If the vehicle rolls, you or
others could be injured. To park the
vehicle or hold it on a hill, use the
parking brake properly.

156

Downloaded from www.Manualslib.com manuals search engine

 Rear Axle Differential Lock Control Notice: Turning on the inter-axle differential
lock while the rear wheels are spinning
If your vehicle has a freely, as they might on snow or ice, can
controlled traction or damage the axle(s). Turn on this control only
locking differential axle, while the wheels are not spinning freely.
the switch is located
in the center of Traction Control System (TCS)
the instrument panel. Your vehicle may have a traction control system
that limits wheel spin. This is especially useful
in slippery road conditions. The system operates
only if it senses that one or both of the rear wheels
are spinning or beginning to lose traction. When
this happens, the system applies the brake(s)
You’ll see this control on single rear axle vehicles. at the affected wheel(s).
If you’re approaching a slippery surface where The bottom light on the TCS on/off button will
it looks like one or even both wheels may start come on when the TCS is limiting wheel spin.
to slip, you can press the switch to off. It locks You may feel or hear the system working, but this
your rear differential so that power is transmitted is normal. The TCS will function at speeds up
equally to both rear wheels. to about 25 mph (42 km/h).
Let up on the accelerator before you turn on your
rear axle differential lock.

157

Downloaded from www.Manualslib.com manuals search engine

 The TCS may operate on dry roads under some To turn the system on
conditions. When this happens, you may notice or off, press the traction
a reduction in acceleration. This is normal control button located
and doesn’t mean there’s a problem with your on the instrument panel.
vehicle. Examples of these conditions include
a hard acceleration in a turn, an abrupt upshift
or downshift of the transmission or driving
on rough roads.
When the light in the top of the TCS button is
on, the TCS is off and will not limit wheel
spin. Adjust your driving accordingly.
The light in the top of the TCS button will come
on if the TCS is turned off by pressing the If you used the TCS button to turn the system off,
TCS on/off button. the light in the top of the button will come on
The light may also come on if a problem has been and stay on. You can turn the TCS back on at
detected in either the traction control system or any time by pressing the button again; the
the anti-lock brake system. light should go off.
The traction control system automatically comes Adding non-dealer/non-retailer accessories can
on whenever you start your vehicle. To limit wheel affect your vehicle’s performance. See Accessories
spin, especially in slippery road conditions, you and Modifications on page 191 for more
should always leave the system on. But you can information.
turn the traction control system off if you ever need
to. You should turn the system off if your vehicle
ever gets stuck in sand, mud or snow and rocking
the vehicle is required. See Rocking Your Vehicle to
Get It Out on page 179 for more information.
158

Downloaded from www.Manualslib.com manuals search engine

 Steering If there is no traction, inertia will keep the vehicle
going in the same direction. If you have ever
Power Steering tried to steer a vehicle on wet ice, you will
understand this.
If you lose power steering assist because the
engine stops or the system is not functioning, The traction you can get in a curve depends on
you can steer but it will take much more effort. the condition of the tires and the road surface,
the angle at which the curve is banked, and your
On vehicles with hydraulic brakes, the power speed. While you are in a curve, speed is the
steering and main hydraulic brake system both one factor you can control.
use the power steering pump. See Braking
on page 152. Suppose you are steering through a sharp curve.
Then you suddenly accelerate. Both control
Steering Tips systems — steering and acceleration — have
Driving on Curves to do their work where the tires meet the road.
Adding the sudden acceleration can demand too
It is important to take curves at a reasonable much of those places. You can lose control.
speed. See Traction Control System (TCS) on page 157.
A lot of the “driver lost control” accidents What should you do if this ever happens? Ease
mentioned on the news happen on curves. up on the accelerator pedal, steer the vehicle the
Here is why: way you want it to go, and slow down.
Experienced driver or beginner, each of us is Speed limit signs near curves warn that you
subject to the same laws of physics when driving should adjust your speed. Of course, the posted
on curves. The traction of the tires against the speeds are based on good weather and road
road surface makes it possible for the vehicle to conditions. Under less favorable conditions you
change its path when you turn the front wheels. will want to go slower.

159

Downloaded from www.Manualslib.com manuals search engine

 If you need to reduce your speed as you approach
a curve, do it before you enter the curve, while
the front wheels are straight ahead.
Try to adjust your speed so you can “drive”
through the curve. Maintain a reasonable, steady
speed. Wait to accelerate until you are out of
the curve, and then accelerate gently into
the straightaway.
Steering in Emergencies
There are times when steering can be more
effective than braking. For example, you come
over a hill and find a truck stopped in your lane,
or a car suddenly pulls out from nowhere, or An emergency like this requires close attention
a child darts out from between parked cars and a quick decision. If you are holding the
and stops right in front of you. You can avoid steering wheel at the recommended 9 and
these problems by braking — if you can stop in 3 o’clock positions, you can turn it a full
time. But sometimes you cannot; there is not room. 180 degrees very quickly without removing
That is the time for evasive action — steering either hand. But you have to act fast, steer
around the problem. quickly, and just as quickly straighten the
Your vehicle can perform very well in emergencies wheel once you have avoided the object.
like these. First apply the brakes. See Braking The fact that such emergency situations are
on page 152. It is better to remove as much speed always possible is a good reason to practice
as you can from a possible collision. Then steer defensive driving at all times and wear safety
around the problem, to the left or right depending belts properly.
on the space available.

160

Downloaded from www.Manualslib.com manuals search engine

 Off-Road Recovery is nothing in the way, steer so that your vehicle
straddles the edge of the pavement. You can turn
You may find that your right wheels have dropped the steering wheel up to one-quarter turn until
off the edge of a road onto the shoulder while the right front tire contacts the pavement edge.
you are driving. Then turn your steering wheel to go straight down
the roadway.

Passing
The driver of a vehicle about to pass another on a
two-lane highway waits for just the right moment,
accelerates, moves around the vehicle ahead,
then goes back into the right lane again. A simple
maneuver?
Not necessarily! Passing another vehicle on a
two-lane highway is a potentially dangerous move,
since the passing vehicle occupies the same
lane as oncoming traffic for several seconds.
A miscalculation, an error in judgment, or a brief
If the level of the shoulder is only slightly below surrender to frustration or anger can suddenly
the pavement, recovery should be fairly easy. put the passing driver face to face with the worst
Ease off the accelerator and then, if there of all traffic accidents — the head-on collision.

161

Downloaded from www.Manualslib.com manuals search engine

 So here are some tips for passing: • Do not get too close to the vehicle you want
• A vehicle like yours takes a longer time to to pass while you are awaiting an opportunity.
reach passing speed, so you will need a For one thing, following too closely reduces
longer stretch of clear road ahead than you your area of vision, especially if you are
would with a passenger car. following a larger vehicle. Also, you will not
have adequate space if the vehicle ahead
• Drive ahead. Look down the road, to the suddenly slows or stops. Keep back a
sides, and to crossroads for situations reasonable distance.
that might affect your passing patterns. If you
have any doubt whatsoever about making • When it looks like a chance to pass is coming
a successful pass, wait for a better time. up, start to accelerate but stay in the right
lane and do not get too close. Time your move
• Watch for traffic signs, pavement markings, so you will be increasing speed as the time
and lines. If you can see a sign up ahead comes to move into the other lane. If the
that might indicate a turn or an intersection, way is clear to pass, you will have a running
delay your pass. A broken center line start that more than makes up for the distance
usually indicates it is all right to pass, providing you would lose by dropping back. And if
the road ahead is clear. Never cross a solid something happens to cause you to cancel
line on your side of the lane or a double your pass, you need only slow down and drop
solid line, even if the road seems empty of back again and wait for another opportunity.
approaching traffic.
• If other cars are lined up to pass a slow
vehicle, wait your turn. But take care
that someone is not trying to pass you
as you pull out to pass the slow vehicle.

162

Downloaded from www.Manualslib.com manuals search engine

 • Check your vehicle’s mirrors and start the Loss of Control
left lane change signal before moving out
of the right lane to pass. When you are Let us review what driving experts say about what
far enough ahead of the passed vehicle to happens when the three control systems — brakes,
see its front in your vehicle’s passenger steering, and acceleration — do not have enough
side outside mirror, activate the right lane friction where the tires meet the road to do what the
change signal and move back into the driver has asked.
right lane. Remember that an outside convex In any emergency, do not give up. Keep trying to
mirror makes the vehicle you just passed steer and constantly seek an escape route or
seem farther away from you than it really is. area of less danger.
• Try not to pass more than one vehicle
at a time on two-lane roads. Reconsider
Skidding
before passing the next vehicle. In a skid, a driver can lose control of the vehicle.
• Do not overtake a slowly moving vehicle too Defensive drivers avoid most skids by taking
rapidly. Even though the brake lamps are reasonable care suited to existing conditions,
not flashing, it might be slowing down and by not overdriving those conditions.
or starting to turn. But skids are always possible.
• If you are being passed, make it easy for the The three types of skids correspond to your
following driver to get ahead of you. Perhaps vehicle’s three control systems. In the braking
you can ease a little to the right. skid, the wheels are not rolling. In the steering or
cornering skid, too much speed or steering in
a curve causes tires to slip and lose cornering
force. And in the acceleration skid, too much
throttle causes the driving wheels to spin.

163

Downloaded from www.Manualslib.com manuals search engine

 A cornering skid is best handled by easing your While driving on a surface with reduced traction, try
foot off the accelerator pedal. your best to avoid sudden steering, acceleration,
If you have the Traction Control System (TCS), or braking, including reducing vehicle speed by
remember: It helps avoid only the acceleration shifting to a lower gear. Any sudden changes could
skid. See Traction Control System (TCS) on cause the tires to slide. You may not realize the
page 157. If you do not have this system, surface is slippery until your vehicle is skidding.
or if the system is off, then an acceleration Learn to recognize warning clues — such as
skid is also best handled by easing your enough water, ice, or packed snow on the road to
foot off the accelerator pedal. make a mirrored surface — and slow down when
you have any doubt.
Of course, traction is reduced when water, snow,
ice, gravel, or other material is on the road. For If you have the Antilock Brake System (ABS),
safety, you will want to slow down and adjust your remember: It helps avoid only the braking skid.
driving to these conditions. It is important to slow If you do not have ABS, then in a braking
down on slippery surfaces because stopping skid, where the wheels are no longer rolling,
distance will be longer and vehicle control more release enough pressure on the brakes to get
limited. the wheels rolling again. This restores steering
control. Push the brake pedal down steadily
when you have to stop suddenly. As long as the
wheels are rolling, you will have steering control.

164

Downloaded from www.Manualslib.com manuals search engine

 Driving at Night No one can see as well at night as in the daytime.
But as we get older these differences increase.
Night driving is more dangerous than day driving. A 50-year-old driver might require at least twice as
One reason is that some drivers are likely to much light to see the same thing at night as a
be impaired — by alcohol or drugs, with night 20-year-old.
vision problems, or by fatigue.
What you do in the daytime can also affect
Here are some tips on night driving. your night vision. For example, if you spend
• Drive defensively. the day in bright sunshine you are wise to wear
sunglasses. Your eyes will have less trouble
• Do not drink and drive. adjusting to night. But if you are driving, do not
• Adjust the inside rearview mirror to reduce the wear sunglasses at night. They might cut down on
glare from headlamps behind you. glare from headlamps, but they also make a lot
• Since you cannot see as well, slow down and of things invisible.
keep more space between you and other You can be temporarily blinded by approaching
vehicles. headlamps. It can take a second or two, or
• Slow down, especially on higher speed roads. even several seconds, for your eyes to re-adjust
Your vehicle’s headlamps can light up only so to the dark. When you are faced with severe glare,
much road ahead. as from a driver who does not lower the high
beams, or a vehicle with misaimed headlamps,
• In remote areas, watch for animals. slow down a little. Avoid staring directly into
• If you are tired, pull off the road in a safe the approaching headlamps.
place and rest.

165

Downloaded from www.Manualslib.com manuals search engine

 Keep the windshield and all the glass on your Driving in Rain and on Wet Roads
vehicle clean — inside and out. Glare at night
is made much worse by dirt on the glass. Even
the inside of the glass can build up a film caused
by dust. Dirty glass makes lights dazzle and
flash more than clean glass would, making the
pupils of your eyes contract repeatedly.
Remember that the headlamps light up far less of a
roadway when you are in a turn or curve. Keep your
eyes moving; that way, it is easier to pick out dimly
lighted objects. Just as the headlamps should be
checked regularly for proper aim, so should your
eyes be examined regularly. Some drivers suffer
from night blindness — the inability to see in dim
light — and are not even aware of it.

Rain and wet roads can mean driving trouble.

On a wet road, you cannot stop, accelerate,
or turn as well because your tire-to-road
traction is not as good as on dry roads.
And, if your tires do not have much tread
left, you will get even less traction.

166

Downloaded from www.Manualslib.com manuals search engine

 It is always wise to go slower and be cautious if
rain starts to fall while you are driving. The surface
may get wet suddenly when your reflexes are {CAUTION:
tuned for driving on dry pavement.
Wet brakes can cause accidents. They
The heavier the rain, the harder it is to see.
Even if your windshield wiper blades are in good may not work as well in a quick stop and
shape, a heavy rain can make it harder to see may cause pulling to one side. You could
road signs and traffic signals, pavement markings, lose control of the vehicle.
the edge of the road, and even people walking. After driving through a large puddle of
It is wise to keep your wiping equipment in water or a vehicle wash, apply your brake
good shape and keep your windshield washer pedal lightly until your brakes work
fluid reservoir filled with washer fluid. Replace your normally.
windshield wiper inserts when they show signs
of streaking or missing areas on the windshield,
or when strips of rubber start to separate from Driving too fast through large water puddles
the inserts. or even going through some vehicle washes can
cause problems, too. The water may affect
your brakes. Try to avoid puddles. But if you
cannot, try to slow down before you hit them.

167

Downloaded from www.Manualslib.com manuals search engine

 Hydroplaning and badly damage the engine. Never drive
through water that is slightly lower than the
Hydroplaning is dangerous. So much water can underbody of your vehicle. If you cannot avoid
build up under your tires that they can actually ride deep puddles or standing water, drive
on the water. This can happen if the road is wet through them very slowly.
enough and you are going fast enough. When your
vehicle is hydroplaning, it has little or no contact Driving Through Flowing Water
with the road.
Hydroplaning does not happen often. But it can if
your tires do not have much tread or if the pressure {CAUTION:
in one or more is low. It can happen if a lot of water
is standing on the road. If you can see reflections Flowing or rushing water creates strong
from trees, telephone poles, or other vehicles, and forces. If you try to drive through flowing
raindrops dimple the water’s surface, there could be water, as you might at a low water
hydroplaning. crossing, your vehicle can be carried
Hydroplaning usually happens at higher speeds. away. As little as six inches of flowing
There just is not a hard and fast rule about water can carry away a smaller vehicle.
hydroplaning. The best advice is to slow down If this happens, you and other vehicle
when it is raining. occupants could drown. Do not ignore
Driving Through Deep Standing Water police warning signs, and otherwise be
very cautious about trying to drive
Notice: If you drive too quickly through through flowing water.
deep puddles or standing water, water can
come in through the engine’s air intake

168

Downloaded from www.Manualslib.com manuals search engine

 Some Other Rainy Weather Tips City Driving
• Turn on your low-beam headlamps and your
marker and clearance lamps, if your vehicle
has them — not just your parking lamps — to
help make you more visible to others.
• Besides slowing down, allow some extra
following distance. And be especially careful
when you pass another vehicle. Allow yourself
more clear room ahead, and be prepared to
have your view restricted by road spray.
• Have good tires with proper tread depth.
See Tires on page 254.

One of the biggest problems with city streets

is the amount of traffic on them. You will want to
watch out for what the other drivers are doing and
pay attention to traffic signals.

169

Downloaded from www.Manualslib.com manuals search engine

 Here are ways to increase your safety in city Freeway Driving
driving:
• Know the best way to get to where you are
going. Get a city map and plan your trip
into an unknown part of the city just as you
would for a cross-country trip.
• Larger vehicles cannot be driven everywhere
smaller ones can. There are low underpasses,
truck routes and other special situations.
Usually these are well marked, so be sure
to watch for the signs.
• Try to use the freeways that rim and crisscross
most large cities. You will save time and
energy. See Freeway Driving on page 170.
• Treat a green light as a warning signal.
A traffic light is there because the corner
is busy enough to need it. When a light turns
green, and just before you start to move, Mile for mile, freeways — also called thruways,
check both ways for vehicles that have not parkways, expressways, turnpikes, or
cleared the intersection or may be running the superhighways — are the safest of all roads.
red light. But they have their own special rules.

170

Downloaded from www.Manualslib.com manuals search engine

 The most important advice on freeway driving Before changing lanes, check your mirrors.
is: Keep up with traffic and keep to the right. Then use your turn signal.
Drive at the same speed most of the other drivers Once you are moving on the freeway, make
are driving. Too-fast or too-slow driving breaks certain you allow a reasonable following distance.
a smooth traffic flow. Treat the left lane on Expect to move slightly slower at night.
a freeway as a passing lane.
When you want to leave the freeway, move to
At the entrance, there is usually a ramp that leads the proper lane well in advance. If you miss your
to the freeway. If you have a clear view of the exit, do not, under any circumstances, stop
freeway as you drive along the entrance ramp, and back up. Drive on to the next exit.
you should begin to check traffic. Try to determine
where you expect to blend with the flow. Try to The exit ramp can be curved, sometimes quite
merge into the gap at close to the prevailing sharply. The exit speed for cars — but not larger
speed. Switch on your turn signal, check your vehicles — is usually posted. You should go
mirrors, and try to blend smoothly with the more slowly.
traffic flow. Reduce your speed according to your
Once you are on the freeway, adjust your speed speedometer, not to your sense of motion.
to the posted limit or to the prevailing rate if it After driving for any distance at higher speeds,
is slower. Stay in the right lane unless you want you may tend to think you are going slower than
to pass. On some freeways, larger vehicles are not you actually are.
allowed to use some lanes. These places usually
are well-marked.

171

Downloaded from www.Manualslib.com manuals search engine

 Highway Hypnosis Hill and Mountain Roads
Is there actually such a condition as highway
hypnosis? Or is it just plain falling asleep at the
wheel? Call it highway hypnosis, lack of
awareness, or whatever.
When you drive the vehicle for a long distance,
there is something about an easy stretch of road
with the same scenery, along with the hum of the
tires on the road, the drone of the engine, and the
rush of the wind against the vehicle that can make
you sleepy. Do not let it happen to you! If it does,
your vehicle can leave the road in less than a
second, and you could crash and be injured.
What can you do about highway hypnosis? First,
be aware that it can happen.
Then here are some tips:
• Make sure your vehicle is well ventilated, with
a comfortably cool interior. Driving on steep hills or mountains is different
• Keep your eyes moving. Scan the road ahead from driving in flat or rolling terrain.
and to the sides. Check your mirrors and your
instruments frequently.
• If you get sleepy, pull off the road into a rest,
service, or parking area and take a nap, get
some exercise, or both. For safety, treat
drowsiness on the highway as an emergency.

172

Downloaded from www.Manualslib.com manuals search engine

 Here are some tips that can make your drive
through steep country safer:
{CAUTION:
• Keep the vehicle in good shape. Check
all fluid levels and also the brakes, tires,
Coasting downhill in NEUTRAL (N) or with
cooling system, and transmission. These
parts can work hard on mountain roads. the ignition off is dangerous. The brakes
will have to do all the work of slowing
down. They could get so hot that they
{CAUTION: would not work well. You would then have
poor braking or even none going down a
If you do not shift down, the brakes could hill. You could crash. Always have the
get so hot that they would not work well. engine running and your vehicle in gear
You would then have poor braking or when you go downhill.
even none going down a hill. You could
crash. Shift down to let the engine assist • Know how to go down hills. The most important
the brakes on a steep downhill slope. thing to know is this: let your engine do some of
the slowing down. Shift to a lower gear when
you go down a steep or long hill.
• Stay in your own lane when driving on two-lane
roads in hills or mountains. Do not swing wide
or cut across the center of the road. Drive at
speeds that let you stay in your own lane.
• As you go over the top of a hill, be alert. There
could be something in your lane, like a stalled
car or an accident.

173

Downloaded from www.Manualslib.com manuals search engine

 • You might see highway signs on mountains that Driving on Snow or Ice
warn of special problems. Examples are long Most of the time, those places where the tires
grades, passing or no-passing zones, a falling meet the road probably have good traction.
rocks area, winding roads, and special truck
lanes. Be alert to these and take appropriate However, if there is snow or ice between the
action. tires and the road, you can have a very slippery
situation. You have a lot less traction, or grip, and
need to be very careful.
Winter Driving
Here are some tips for winter driving:
• Be sure the vehicle is in good shape
for winter.
• You might want to put winter emergency
supplies in your vehicle.
Include an ice scraper, a small brush or broom,
a supply of windshield washer fluid, a rag, some
winter outer clothing, a small shovel, a flashlight, a
red cloth, and reflective warning triangles. And, if
you will be driving under severe conditions, include
a small bag of sand, a piece of old carpet, or a
couple of burlap bags to help provide traction.
Be sure you properly secure these items in your
vehicle.
Also see Tires on page 254. What is the worst time for this? Wet ice. Very cold
snow or ice can be slick and hard to drive on.

174

Downloaded from www.Manualslib.com manuals search engine

 But wet ice can be even more trouble because it If your vehicle does not have TCS, accelerate
can offer the least traction of all. You can get gently. Try not to break the fragile traction. If you
wet ice when it is about freezing, 32°F (0°C), and accelerate too fast, the drive wheels will spin
freezing rain begins to fall. Try to avoid driving and polish the surface under the tires even more.
on wet ice until salt and sand crews can get there. Unless your vehicle has the Antilock Brake System
Whatever the condition — smooth ice, packed, (ABS), you will want to brake very gently, too. If you
blowing, or loose snow — drive with caution. do have ABS, see Antilock Brake System (ABS) on
If your vehicle has the Traction Control System page 154. ABS improves your vehicle’s stability
(TCS), it will improve your ability to accelerate when when you make a hard stop on a slippery road.
driving on a slippery road. But you can turn the TCS Whether your vehicle has ABS or not, begin
off if you ever need to. You should turn the TCS off stopping sooner than you would on dry pavement.
if your vehicle ever gets stuck in sand, mud, ice, or Without ABS, if you feel your vehicle begin to slide,
snow. See If Your Vehicle is Stuck in Sand, Mud, let up on the brakes a little. Push the brake pedal
Ice, or Snow on page 178. Even if you have TCS, down steadily to get the most traction you can.
slow down and adjust your driving to the road
conditions. Under certain conditions, you might
want to turn the TCS off, such as when driving
through deep snow and loose gravel, to help
maintain vehicle motion at lower speeds. See
Traction Control System (TCS) on page 157.

175

Downloaded from www.Manualslib.com manuals search engine

 Remember, unless your vehicle has ABS, if you If You Are Caught in a Blizzard
brake so hard that the wheels stop rolling, you will
just slide. Brake so the wheels always keep If you are stopped by heavy snow, you could be
rolling and you can still steer. in a serious situation. You should probably stay with
your vehicle unless you know for sure that you are
• Whatever your vehicle’s braking system, allow near help and you can hike through the snow. Here
greater following distance on any slippery road. are some things to do to summon help and keep
• Watch for slippery spots. The road might be yourself and your passengers safe:
fine until you hit a spot that is covered with ice. • Turn on the hazard warning flashers.
On an otherwise clear road, ice patches can
appear in shaded areas where the sun cannot • Tie a red cloth to your mirror arm to alert police
reach, such as around clumps of trees, behind that you have been stopped by the snow.
buildings, or under bridges. Sometimes the • Put on extra clothing or wrap a blanket
surface of a curve or an overpass can remain around you. If you do not have blankets
icy when the surrounding roads are clear. If you or extra clothing, make body insulators
see a patch of ice ahead of you, brake before from newspapers, burlap bags, rags, floor
you are on it. Try not to brake while you are mats — anything you can wrap around yourself
actually on the ice, and avoid sudden steering or tuck under your clothing to keep warm.
maneuvers.

176

Downloaded from www.Manualslib.com manuals search engine

 {CAUTION:
Snow can trap exhaust gases under your
vehicle. This can cause deadly CO (carbon
monoxide) gas to get inside. CO could
overcome you and kill you. You cannot see
it or smell it, so you might not know it is in
your vehicle. Clear away snow from around
the base of your vehicle if any is blocking
your exhaust pipe. And check around again
from time to time to be sure snow does not
collect there.
Open a window just a little on the side of
You can run the engine to keep warm, but be the vehicle that is away from the wind.
careful. This will help keep CO out.

Run your engine only as long as you must.

This saves fuel. When you run the engine, make
it go a little faster than just idle. That is, push the
accelerator slightly. This uses less fuel for the heat
that you get and it keeps the batteries charged.

177

Downloaded from www.Manualslib.com manuals search engine

 You will need well-charged batteries to restart the
vehicle, and possibly for signaling later on with the
headlamps. Let the heater run for a while. {CAUTION:
Then, shut the engine off and close the window
If you let your vehicle’s tires spin at high
almost all the way to preserve the heat. Start
the engine again and repeat this only when you speed, they can explode, and you or
feel really uncomfortable from the cold. But do it others could be injured. And, the
as little as possible. Preserve the fuel as long transmission or other parts of the vehicle
as you can. To help keep warm, you can get can overheat. That could cause an engine
out of the vehicle and do some fairly vigorous compartment fire or other damage. When
exercises every half hour or so until help comes. you are stuck, spin the wheels as little as
possible. Do not spin the wheels above
If Your Vehicle is Stuck in Sand, 35 mph (55 km/h) as shown on the
Mud, Ice, or Snow speedometer.

In order to free your vehicle when it is stuck, you

will need to spin the wheels, but you do not Notice: Spinning the wheels can destroy
want to spin the wheels too fast. The method parts of your vehicle as well as the tires. If you
known as rocking can help you get out when you spin the wheels too fast while shifting the
are stuck, but you must use caution. transmission back and forth, you can destroy
the transmission.

178

Downloaded from www.Manualslib.com manuals search engine

 Rocking Your Vehicle to Get It Out Tow Hooks
First, turn the steering wheel left and right to clear
the area around the front wheels. Turn off any
traction system. See Traction Control System {CAUTION:
(TCS) on page 157. Then shift back and forth
between REVERSE (R) and a forward gear, These hooks, when used, are under a lot
spinning the wheels as little as possible. of force. Always pull the vehicle straight
To prevent transmission wear, wait until the out. Never pull on the hooks at a
wheels stop spinning before shifting gears. sideways angle. The hooks could break
Release the accelerator pedal while you shift, off and you or others could be injured
and press lightly on the accelerator pedal when from the chain or cable snapping back.
the transmission is in gear. By slowly spinning the
wheels in the forward and reverse directions, you
will cause a rocking motion that could free your Notice: Never use tow hooks to tow the
vehicle. If that does not get your vehicle out after vehicle. Your vehicle could be damaged and it
a few tries, it might need to be towed out. If your would not be covered by warranty.
vehicle does need to be towed out, see Towing
Your Vehicle on page 182. If your vehicle has tow hooks, the hooks are at the
front of the vehicle. You may need to use them
if you are stuck off-road and need to be pulled
to some place where you can continue driving.

179

Downloaded from www.Manualslib.com manuals search engine

 Loading Your Vehicle Never exceed the GVWR for your vehicle, or the
GAWR for either the front or rear axle.
It is the responsibility of the Final Stage
manufacturer to install a Certification label on And, if you do have a heavy load, spread it out.
your vehicle. This label shows how much weight
your vehicle can properly carry. It may also
show the size of the vehicle’s original tires, {CAUTION:
and the inflation pressures needed to obtain
the gross weight capacity of your vehicle. This is Do not load your vehicle any heavier than
called the Gross Vehicle Weight Rating (GVWR). the Gross Vehicle Weight Rating (GVWR),
The tire information could also be shown on a or either the maximum front or rear Gross
separate Tire Information label. Axle Weight Rating (GAWR). If you do,
The GVWR includes the weight of the vehicle, parts on your vehicle can break, and it
all occupants, fuel, and cargo. can change the way your vehicle handles.
The Certification label also tells you the maximum These could cause you to lose control
weight for the front and rear axles, called the and crash. Also, overloading can shorten
Gross Axle Weight Rating (GAWR). To find out the life of your vehicle.
the actual loads on your front and rear axles,
go to a weigh station and weigh your vehicle.
Your dealer can help you with this. Be sure
to spread out your load equally on both sides
of the center line.

180

Downloaded from www.Manualslib.com manuals search engine

 Using heavier suspension components to get
added durability might not change the weight
ratings. Ask your dealer to help you load your {CAUTION:
vehicle the right way.
Things you put inside your vehicle can
Notice: Overloading your vehicle may cause strike and injure people in a sudden stop
damage. Repairs would not be covered by your
or turn, or in a crash.
warranty. Do not overload your vehicle.
• Put things in the cargo area of your
If you put things inside your vehicle — like vehicle. Try to spread the weight
suitcases, tools, packages, or anything else — they evenly.
go as fast as the vehicle goes. If you have to stop or • Never stack heavier things, like
turn quickly, or if there is a crash, they keep going. suitcases, inside the vehicle so that
some of them are above the tops of
the seats.
• Do not leave an unsecured child
restraint in your vehicle.
• When you carry something inside the
vehicle, secure it whenever you can.
• Do not leave a seat folded down
unless you need to.

181

Downloaded from www.Manualslib.com manuals search engine

 Towing
CAUTION: (Continued)
Towing Your Vehicle • Working on air brakes without first
using the release studs to compress
the springs can lead to injury. Never
{CAUTION: work on the air brakes chambers
without first using the release studs
To help avoid serious personal injury to to compress the brake springs.
you or others: • When the brake springs are manually
• Never let passengers ride in a vehicle compressed, you will have no brakes.
that is being towed. Release your air-operated parking
• Never tow faster than safe or posted brakes manually only to tow the
speeds. vehicle. Never drive the vehicle with
• Never tow with damaged parts not the brakes released.
fully secured.
• Never get under your vehicle after it Consult your dealer/retailer or a professional
has been lifted by the tow truck. towing service if you need to have your vehicle
• Always secure the vehicle on each towed. They can provide the right equipment
side with separate safety chains when and know-how to tow it without damage.
towing it. See Roadside Assistance Program on page 332.
CAUTION: (Continued) Before you do anything, turn on the hazard
warning flashers (if they have not been damaged).
See Hazard Warning Flashers on page 102 for
more information.

182

Downloaded from www.Manualslib.com manuals search engine

 When you call, tell the towing service: Towing the Vehicle with the Front Bumper
• That your vehicle has rear-wheel drive. Removed
• The make, model and year of your vehicle. 1. Remove the front bumper.
• Whether you can still move the shift lever. 2. Connect and lock the lift chains to the front
axle, outside of the spring anchor plates as
• If there was an accident, what was damaged.
shown.
When the towing service arrives, let the tow
operator know that this manual contains towing
instructions. The operator may want to see them.
Here are specific towing instructions:
Towing Your Vehicle From the Front
(Front Wheels Off the Ground)
Before Towing
Block the rear wheels of the disabled vehicle. On
vehicles with air brakes, release the emergency
brake system by compressing the brake chamber
springs as outlined in this section. (This is to
prevent the possibility of the emergency brake
being applied during towing.) 3. Connect the lift chains to the tow bar and
On vehicles with hydraulic brakes, release the raise the tow bar until lift chain slack has
parking brake fully by moving the lever to been taken up.
the fully-released position. 4. Raise the vehicle to the required height.

183

Downloaded from www.Manualslib.com manuals search engine

 Rear Axle Before Towing
1. Disconnect the propshaft at the rear axle. Block the wheels of the disabled vehicle. On
2. Secure the propshaft to the frame or the vehicles with air brakes, release the emergency
crossmember. brake system by compressing the brake chamber
springs as outlined in this section. (This is to
After Towing prevent the possibility of the emergency brake
1. Block the rear wheels and install the being applied during towing.)
propshafts. On vehicles with hydraulic brakes, release
2. Check for proper phasing of universal joints. the parking brake fully by moving the lever
to the fully-released position.
3. Apply the emergency brake system before
disconnecting from the towing vehicle. If there is damage or suspected damage to
the axle(s), remove the axle shafts. Cover the
4. Check and fill the rear axle with oil as hub openings to prevent the loss of lubricant or
required. entry of dirt or foreign objects.
Towing Your Vehicle From the Front After Towing
(All Wheels On the Ground) 1. Block the rear wheels and install axle shafts
Your vehicle may be towed on all wheels provided and/or propshafts.
the steering is working. Remember that the power 2. Check for proper phasing of universal joints.
brakes and power steering will not have power
assist. Vehicles with air brakes will not have brakes. 3. Apply the parking brake system before
There must be a tow bar installed between the disconnecting from the towing vehicle.
towing vehicle and the disabled vehicle. 4. Check and fill rear axle with oil as required.

184

Downloaded from www.Manualslib.com manuals search engine

 Towing Your Vehicle From the Rear pressure from both systems, the parking brakes
(Rear Wheels Off the Ground) will have automatically engaged. The tow operator
can release the brakes manually by using the
Before Towing following steps. Then your vehicle can be towed
Secure the steering wheel to maintain a with all wheels or only the rear wheels on the
straight-ahead position. Make certain that the front ground.
axle is not loaded above the front axle Gross 1. Block the wheels of the vehicle.
Axle Weight Rating (GAWR) as indicated on the
vehicle’s Certification Label. See Loading Your
Vehicle on page 180 for more information.
After Towing
1. Block the rear wheels and release the
steering wheel.
2. Apply the parking brake system before
disconnecting from the towing vehicle.
3. Check and fill the rear axle with oil as
required.
Releasing Air-Operated Parking Brakes
If your vehicle has air brakes, you could have a
special towing problem. If your vehicle has to 2. Remove the release stud and nut from the
be towed because of a complete loss of air side of the brake chamber. Some chambers
have studs which are visible at all times.

185

Downloaded from www.Manualslib.com manuals search engine

 3. Remove the rubber 6. Turn the stud nut
cap from the rear of clockwise several
the chamber. turns to release
the brakes. Follow
the same procedure
to release the
other brake
or brakes.

4. Put the release stud, nut and flat washer into 7. At the repair facility, apply air pressure of at
the chamber. least 70 psi (480 kPa) to the brake chambers,
5. Turn the stud clockwise one quarter of a turn. either from an external air supply or the
vehicle’s air system.
8. Turn the stud nut counterclockwise several
turns. Remove the stud from the chamber.
9. Replace the stud and washer and tighten the
nut into the side of the chamber.
10. Replace the rubber cap.

186

Downloaded from www.Manualslib.com manuals search engine

 Trailer Connections Heavy-Duty Trailer Wiring Package
(T7/T8 Models Only) Your vehicle may have an eight-wire trailer towing
harness. This harness, with a seven-pin universal
If your vehicle has these trailer connections, they heavy-duty trailer connector, is attached to a
are located at the rear of the cab for a tractor bracket on the platform hitch.
and at the rear of the chassis when towing
a trailer. There will be an air connection and The Center High-Mounted Stoplamp (CHMSL)
an electrical connection. wire is tied next to the trailer wiring harness for use
with a trailer.
Be sure that the couplings to the trailer are made
correctly. The eight-wire harness contains the following
trailer circuits:
Air Connections
• Yellow: Left Stop/Turn Signal
If you are not connecting the trailer air line • Dark Green: Right Stop/Turn Signal
connections to another piece of equipment,
be sure to replace their protective caps. • Brown: Taillamps
Electrical Connections • White: Ground
• Light Green: Back-up Lamps
This system is a seven-wire cable that will connect
to the trailer, supplying power to the trailer’s • Light Blue: CHMSL
lighting system. When not in use, it is stored • Red: Battery Feed
in the trailer air-hose storage bracket.
• Dark Blue: Trailer Brake

187

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

188

Downloaded from www.Manualslib.com manuals search engine

 Section 5 Service and Appearance Care
Service ........................................................ 191 Power Steering Fluid ................................. 225
Accessories and Modifications ................... 191 Windshield Washer Fluid ........................... 226
California Proposition 65 Warning .............. 192 Brakes ...................................................... 227
Doing Your Own Service Work .................. 193 Battery ...................................................... 235
Engine Fan Breakage ................................ 194 Jump Starting ............................................ 236
Fuel ............................................................. 195 Rear Axle .................................................... 241
Diesel Engine Fuel .................................... 195 Rear Axle Shift Motor ................................ 242
What Fuel to Use ...................................... 195 Cab Tilting .................................................. 242
Very Cold Weather Operation .................... 198 Before You Tilt the Cab ............................ 242
Water in Fuel ............................................ 198 Tilting the Cab .......................................... 243
Running Out of Fuel .................................. 203 Lowering the Cab ...................................... 245
Filling the Tank ......................................... 204 Lifting the Front Panel ............................... 247
Filling a Portable Fuel Container ............... 205
Noise Control System ................................. 248
Checking Things Under the Hood .............. 206 Tampering with Noise Control System
Engine Oil ................................................. 206 Prohibited .............................................. 248
Engine Oil Life System .............................. 209
Engine Air Cleaner/Filter ............................ 211 Bulb Replacement ....................................... 250
Automatic Transmission Fluid .................... 213 Windshield Wiper Blade Replacement ....... 250
Manual Transmission Fluid ........................ 214 Other Service Items .................................... 251
Hydraulic Clutch ........................................ 215 Fuel Filter .................................................. 251
Engine Coolant .......................................... 216 Primary Fuel Filter and Water Separator .... 252
Coolant Surge Tank Pressure Cap ............ 219 Front Wheel Bearings with
Engine Overheating ................................... 219 Oil-Filled Hubs ....................................... 253
Cooling System ......................................... 221
189

Downloaded from www.Manualslib.com manuals search engine

 Section 5 Service and Appearance Care
Tires ............................................................ 254 Sheet Metal Damage ................................. 273
Inflation - Tire Pressure ............................. 255 Finish Damage .......................................... 273
Wheel Loading .......................................... 256 Underbody Maintenance ............................ 273
Dual Tire Operation ................................... 256 Chemical Paint Spotting ............................ 274
When It Is Time for New Tires .................. 257 Vehicle Care/Appearance Materials ............ 274
Different Size Tires and Wheels ................ 258 Vehicle Identification .................................. 275
Wheel Alignment and Tire Balance ............ 259 Vehicle Identification Number (VIN) ........... 275
Tightening the Wheel Nuts ........................ 259
Wheel Replacement .................................. 263 Electrical System ........................................ 276
If a Tire Goes Flat .................................... 265 Add-On Electrical Equipment ..................... 276
Headlamp Wiring ....................................... 276
Appearance Care ........................................ 267 Windshield Wiper Fuses ............................ 276
Cleaning the Inside of Your Vehicle .......... 267 Fusible Links ............................................. 276
Fabric/Carpet ............................................. 268 Power Windows and Other
Instrument Panel, Vinyl, and Other Power Options ....................................... 277
Plastic Surfaces ..................................... 269 Fuses and Circuit Breakers ....................... 277
Care of Safety Belts .................................. 270 Instrument Panel Fuse Block ..................... 277
Weatherstrips ............................................ 270 Maxi-Fuse Block ........................................ 281
Washing Your Vehicle ............................... 270 Relay Center ............................................. 282
Cleaning Exterior Lamps/Lenses ................ 271
Finish Care ............................................... 271 Capacities and Specifications .................... 285
Windshield and Wiper Blades .................... 272 Normal Maintenance Replacement Parts .... 288
Aluminum Wheels ...................................... 272 Engine Drive Belt Routing ......................... 289
Tires ......................................................... 273

190

Downloaded from www.Manualslib.com manuals search engine

 Service Accessories and Modifications
Your dealer knows your vehicle best and wants Adding non-dealer accessories to your vehicle can
you to be happy with it. We hope you will go affect its performance and safety. Such things as,
to your dealer for all your service needs. You airbags, braking, stability, ride and handling,
will get genuine GM parts and GM-trained emissions systems, aerodynamics, durability, and
and supported service people. electronic systems like anti-lock brakes, traction
control, and stability control could be affected.
We hope you will want to keep your GM vehicle all
Some non-dealer accessories could even cause
GM. Genuine GM parts have one of these marks:
malfunction or damage to parts and systems and
would not be covered by the vehicle warranty.
GM Accessories are designed to complement
and function with other systems on your vehicle.
Your GM dealer can accessorize your vehicle
using genuine GM Accessories. When you go to
your GM dealer and ask for GM Accessories,
you will know that GM-trained and supported
service technicians will perform the work using
genuine GM Accessories.

191

Downloaded from www.Manualslib.com manuals search engine

 Aftermarket Engine Performance system, transmission, and drivetrain. Damage,
Enhancement Products and failure, or reduced life of the engine, transmission,
emission system, drivetrain, or other vehicle
Modifications components caused by aftermarket engine
Some aftermarket engine performance products performance enhancement products or
and modifications promise a way to increase the modifications may not be covered under
horsepower and torque levels of your vehicle’s your vehicle warranty.
powertrain. You should be aware that these
products could have harmful effects on the California Proposition 65 Warning
performance and life of the engine, exhaust
emission system, transmission, and drivetrain. Most motor vehicles, including this one, contain
The engines, transmissions, and drivetrains have and/or emit chemicals known to the State of
been designed and built to offer industry leading California to cause cancer and birth defects
durability and performance in the most demanding or other reproductive harm. Engine exhaust,
applications. Engine power enhancement products many parts and systems (including some inside
may enable the engine to operate at horsepower the vehicle), many fluids, and some component
and torque levels that could damage, create failure, wear by-products contain and/or emit these
or reduce the life of the engine, engine emission chemicals.

192

Downloaded from www.Manualslib.com manuals search engine

 Doing Your Own Service Work If you want to do some of your own service work,
you will want to use the proper service manual.
It tells you much more about how to service
your vehicle than this manual can. To order the
{CAUTION: proper service manual, see Service Publications
Ordering Information on page 338.
You can be injured and your vehicle could
You should keep a record with all parts receipts
be damaged if you try to do service work
and list the mileage and the date of any service
on a vehicle without knowing enough work you perform. See Part D: Maintenance
about it. Record on page 323.
• Be sure you have sufficient
knowledge, experience, the proper
replacement parts, and tools
before you attempt any vehicle
maintenance task.
• Be sure you wait until the engine and
any attaching parts have sufficiently
cooled before you tilt the cab to service
the vehicle.
• Be sure to use the proper nuts, bolts,
and other fasteners. English and metric
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.

193

Downloaded from www.Manualslib.com manuals search engine

 Engine Fan Breakage
CAUTION: (Continued)

{CAUTION: Winter Fronts, Grille Covers or

Obstructions:
Changing the Fan Drive Ratio or Engine Winter Fronts, grille covers or other add-on
Governed Speed: equipment causing obstructions in front or
If you change the fan drive ratio or behind the fan should not be used on this
increase the governed speed of the vehicle. If this causes the fan to eventually
engine, you may increase stress and the break apart while it is rotating, the pieces
fan could eventually fail. If the fan breaks can cause severe injury to anyone nearby,
apart while it is rotating, pieces can cause such as a service technician working on
severe injury to anyone — such as a the engine, and of course the pieces can
service technician — who is nearby. severely damage the vehicle.
And, of course, the pieces can severely
damage the vehicle. Do not change the
fan drive ratio or increase the governed
speed of the vehicle without getting the
necessary information from your dealer.
CAUTION: (Continued)

194

Downloaded from www.Manualslib.com manuals search engine

 Fuel What Fuel to Use
Notice: Use of diesel fuel other than Ultra
Diesel Engine Fuel Low Sulfur Diesel (15 ppm sulfur maximum)
Notice: Diesel fuel or fuel additives not or engine oil other than low ash CJ-4 oil
recommended in this manual could damage will cause permanent damage to the DPF
your fuel system and engine. Your warranty and related components. This damage
would not cover this damage. And: would not be covered by your warranty.
• Diesel fuel that has been mixed with The emission control system requires the use of
engine oil or automatic transmission fluid diesel fuel with ultra low-sulfur (0.0015% by weight,
could damage your engine and emission or 15 ppm, maximum) content. Both Ultra Low
controls. Sulfur Diesel and Low Sulfur Diesel fuels are
• Aftermarket diesel fuel additives are not available in the United States and Ultra Low Sulfur
tested by General Motors. Some additives, Diesel fuel is available in Canada. However, only
particularly those which contain alcohol higher sulfur diesel fuel is available in Mexico.
or water emulsifiers, may damage your At a minimum, the diesel fuel you use should meet
fuel system. If you believe that unique the latest version of ASTM specification D 975
circumstances call for a fuel additive to (Grades No. 2-D or No. 1-D S15 commonly known
be used, consult your dealer for advice. as Ultra Low Sulfur diesel) in the United States.
• If you ever run out of diesel fuel, it can be In addition, the Engine Manufacturers Association
(EMA) has identified properties of an improved
difficult to restart your engine. To avoid diesel fuel for better engine performance and
this, never let your tank get empty. durability. Diesel fuels corresponding to the EMA
If gasoline is ever accidentally added to the fuel Recommended Guideline on Premium Diesel Fuel
tank, to avoid severe engine damage, do not run (FQP-1A) could provide better starting, less noise,
the engine until the fuel tank can be drained. and better vehicle performance. If there are
If you run out of fuel, Running Out of Fuel on questions about the fuel you are using, contact
page 203 tells you how to restart your engine. your fuel supplier.
195

Downloaded from www.Manualslib.com manuals search engine

 In the United States, for best results use No. 2-D Because of the cleansing properties of biodiesel,
diesel fuel year-round (above and below freezing switching from straight diesel to a biodiesel
conditions) as oil companies blend No. 2-D fuel to blend can prematurely restrict the fuel filter with
address climate differences. No. 1-D diesel fuel can normal deposits in the fuel system. A fuel filter
be used in very cold temperatures (when it stays replacement might be required sooner than
below 0°F or −18°C); however, it will produce a the recommended interval.
power and fuel economy loss. Avoid the use of
No. 1-D diesel fuel in warm or hot climates. It can Diesel fuel can foam when you fill the tank. This
result in stalling, poor starting when the engine is can cause the automatic pump nozzle to shut
hot, and could damage the fuel injection system. off, even though the tank is not full. If this happens,
It is acceptable to use diesel fuel containing up to just wait for the foaming to stop and then try
5% biodiesel (B5), but the final blended fuel must filling the tank more slowly. See Filling the Tank
meet the same specification, ASTM D 975 (Grades on page 204.
No. 2-D or No. 1-D S15 commonly known as Ultra
Low Sulfur diesel), as other fuels used in your
vehicle, and the biodiesel used for making this fuel {CAUTION:
must meet the latest version of ASTM specification
D 6751. Biodiesel is produced from vegetable oils Heat coming from the engine can cause
or animal fat that have been chemically modified to the fuel to expand and force the fuel out
reduce the possibility of damage to the fuel system of the tank. If something ignites the fuel,
and engine. Higher concentration (i.e., greater a fire could start and people could be
than B5) biodiesel-containing fuels or the use of
unmodified bio-oils blended into diesel fuel at any burned. To help avoid this, try filling the
concentration is not recommended and could tank more slowly and fill the fuel tank
damage the fuel system and engine. Such damage only until the automatic nozzle shuts off.
would not be covered by your warranty. If there are Do not try to top it off.
questions about the biodiesel-containing fuels you
are using, contact your fuel supplier.
196

Downloaded from www.Manualslib.com manuals search engine

 What Fuel to Use in Canada Canadian fuels are blended for seasonal changes.
Diesel Type “A” fuel is blended for better cold
Notice: Use of diesel fuel other than Ultra weather starting (below 0°F or −18°C); however,
Low Sulfur Diesel (15 ppm sulfur maximum) you might notice some power and fuel economy
or engine oil other than low ash CJ-4 oil loss. If Type “A” fuel is used in warmer
will cause permanent damage to the DPF temperatures, stalling and hard starting may
and related components. This damage occur. Diesel Type “B” fuel is blended for
would not be covered by your warranty. temperatures above 0°F (−18°C).
The emission control system requires the use It is acceptable to use diesel fuel containing
of diesel fuel with ultra low-sulfur (0.0015% up to 5% biodiesel (B5), but the final blended
by weight, or 15 ppm, maximum) content. Both fuel must meet the same specification,
Ultra Low Sulfur Diesel and Low Sulfur Diesel fuels CAN/CGSB-3.517 (ULS) in Canada, as other fuels
are available in the United States and Ultra Low used in your vehicle, and the biodiesel used for
Sulfur Diesel fuel is available in Canada. However, making this fuel must meet the latest version
only higher sulfur diesel fuel is available in of ASTM specification D 6751. Biodiesel is
Mexico. produced from vegetable oils or animal fat that
At a minimum, the diesel fuel you use should meet have been chemically modified to reduce the
the latest version of specification CAN/CGSB-3.517 possibility of damage to the fuel system and
(ULS) in Canada. In addition, the Engine engine. Higher concentration (i.e., greater than
Manufacturers Association (EMA) has identified B5) biodiesel-containing fuels or the use of
properties of an improved diesel fuel for better unmodified bio-oils blended into diesel fuel at
engine performance and durability (FQP-1A). any concentration is not recommended and
Diesel fuels corresponding to the EMA description could damage the fuel system and engine.
could provide better starting, less noise, and better Such damage would not be covered by your
vehicle performance. If there are questions about warranty. If there are questions about the
the fuel you are using, contact your fuel supplier. biodiesel-containing fuels you are using,
contact your fuel supplier.
197

Downloaded from www.Manualslib.com manuals search engine

 Very Cold Weather Operation Notice: If there is water in your diesel fuel
and the weather is warm or humid, fungus
Follow the instructions listed previously under the and bacteria can grow in the fuel. They
heading “What Fuel to Use.” can damage your fuel system. A diesel fuel
Notice: Never use home heating oil or biocide can be used to sterilize your fuel
gasoline in your diesel engine. They can system. However, your fuel system may still
cause engine damage. need to be cleaned. Your dealer/retailer
can advise you of the appropriate solution.
In cold weather, your fuel filter may become If your fuel tank needs to be purged to remove
clogged (waxed). To unclog it, move the vehicle water, see your dealer/retailer or a qualified
to a warm garage area and warm the filter to technician. Improper purging can damage your
between 32°F and 50°F (0°C to 10°C). You will fuel system.
not need to replace it. Additional information on
the fuel filter follows. Sometimes, water can be pumped into your fuel
tank along with your diesel fuel. This can happen if
a service station does not regularly inspect and
Water in Fuel clean its fuel tanks, or if it gets contaminated fuel
from its suppliers.
If this happens, a
{CAUTION: water-in-fuel indicator
light will come on in the
Diesel fuel containing water is still instrument panel. If it
flammable. You could be burned. If you does, the water must
ever try to drain water from your fuel, be drained.
keep sparks, flames and smoking
materials away from the mixture. Your dealer/retailer can show you how to do this.

198

Downloaded from www.Manualslib.com manuals search engine

 If the light comes on, use this chart to determine Water In Fuel Light (cont’d)
what action to take.
Problem Recommended Action
Water In Fuel Light Light stays on
Problem Recommended Action immediately after Fuel tank purging is
refueling, and a large required. See your
Light comes on Drain water from the fuel amount of water was dealer/retailer for
intermittently. filter. possibly pumped into assistance.
the fuel tank.
Drain the fuel filter
immediately. If no water Notice: If you drive when this warning
Light stays on at
can be drained and the
temperatures above indicator is on, you can damage your fuel
light stays on, see your
freezing.
dealer/retailer for injection system and your engine. If the
assistance. indicator comes on right after you refuel,
it means water was pumped into your fuel
Drain the fuel filter tank. Turn off your engine immediately.
immediately. If no water Then, have the water drained at once.
can be drained, water
Light stays on at may be frozen in the The frequency of water draining or element
temperatures below water drain system or in replacement is determined by the contamination
freezing. the fuel lines. Move the level in the fuel. Inspect or service the collection
vehicle to a warm location bowl for water daily and replace the element
to thaw out, and then as shown in the Maintenance Schedule. See
drain the filter system. Scheduled Maintenance on page 295 for change
interval information.

199

Downloaded from www.Manualslib.com manuals search engine

 To drain water, do the following: 4. Remove the bowl from the filter element.
1. Loosen the Clean the bowl and the O-ring gland and
self-venting drain save them for re-use.
to empty the bowl 5. Lubricate the O-ring with clean diesel fuel or
of water. motor oil and place it in the bowl gland.
6. Spin the bowl onto the new filter element
snugly by hand. Do not use tools to tighten
them together.
7. Lubricate the filter top seal with clean diesel
fuel or motor oil.
8. Fill the filter element/bowl assembly with clean
diesel fuel and attach it onto the mounting
head. Hand tighten an additional one-third to
2. Tighten the drain. Run the engine and check one-half turn after full seal contact is made.
for leaks. 9. Complete the priming procedure. See “Fuel
To replace the element, do the following: Priming” following.
1. Disconnect the element electrical connector 10. Start your engine and check that there are
from the bowl. no leaks.
2. Loosen the self-venting drain to empty the If the water-in-fuel light comes on again after
bowl of water. driving a short distance or if the engine runs rough
or stalls, a large amount of water has probably
3. Remove the filter element from the mounting been pumped into the fuel tank. The fuel tank
head with the bowl connected. should be purged.

200

Downloaded from www.Manualslib.com manuals search engine

 Fuel Priming For vehicles with cruise control, you can prime the
vehicle and remove the air from the fuel system.
In order for the diesel engine fuel system to work The following procedure will show you how:
properly, the fuel lines must be full of fuel and
contain no air. If air gets into the fuel lines, it will
be necessary to prime the fuel lines to eliminate air
before operating the vehicle.
Air can get into the fuel lines if any of the following
happen:
• The vehicle runs out of fuel.
• The fuel filter is removed for servicing or
replacement.
• The fuel lines are removed or disconnected
for servicing.
• The fuel filter water drain valve is opened
while the engine is running.
1. Make sure there is fuel in the fuel tank.
Air in the fuel lines will not harm the engine or the
vehicle. However, the engine may not be able 2. Make sure the specified fuel filter is properly
to start until the fuel system is primed and the installed.
air is removed. 3. Make sure the fuel lines are securely
connected.
4. Make sure the fuel filter is cool to the touch.
5. Use a clean cloth to remove dirt and oil
from the fuel filter head and breather valve.

201

Downloaded from www.Manualslib.com manuals search engine

 6. Use the palm of your hand to repeatedly 9. Tighten the fuel filter breather screw (2) to the
press and release the plunger (1) at the specified torque, 4.9 Y (43 in. lbs).
top of the fuel filter priming pump. Continue 10. Use the palm of your hand to press and
until the plunger resistance becomes firm. This release the plunger (1) at the top of the
may take from 20 to 100 times, depending fuel filter priming pump about 20 more times.
upon fuel tank location. This sends fuel to the engine.
7. Turn the fuel filter breather valve screw (2) left 11. Use a clean cloth to remove any fuel from the
(counterclockwise) several turns to open the fuel filter and surrounding area.
breather valve.
12. Start the engine and allow it to idle for a
8. Use the palm of your hand to repeatedly few minutes.
press and release the plunger (1) at the
top of the fuel filter priming pump until fuel 13. Check the fuel filter for leakage.
begins to seep from the breather valve.

202

Downloaded from www.Manualslib.com manuals search engine

 Running Out of Fuel 2. Follow the fuel priming procedure earlier in
this section to prime the fuel filter.
If the diesel engine stalls and you think that you
3. Close the air bleed valve.
have run out of fuel, do this to restart your engine:
4. Turn the ignition key to START for 10 to
15 seconds at a time until your engine
{CAUTION: starts. If the engine tries to run, but does
not run smoothly, increase the rpm a
little using the accelerator pedal. This
Diesel fuel is flammable. It could start a
will help force air through the system.
fire if it gets on hot engine parts. You
could be burned. Do not let too much fuel Your check engine light may come on if the
flow from the air bleed valve, and wipe up vehicle has run out of fuel. This light may stay
any spilled fuel with a cloth. on for a few drive cycles after the condition
is corrected, but will eventually clear itself.

1. If you are parked on a level surface, add at

least 2 gallons (7.6 liters) of fuel. However, if
you are parked on a slope, you may need
to add up to 5 gallons (18.9 liters) of fuel.

203

Downloaded from www.Manualslib.com manuals search engine

 Filling the Tank
{CAUTION:
{CAUTION: Fuel can spray out on you if you open the
fuel cap too quickly. If you spill fuel and
Fuel vapor burns violently and a fuel fire then something ignites it, you could be
can cause bad injuries. To help avoid badly burned. This spray can happen if
injuries to you and others, read and follow your tank is nearly full, and is more likely
all the instructions on the pump island. in hot weather. Open the fuel cap slowly
Turn off your engine when you are and wait for any hiss noise to stop. Then
refueling. Do not smoke if you are near unscrew the cap all the way.
fuel or refueling your vehicle. Do not use
cellular phones. Keep sparks, flames, and
smoking materials away from fuel. Do not When replacing the fuel cap, turn it clockwise until
leave the fuel pump unattended when it is tight.
refueling your vehicle. This is against the
law in some places. Do not re-enter the {CAUTION:
vehicle while pumping fuel. Keep children
away from the fuel pump; never let
If a fire starts while you are refueling, do
children pump fuel.
not remove the nozzle. Shut off the flow
of fuel by shutting off the pump or by
The fuel cap may be on either or both sides of notifying the station attendant. Leave
your vehicle, depending upon option content. the area immediately.
To remove the cap, turn it slowly counterclockwise.

204

Downloaded from www.Manualslib.com manuals search engine

 Notice: If you need a new fuel cap, be sure
to get the right type. Your dealer/retailer CAUTION: (Continued)
can get one for you. If you get the wrong type,
it may not fit properly. This may cause your the fuel vapor. You can be badly burned
malfunction indicator lamp to light and and your vehicle damaged if this occurs.
may damage your fuel tank and emissions To help avoid injury to you and others:
system. See Malfunction Indicator Lamp
on page 130.
• Dispense fuel only into approved
containers.
• Do not fill a container while it is inside
Filling a Portable Fuel Container a vehicle, in a vehicle’s trunk, pickup
bed, or on any surface other than the
ground.
{CAUTION: • Bring the fill nozzle in contact with
the inside of the fill opening before
Never fill a portable fuel container while operating the nozzle. Contact should
it is in your vehicle. Static electricity be maintained until the filling is
discharge from the container can ignite complete.
• Do not smoke while pumping fuel.
CAUTION: (Continued) • Do not use a cellular phone while
pumping fuel.

205

Downloaded from www.Manualslib.com manuals search engine

 Checking Things Under In order to get an accurate reading, the engine
should be at normal operating temperature, so that
the Hood the oil is warm, and the vehicle must be on level
ground.
Engine Oil 1. If the engine is at normal operating
temperature and the oil is warm, turn off the
Checking Engine Oil engine and allow at least five minutes for
It is a good idea to check the engine oil level the oil to drain back into the oil pan. If you
every time you get fuel. do not do this, the oil dipstick might not show
the actual level.
The engine oil dipstick If the engine has not been run long enough
is located behind the to bring it up to normal operating temperature
cab on the driver side of and the oil is cool, turn off the engine and
the vehicle. It can be allow 30 minutes for the oil to drain back into
reached without the oil pan. If you do not do this, the oil
tilting the cab. dipstick might not show the actual level.
2. Pull out the dipstick and clean it with a
paper towel or a cloth, then push it back
in all the way.
3. Remove the dipstick again, keeping the tip
down, and check the oil level.

206

Downloaded from www.Manualslib.com manuals search engine

 When to Add Engine Oil This section explains what kind of oil to use. For
engine oil crankcase capacity, see Capacities
Notice: Do not add too much oil. Keep the oil and Specifications on page 285.
level between the ADD and FULL marks on
the dipstick. Under normal engine operation, Be sure to add enough
the engine oil level can increase above the oil to put the level
FULL mark as a result of DPF regeneration. somewhere in the proper
A small increase in the oil level is normal. operating range. Push
If the engine has so much oil that the oil level the dipstick all the way
reaches the wider portion (A) on the dipstick, back in when you are
the engine oil must be changed as soon through.
as possible or the engine could be damaged.
If the oil is below the
ADD mark on the
dipstick, you need to add
at least one quart/liter of
oil. But you must use the
right kind.

207

Downloaded from www.Manualslib.com manuals search engine

 What Kind of Engine Oil to Use
Look for three things:
• CJ-4
Oils designated as API CJ-4 are required for
your vehicle. The CJ-4 designation can appear
either alone or in combination with other
American Petroleum Institute (API)
designations, such as API CJ-4/SL.
These letters show API levels of quality.
Notice: Use only engine oils that have the
designation CJ-4 for the diesel engine. Failure
to use the recommended oil can result in
engine damage not covered by your warranty.

208

Downloaded from www.Manualslib.com manuals search engine

 • SAE 10W-40 Engine Oil Additives
As shown in the viscosity chart, SAE 10W-40 Do not add anything to the oil. The recommended
is best for your vehicle. When it is very oils with the API service symbol are all you
cold, below 0°F (−18°C), you should use need for good performance and engine protection.
SAE 5W-40 to improve cold starting.
These numbers on the oil container show When to Change Engine Oil (Vehicles
its viscosity, or thickness. Do not use other Without the Engine Oil Life System)
viscosity oils such as SAE 10W-30 or
Change the engine oil and filter every 15,000 miles
SAE 20W-50.
(24 000 km), or every 12 months, or every
This doughnut-shaped 750 hours of engine operation, whichever occurs
logo (symbol) is used on first. See Scheduled Maintenance on page 295.
most oil containers to
help you select the Engine Oil Life System
correct oil. It means that
the oil has been certified When to Change Engine Oil
by the American
If your vehicle has the Engine Oil Life System,
Petroleum Institute.
it has a computer system that lets you know
when to change the engine oil and filter. This is
based on injection timing, engine load and engine
temperature, and not on mileage. Based on driving
Look for this on the oil container, and use only conditions, the mileage at which an oil change will
those oils that display this logo. be indicated can vary considerably. For the oil life
system to work properly, you must reset the system
every time the oil is changed.

209

Downloaded from www.Manualslib.com manuals search engine

 When the system has calculated that oil life has How to Reset the Engine Oil Life
been diminished, it will indicate that an oil change System
is necessary. A change engine oil light will
come on. See Change Engine Oil Light on The Engine Oil Life System calculates when to
page 132. Change the oil as soon as possible change the engine oil and filter based on vehicle
within the next 600 miles (1 000 km) or 30 hours use. Whenever the oil is changed, reset the
of engine operation, whichever occurs first. It system so it can calculate when the next oil
is possible that, if you are driving under the best change is required. If a situation occurs where
conditions, the oil life system might not indicate you change the oil prior to a change engine oil
that an oil change is necessary for over a light being turned on, reset the system.
year. However, the engine oil and filter must be To reset the Engine Oil Life System:
changed at least once a year and at this time the
system must be reset. Your dealer/retailer has 1. Turn the ignition key to ON with the
trained service people who will perform this work engine off.
using genuine parts and reset the system. It is 2. Fully press and release the accelerator pedal
also important to check the oil regularly and keep slowly three times within 10 seconds.
it at the proper level. If the change engine oil light flashes for
If the system is ever reset accidentally, you must five seconds, the system is resetting.
change the oil at 3,000 miles (5 000 km), or 3. Turn the key to LOCK.
150 hours of engine operation, whichever occurs
first, since your last oil change. Remember to If the change engine oil light comes back on
reset the oil life system whenever the oil is when you start your vehicle, the Engine Oil Life
changed. System has not reset. Repeat the procedure.

210

Downloaded from www.Manualslib.com manuals search engine

 What to Do with Used Oil Engine Air Cleaner/Filter
Used engine oil contains certain elements that can
be unhealthy for your skin and could even cause
cancer. Do not let used oil stay on your skin for
very long. Clean your skin and nails with soap and
water, or a good hand cleaner. Wash or properly
dispose of clothing or rags containing used engine
oil. See the manufacturer’s warnings about the use
and disposal of oil products.
Used oil can be a threat to the environment. If you
change your own oil, be sure to drain all the oil from
the filter before disposal. Never dispose of oil by
putting it in the trash, pouring it on the ground, into
sewers, or into streams or bodies of water. Instead,
recycle it by taking it to a place that collects used
oil. If you have a problem properly disposing of The engine air cleaner/filter is located behind the
used oil, ask your dealer/retailer, a service station, cab on the passenger’s side of the vehicle.
or a local recycling center for help.

211

Downloaded from www.Manualslib.com manuals search engine

 When to Inspect the Engine Air To inspect the air cleaner/filter, remove the filter
Cleaner/Filter from the vehicle and lightly shake the filter to
release loose dust and dirt. If the filter remains
caked with dirt, a new filter is required.
To inspect or replace the filter and reset the
indicator, if equipped, do the following:

The filter change indicator will let you know when

the filter should be replaced. If you are driving
in dusty/dirty conditions inspect the filter each oil
change.

How to Inspect the Engine Air

Cleaner/Filter 1. Remove all three screws and carefully remove
Locate the filter change indicator, if equipped. the filter cover.
When the change indicator turns black or is in the 2. Inspect or replace the engine air cleaner/filter.
red/orange change zone, replace the filter and
reset the indicator. 3. Be sure that all three screws are tightened
securely when reinstalling the filter cover.

212

Downloaded from www.Manualslib.com manuals search engine

 Automatic Transmission Fluid
{CAUTION: When to Check
Operating the engine with the air A good time to check your automatic transmission
cleaner/filter off can cause you or others fluid level is when the engine oil is checked.
to be burned. The air cleaner not only See your Allison Automatic Transmission
Operator’s Manual to find out when to change
cleans the air; it helps to stop flames if
your transmission fluid and filters.
the engine backfires. If it is not there
and the engine backfires, you could be How to Check and What to Use
burned. Do not drive with it off, and be
The Allison Automatic Transmission Operator’s
careful working on the engine with the Manual that came with the vehicle shows how
air cleaner/filter off. to check the automatic transmission fluid and
what fluid to use.
Notice: If the air cleaner/filter is off, a backfire Automatic Transmission External Filter
can cause a damaging engine fire. And, dirt
can easily get into your engine, which will Your automatic transmission filter requires
damage it. Always have the air cleaner/filter periodic replacement.
in place when you are driving. Consult the Allison Automatic Transmission
Operator’s Manual that came with the vehicle
for proper change intervals.

213

Downloaded from www.Manualslib.com manuals search engine

 Manual Transmission Fluid To check the transmission fluid level, do the
following:
When to Check 1. Remove the filler plug.
A good time to have it checked is when the 2. Check to be sure that the lubricant level is up
engine oil is checked. Refer to the Maintenance to the bottom of the fill opening. On heavy
Schedule to find out when to check and change duty transmissions, an inch of oil level equals
your manual transmission fluid. See Scheduled about one gallon of fluid.
Maintenance on page 295. 3. If the fluid level is good, reinstall the plug
How to Check and What to Use and be sure it is fully seated. If the fluid
level is low, add more fluid as described in
Check the fluid level only when your engine is off, the next steps. Refer to the Maintenance
the vehicle is parked on a level place, and the Schedule to determine what kind of fluid to
transmission is cool enough for you to rest use. See Part C: Recommended Fluids
your fingers on the transmission case. and Lubricants on page 321.

214

Downloaded from www.Manualslib.com manuals search engine

 How to Add Fluid When to Check and What to Use
To add transmission fluid, do the following: The hydraulic clutch
1. Remove the filler plug. fluid reservoir is located
behind the front
2. Add fluid at the filler plug hole. Add only
panel on the driver’s
enough fluid to bring the fluid level up to
side of the vehicle.
the bottom of the fill opening. Refer to the
Maintenance Schedule to determine the proper
fluid to use. See Part C: Recommended Fluids
and Lubricants on page 321.
3. Reinstall the filler plug. Be sure the plug is
fully seated.
Refer to the Maintenance Schedule to determine
Hydraulic Clutch how often you should check the fluid level in
your clutch master cylinder reservoir and for the
It is not necessary to regularly check clutch fluid
proper fluid. See Part B: Owner Checks and
unless you suspect there is a leak in the system.
Services on page 315 and Part C: Recommended
Adding fluid will not correct a leak.
Fluids and Lubricants on page 321 for more
A fluid loss in this system could indicate a information.
problem. Have the system inspected and repaired.

215

Downloaded from www.Manualslib.com manuals search engine

 How to Check and Add Fluid A 50/50 mixture of clean, drinkable water and
DEX-COOL® coolant will:
The proper fluid should be added if the fluid level
is not between the MAX (Maximum) and MIN • Give freezing protection down
(Minimum) marks. to −34°F (−37°C).
• Give boiling protection up to 265°F (129°C).
Engine Coolant
• Protect against rust and corrosion.
The cooling system in your vehicle is filled with • Help keep the proper engine temperature.
DEX-COOL® engine coolant. This coolant is
designed to remain in your vehicle for five years or • Let the warning lights and gages work as
150,000 miles (240 000 km), whichever occurs they should.
first, if you add only DEX-COOL® extended Notice: Using coolant other than
life coolant. DEX-COOL® may cause premature engine,
The following explains your cooling system and heater core or radiator corrosion. In addition,
how to add coolant when it is low. If you have the engine coolant may require changing
a problem with engine overheating, see Engine sooner, at 30,000 miles (50 000 km) or
Overheating on page 219. 24 months, whichever occurs first. Any repairs
would not be covered by your warranty. Always
use DEX-COOL® (silicate-free) coolant in your
vehicle.

216

Downloaded from www.Manualslib.com manuals search engine

 What to Use Notice: If you use an improper coolant
mixture, your engine could overheat and be
Use a mixture of one-half clean, drinkable water badly damaged. The repair cost would not be
and one-half DEX-COOL® coolant which will covered by your warranty. Too much water
not damage aluminum parts. If you use this coolant in the mixture can freeze and crack the engine,
mixture, you do not need to add anything else. radiator, heater core, and other parts.
If you have to add coolant more than four times a
{CAUTION: year, have your dealer/retailer check your
cooling system.
Adding only plain water to your cooling Notice: If you use extra inhibitors and/or
system can be dangerous. Plain water, or additives in your vehicle’s cooling system,
some other liquid such as alcohol, can you could damage your vehicle. Use only the
boil before the proper coolant mixture will. proper mixture of the engine coolant listed
Your vehicle’s coolant warning system is in this manual for the cooling system. See Part
C: Recommended Fluids and Lubricants on
set for the proper coolant mixture. With
page 321 for more information.
plain water or the wrong mixture, your
engine could get too hot but you would
not get the overheat warning. Your engine
could catch fire and you or others could
be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL® coolant.

217

Downloaded from www.Manualslib.com manuals search engine

 Checking Coolant The vehicle must be on a level surface. When
your engine is cold, the coolant level should be at
The coolant surge tank the COLD FILL mark or higher.
pressure cap can be
accessed without tilting If the low coolant
the cab. It is located light comes on in the
behind the cab on instrument panel cluster
the driver’s side of and stays on, it means
the vehicle. you are low on engine
coolant.

See Low Coolant Warning Light on page 129 for

further information.
{CAUTION:
Turning the surge tank pressure cap when
the engine and radiator are hot can allow
steam and scalding liquids to blow out
and burn you badly. Never turn the surge
tank pressure cap — even a little — when
the engine and radiator are hot.

218

Downloaded from www.Manualslib.com manuals search engine

 Adding Coolant Coolant Surge Tank Pressure Cap
If you need more coolant, add the proper The surge tank pressure cap is located behind the
DEX-COOL® coolant mixture at the surge tank, cab on the driver’s side of the vehicle.
but only when the engine is cool.
Notice: Your vehicle’s surge tank pressure cap
is designed for use with medium-duty cooling
{CAUTION: systems only. If the surge tank pressure cap is
not tightly installed, coolant loss and possible
You can be burned if you spill coolant engine damage may occur. Be sure the cap is
properly and tightly secured.
on hot engine parts. Coolant contains
ethylene glycol, and it will burn if the
engine parts are hot enough. Do not Engine Overheating
spill coolant on a hot engine. You will find an engine coolant temperature
warning gage, as well as a low coolant warning
light, on your vehicle’s instrument panel. See
When replacing the pressure cap, make sure it is
Engine Coolant Temperature Gage on page 128
hand-tight and fully seated.
and Low Coolant Warning Light on page 129
for more information.
Your vehicle also has a check gages warning
light on the instrument panel. See Check Gages
Warning Light on page 134 for more information.

219

Downloaded from www.Manualslib.com manuals search engine

 If Steam Is Coming From Your Engine If No Steam Is Coming From Your
Engine
{CAUTION: An overheat warning, along with a low coolant light,
can indicate a serious problem. See Low Coolant
Warning Light on page 129 for more information.
Steam from an overheated engine can
burn you badly, even if you just open the If you get an engine overheat warning with no
hood. Stay away from the engine if you low coolant light, but see or hear no steam,
the problem may not be too serious. Sometimes
see or hear steam coming from it. Just
the engine can get a little too hot when you:
turn it off and get everyone away from
the vehicle until it cools down. Wait until • Climb a long hill on a hot day.
there is no sign of steam or coolant • Stop after high-speed driving.
before you open the hood. • Idle for long periods in traffic.
If you keep driving when your engine is If you get the overheat warning with no sign of
overheated, the liquids in it can catch fire. steam, try this for a minute or so:
You or others could be badly burned. 1. In heavy traffic, let the engine idle in
Stop your engine if it overheats, and get NEUTRAL while stopped. If it is safe to
out of the vehicle until the engine is cool. do so, pull off the road, shift to PARK (P)
or NEUTRAL and let the engine idle.
Notice: If your engine catches fire because 2. Turn on your heater to full hot at the highest
you keep driving with no coolant, your vehicle fan speed and open the windows as
can be badly damaged. The costly repairs necessary.
would not be covered by your warranty. 3. If climbing a hill, downshift to raise engine and
fan speeds.

220

Downloaded from www.Manualslib.com manuals search engine

 If you no longer have the overheat warning, Cooling System
you can drive. Just to be safe, drive slower for
about 10 minutes. If the warning does not
come back on, you can drive normally.
{CAUTION:
If the warning continues and you have not
stopped, pull over, stop, and park your vehicle If your vehicle has air conditioning, the
right away.
auxiliary electric fan under the hood can
If there is still no sign of steam, you can push start up even when the engine is not
down the accelerator until the engine speed is running and can injure you. Keep hands,
about twice as fast as normal idle speed for at least clothing and tools away from any
three minutes while you are parked. If you still have underhood electric fan.
the warning, turn off the engine and get everyone
out of the vehicle until it cools down.
You may decide not to lift the hood but to get If the coolant inside the coolant surge tank is
service help right away. boiling, do not do anything else until it cools down.
The vehicle should be parked on a level surface.

221

Downloaded from www.Manualslib.com manuals search engine

 When the engine is cold, the coolant level Notice: Using coolant other than DEX-COOL®
should be at the COLD FULL mark. If it is not, may cause premature engine, heater core,
you may have a leak at the pressure cap or in or radiator corrosion. In addition, the engine
the radiator hoses, heater hoses, radiator, water coolant could require changing sooner,
pump, or somewhere else in the cooling system. at 30,000 miles (50 000 km) or 24 months,
whichever occurs first. Any repairs would
not be covered by your warranty. Always use
{CAUTION: DEX-COOL® (silicate-free) coolant in your
vehicle.
Heater and radiator hoses, and other How to Add Coolant to the Coolant
engine parts, can be very hot. Do not
Surge Tank
touch them. If you do, you can be burned.
If you have not found a problem yet, but the
Do not run the engine if there is a leak.
coolant level is not at the COLD FULL mark,
If you run the engine, it could lose all add a 50/50 mixture of clean, drinkable water and
coolant. That could cause an engine fire, DEX-COOL® coolant at the coolant surge tank, but
and you could be burned. Get any leak be sure the cooling system, including the coolant
fixed before you drive the vehicle. surge tank pressure cap, is cool before you do it.
See Engine Coolant on page 216 for more
information.
If there seems to be no leak, start the engine
again. The engine cooling fan speed should
increase when idle speed is doubled by pushing
the accelerator pedal down. If it does not,
your vehicle needs service. Turn off the engine.

222

Downloaded from www.Manualslib.com manuals search engine

 If no coolant is visible in the surge tank, add
coolant as follows:
{CAUTION:
{CAUTION: Adding only plain water to your cooling
system can be dangerous. Plain water, or
Steam and scalding liquids from a hot some other liquid such as alcohol, can
cooling system can blow out and burn boil before the proper coolant mixture will.
you badly. They are under pressure, and if Your vehicle’s coolant warning system is
you turn the coolant surge tank pressure set for the proper coolant mixture. With
cap — even a little — they can come out at plain water or the wrong mixture, your
high speed. Never turn the cap when the engine could get too hot but you would
cooling system, including the coolant not get the overheat warning. Your engine
surge tank pressure cap, is hot. Wait for could catch fire and you or others could
the cooling system and coolant surge be burned. Use a 50/50 mixture of clean,
tank pressure cap to cool if you ever drinkable water and DEX-COOL® coolant.
have to turn the pressure cap.
Notice: In cold weather, water can freeze and
crack the engine, radiator, heater core and
other parts. Use the recommended coolant
and the proper coolant mixture.

223

Downloaded from www.Manualslib.com manuals search engine

 {CAUTION:
You can be burned if you spill coolant
on hot engine parts. Coolant contains
ethylene glycol and it will burn if the
engine parts are hot enough. Do not
spill coolant on a hot engine.

1. You can remove the coolant surge tank

pressure cap when the cooling system,
including the coolant surge tank pressure cap
and upper radiator hose, is no longer hot. 3. Fill the coolant surge tank with the proper
Turn the pressure cap slowly counterclockwise mixture, to the COLD FULL mark.
about one full turn.
If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
2. Then keep turning the pressure cap slowly,
and remove it.

224

Downloaded from www.Manualslib.com manuals search engine

 Power Steering Fluid
See Scheduled Maintenance on page 295 to
determine when to check your power steering fluid.
How To Check Power Steering Fluid
Check your power steering fluid only when
the engine is warm. If the engine is not warm,
you probably will not get an accurate reading.
If the fluid level is
between the MIN
(Minimum) and MAX
(Maximum) marks,
4. With the coolant surge tank pressure cap off, you have enough. If you
start the engine and let it run until you can need fluid, add only
feel the upper radiator hose getting hot. enough of the proper
Watch out for the engine cooling fan. fluid to bring it into
By this time, the coolant level inside the coolant view in the sight glass.
surge tank may be lower. If the level is lower,
add more of the proper mixture to the coolant
surge tank until the level reaches slightly above
the COLD FULL mark.
If your power steering fluid level is low,
5. Then replace the pressure cap. Be sure the this can cause the brake or service brake
pressure cap is hand-tight and fully seated. soon warning lights to come on.

225

Downloaded from www.Manualslib.com manuals search engine

 If either light remains on after you have added Windshield Washer Fluid
power steering fluid to the proper level, then shut off
the engine for 10 seconds. This should reset the What to Use
brake warning lights. If one or both lights stay on
though, see “Hydraulic Brake System Warning When you need windshield washer fluid, be sure
Lights” under Brake System Warning Light on to read the manufacturer’s instructions before
page 124 for more information. use. If you will be operating your vehicle in an area
where the temperature may fall below freezing,
What to Use use a fluid that has sufficient protection against
freezing.
To determine what kind of fluid to use, see
Part C: Recommended Fluids and Lubricants on Adding Washer Fluid
page 321.
Open the cap with the
Notice: When adding power steering fluid or washer symbol on it.
making a complete fluid change, always use the Add washer fluid
proper fluid. Failure to use the proper fluid can until the tank is full.
cause leaks and damage hoses and seals.

The reservoir is located behind the front panel on

the driver’s side of the vehicle.

226

Downloaded from www.Manualslib.com manuals search engine

 Notice: Brakes
• When using concentrated washer fluid, Brake Fluid
follow the manufacturer’s instructions
for adding water. If your vehicle has
hydraulic brakes, there
• Do not mix water with ready-to-use washer
is a brake master
fluid. Water can cause the solution to
cylinder.
freeze and damage your washer fluid tank
and other parts of the washer system.
Also, water does not clean as well
as washer fluid.
• Fill the washer fluid tank only
three-quarters full when it is very cold.
This allows for fluid expansion if freezing Refer to the Maintenance Schedule to determine
occurs, which could damage the tank if it is when to check the brake fluid.
completely full.
• Do not use engine coolant (antifreeze) in
your windshield washer. It can damage
{CAUTION:
the vehicle’s windshield washer system
and paint. Do not add brake fluid before you check
the level. If you do, you could get too much
brake fluid. Brake fluid could spill on the
hot engine and it can catch fire. You could
be burned and your vehicle could be
damaged. See “Checking Brake Fluid”
in this section.

227

Downloaded from www.Manualslib.com manuals search engine

 Checking Brake Fluid
Apply the brake pedal several times with the {CAUTION:
ignition off. Then clean one of the reservoir caps
and the area around the cap, and remove it. With the wrong kind of fluid in the brake
The fluid level should be system, the brakes may not work well.
even with the bottom This could cause a crash. Always use the
ring of the filler opening. proper brake fluid.
If it is low, add enough
fluid to fill the reservoir
to the proper level. Notice:
• Using the wrong fluid can badly damage
brake system parts. For example, just a few
drops of mineral-based oil, such as engine
oil, in the brake system can damage brake
system parts so badly that they will have to
be replaced. Do not let someone put in the
wrong kind of fluid, and do not use DOT-5
What to Add silicone brake fluid.
Use the proper fluid listed in the Maintenance • If you spill brake fluid on your vehicle’s
Schedule. Use new brake fluid from a sealed painted surfaces, the paint finish can be
container only. damaged. Be careful not to spill brake fluid
on your vehicle. If you do, wash it off
Always clean the brake fluid reservoir cap and the immediately. See Washing Your Vehicle
area around the cap before removing it. This on page 270.
helps keep dirt from entering the reservoir.

228

Downloaded from www.Manualslib.com manuals search engine

 Four-Wheel and Six-Wheel Drum Brake Adjustment on Air Braked Vehicles
Brakes (Air Only) Your vehicle has automatic slack adjusters.
The brake drums should be removed and Every time you make a brake stop, the brakes
inspected each time the tires are removed for automatically adjust for wear. Slack adjusters
rotation or changing. When you have the should never be manually adjusted to correct
front brakes replaced, have the rear brakes excessive brake chamber pushrod stroke.
inspected, too. Excessive brake chamber pushrod stroke means
that the brake system needs to be serviced by
Brake linings should always be replaced as a qualified service technician.
complete axle sets.
Notice: Do not manually adjust automatic
Brake Pedal Travel slack adjusters. Manual adjustment of the
automatic slack adjusters can result in a
See your dealer/retailer if the brake pedal does
degradation of the slack adjuster performance
not return to normal height, or if there is a
over time. If the brake chamber pushrod stroke
rapid increase in pedal travel. This could be
is out of adjustment, the brake system needs to
a sign that brake service might be required.
be serviced by a qualified service technician.
Brake Adjustment
Every time you make a brake stop, the brakes
adjust for wear.

229

Downloaded from www.Manualslib.com manuals search engine

 Four-Wheel Disc Brakes balance between the front and rear brakes can
(Hydraulic Only) change — for the worse. The braking performance
you have come to expect can change in many other
Your vehicle has four-wheel disc brakes. ways if someone puts in the wrong replacement
Some driving conditions or climates can cause a brake parts.
brake squeal when the brakes are first applied Air Brake Systems
or lightly applied. This does not mean something
is wrong with the brakes. If your vehicle has air brakes, it is important to
get rid of moisture in the system. Moisture
Brake linings should always be replaced as will damage the system if it is not removed daily.
complete axle sets.
There are two ways to do this. One is automatic
Replacing Brake System Parts through the air brake vehicle’s air dryer with
The braking system on a vehicle is complex. intregal automatic moisture ejector that purges
Its many parts have to be of top quality and work air from the system through a self-contained
well together if the vehicle is to have really good reservoir. The other way to drain moisture from
braking. Your vehicle was designed and tested with the air brake system is to manually activate drain
top-quality brake parts. When you replace parts of valves at each reservoir. Drain the air reservoirs
the braking system — for example, when the brake occasionally to be sure the air dryer is working
linings wear down and you need new ones put properly.
in — be sure you get new approved replacement Drain them at full system pressure. To be sure
parts. If you do not, the brakes might not work you are at full pressure, check the air pressure
properly. For example, if someone puts in brake gage. It should read at least 100 psi (692 kPa).
linings that are wrong for your vehicle, the

230

Downloaded from www.Manualslib.com manuals search engine

 Air Dryer Electric Air Compressor
If your vehicle has air brakes, it will have an air Your vehicle may have an electric air compressor.
dryer. This collects and removes dirt, moisture, or This compressor is used to run options that
other foreign matter from the air prior to entering require pressurized air, such as air horn, air
the brake system. The air dryer also serves as a seat, exhaust restrictor, or an exhaust brake.
moisture ejector. It automatically ejects the The air compressor is used when vehicles do
moisture when the compressor cycles. The integral not have an air brake system.
purge tank has a manual drain valve that must be The air supply for
drained every day. See “Air Brake Systems” for the this system must be
manual drain procedure. The dryer is mounted on maintained by releasing
the driver side frame rail. the drain valve to
eject any moisture
The dryer has a filter that that could have built
you need to change at up in the system.
intervals. See Scheduled
Maintenance on
page 295 for more
about servicing this filter.

It is recommended that this system be drained on

a weekly basis.
Clutch Pedal Free Travel
Normal clutch pedal free play is 1.5 to 2 inches
(38 to 51 mm) measured from the floorboard.
If the free play is less than 1.25 inches (32 mm),
adjustment is required.
231

Downloaded from www.Manualslib.com manuals search engine

 Chassis Lubrication

232

Downloaded from www.Manualslib.com manuals search engine

 Item Number Item Remarks
Brake Camshaft*** One fitting each (apply sparingly).
1 Brake Caliper Rails$ For caliper rails, apply Aero Shell #5 Lubricant.
2 Steering Column Slip Joint** One fitting.
3 Steering Drag Link Ends One fitting each end.
4 Steering Column U-Joints One fitting each joint.
5 Pivot Points and Hinges Apply chassis lubricant.
6 Slack Adjuster*** One fitting.
7 Brake Cam Roller Pins*** Apply engine oil.
One fitting each side, lower bushing.
8 Front Steering Knuckles (Hand-operated grease gun only.)
Hand-pack upper bearing.
9 Front Wheel Bearings* Hand-pack or lubricate.
10 Steering Tie Rod Ends One fitting each end.
11 Spring Slip Pads** (Multi-leaf Only) Apply chassis lubricant.
12 Clutch Release Bearing** Cup or fitting.
13 Battery Terminal (except “ST” type) Keep coated with petroleum jelly.
14 Parking Brake Bell Crank**, $ One fitting.

233

Downloaded from www.Manualslib.com manuals search engine

 Item Number Item Remarks
15 Transmission* Fill to level of filler plug.
15 Transmission-Automatic*,**,† Check fluid level.

16 Propshaft Slip Joints One fitting each joint; lubricate with

GM Part No. 1051344 Wheel Bearing Lubricant.
One fitting each joint (1480 and 1550 Series);
lubricate with GM Part No. 1051344 Wheel Bearing
17 Propshaft U-joints Lubricant. Two fittings each joint (1610 Series and
larger); lubricate with GM Part No. 1051344 Wheel
Bearing Lubricant.
18 Rear Wheel Bearings* Hand-pack or lubricate.
19 Rear Axle* Fill to level of filler plug.
20 Parking Brake Clevis Pin$ Apply chassis lubricant.
21 Master Cylinder$ Fill 1/4 inch (6 mm) below opening.
22 Parking Brake Lever Pivot**, $ Apply chassis lubricant.
23 Clutch Release Cross Shaft** One fitting each.
* Refer to Maintenance Schedule.
** Applies to some vehicles.
*** Applies to air brakes only.
† Refer to Allison Transmission® Operator’s Manual.
$ Applies to hydraulic brakes only.

234

Downloaded from www.Manualslib.com manuals search engine

 Battery Vehicle Storage
Your vehicle has two maintenance free batteries. If you are not going to drive your vehicle for
When it is time for a new battery, see your 25 days or more, remove the black, negative (−)
dealer/retailer for one that has the replacement cable from each battery. This will help keep
number shown on the original battery’s label. the batteries from running down.
Warning: Battery posts, terminals, and related
accessories contain lead and lead compounds,
chemicals known to the State of California {CAUTION:
to cause cancer and reproductive harm.
Wash hands after handling. Batteries have acid that can burn you and
gas that can explode. You can be badly
hurt if you are not careful. See Jump
Starting on page 236 for tips on working
around a battery without getting hurt.

When you are ready to use the vehicle again,

refer to the engine starting procedure in the Index.

235

Downloaded from www.Manualslib.com manuals search engine

 Jump Starting Trying to start your vehicle by pushing or
pulling it will not work, and it could damage
If your vehicle’s batteries have run down, you may your vehicle.
want to use another vehicle and some jumper
1. Check the other vehicle. It must have a
cables to start your vehicle. Be sure to use
12-volt battery (or batteries) with a negative
the following steps to do it safely.
ground system.
Notice: If the other vehicle’s system is not
{CAUTION: a 12-volt system with a negative ground, both
vehicles can be damaged. Only use vehicles
Batteries can hurt you. They can be with 12-volt systems with negative grounds to
dangerous because: jump start your vehicle.
• They contain acid that can burn you. In diesel engine vehicles with two batteries,
• They contain gas that can explode or you may not be able to get enough power from
ignite. a single battery in another vehicle to start
• They contain enough electricity to your diesel engine, especially in cold weather.
burn you. Use the battery closest to the starter — this
will reduce electrical resistance.
If you do not follow these steps exactly,
some or all of these things can hurt you. 2. Get the vehicles close enough so the jumper
cables can reach, but be sure the vehicles are
not touching each other. If they are, it could
Notice: Ignoring these steps could result in cause a ground connection you do not want.
costly damage to your vehicle that would You would not be able to start your vehicle, and
not be covered by your warranty. the bad grounding could damage the electrical
systems.

236

Downloaded from www.Manualslib.com manuals search engine

 To avoid the possibility of the vehicles rolling,
set the parking brake firmly on both vehicles
involved in the jump start procedure. Put {CAUTION:
an automatic transmission in PARK (P) or a
manual transmission in NEUTRAL before Using a match near a battery can cause
setting the parking brake. battery gas to explode. People have been
hurt doing this, and some have been
Notice: If you leave your radio or other
accessories on during the jump starting blinded. Use a flashlight if you need
procedure, they could be damaged. The repairs more light.
would not be covered by your warranty. Always Be sure the batteries have enough water.
turn off your radio and other accessories when You do not need to add water to the
jump starting your vehicle. ACDelco® battery (or batteries) installed in
3. Turn off the ignition on both vehicles. Unplug your new vehicle. But if a battery has filler
unnecessary accessories plugged into the caps, be sure the right amount of fluid is
cigarette lighter or accessory power outlets. there. If it is low, add water to take care of
Turn off the radio and all lamps that are that first. If you do not, explosive gas could
not needed. This will avoid sparks and be present.
help save both batteries. And it could
save the radio! Battery fluid contains acid that can
4. Locate the batteries on each vehicle. Find the burn you. Do not get it on you. If you
positive (+) and negative (−) terminals on each accidentally get it in your eyes or on your
battery. skin, flush the place with water and get
You will not see the batteries of your vehicle medical help immediately.
under the hood. They are located in a frame
mounted battery box on the passenger’s side of
the vehicle.
237

Downloaded from www.Manualslib.com manuals search engine

 6. Connect the red
positive (+) cable
{CAUTION: to the positive (+)
terminal of the dead
Fans or other moving engine parts can battery. Use a
injure you badly. Keep your hands away remote positive (+)
from moving parts once the engine is terminal if the
running. vehicle has one.

5. Check that the jumper cables do not have

loose or missing insulation. If they do, you
could get a shock. The vehicles could
be damaged too.
7. Do not let the other end touch metal. Connect it
Before you connect the cables, here are some to the positive (+) terminal of the good battery.
basic things you should know. Positive (+) will Use a remote positive (+) terminal if the vehicle
go to positive (+) or to a remote positive (+) has one.
terminal if the vehicle has one. Negative (−) will
go to a heavy, unpainted metal engine part or
to a remote negative (−) terminal if the vehicle
has one.
Do not connect positive (+) to negative (−) or
you will get a short that would damage the
battery and maybe other parts too. And do
not connect the negative (−) cable to the
negative (−) terminal on the dead battery
because this can cause sparks.

238

Downloaded from www.Manualslib.com manuals search engine

 8. Now connect the black negative (−) cable to The electrical connection is just as good
the negative (−) terminal of the good battery. there, and the chance of sparks getting back
Use a remote negative (−) terminal if the to the battery is much less.
vehicle has one.
10. Now start the vehicle with the good batteries
Do not let the other end touch anything until the
and run the engine for a while. If your vehicle
next step. The other end of the negative (−) has the high idle option, use it.
cable does not go to the dead battery. It goes
to a heavy, unpainted metal engine part or to a 11. Try to start the vehicle that had the dead
remote negative (−) terminal on the vehicle with batteries. If it will not start after a few tries,
the dead battery. it probably needs service.
9. Connect the
other end of the
negative (−) cable
at least 18 inches
(45 cm) away from
the dead battery,
but not near engine
parts that move.

239

Downloaded from www.Manualslib.com manuals search engine

 Notice: If the jumper cables are connected or To disconnect the jumper cables from both
removed in the wrong order, electrical shorting vehicles, do the following:
may occur and damage the vehicle. The repairs 1. Disconnect the black negative (−) cable from
would not be covered by your warranty. Always the vehicle that had the dead batteries.
connect and remove the jumper cables in the
correct order, making sure that the cables do 2. Disconnect the black negative (−) cable from
not touch each other or other metal. the vehicle with the good batteries.
3. Disconnect the red positive (+) cable from the
vehicle with the good batteries.
4. Disconnect the red positive (+) cable from the
other vehicle.

Jumper Cable Removal

A. Heavy, Unpainted Metal Engine Part or
Remote Negative (−) Terminal
B. Good Battery or Remote Positive (+) and
Remote Negative (−) Terminals
C. Dead Battery or Remote Positive (+) Terminal
240

Downloaded from www.Manualslib.com manuals search engine

 Rear Axle How to Check Lubricant
When to Check and Change Lubricant
Refer to the Maintenance Schedule to determine
how often to check the lubricant and when to
change it. See Scheduled Maintenance on
page 295.
Notice: If you drive your vehicle through deep
water that is higher than the front or rear axle,
water may enter the axle housing and cause
the axle lubricant to break down. This could
damage the gears inside. Avoid driving your
vehicle through deep water.
You should avoid driving your vehicle through
HD2 Axle
deep puddles or standing water. If you must drive
through water that is higher than the front or To get an accurate reading, the vehicle should be
rear axle, see your dealer immediately afterward on a level surface.
to have the condition of the axle lubricant checked. If the level is below the bottom of the filler plug
hole, located on the rear axle, you’ll need to add
some lubricant. Add enough lubricant to raise
the level to the bottom of the filler plug hole.
What to Use
Refer to the Maintenance Schedule to determine
what kind of lubricant to use. See Part C:
Recommended Fluids and Lubricants on page 321.
241

Downloaded from www.Manualslib.com manuals search engine

 Rear Axle Shift Motor Cab Tilting
When to Check and Change Fluid
Before You Tilt the Cab
If you have an optional air-shift two-speed,
controlled traction, or locking differential type rear Most fluids and lubricants requiring regular
axle, a good time to check the fluid level in the checking can be accessed at the back of the
axle shift motor is when the rear axle lubricant is cab. If you need to gain access to components
checked. under the cab, follow this entire procedure
carefully.
How to Check Fluid • Find a level place to tilt the cab.
Remove the plug on the front plate of the axle • Secure all loose articles in the cab and close
shift motor, add enough fluid to raise the level to the cab door.
the bottom of the filler plug hole, then replace
the plug. • Check for adequate clearance in front and
above the cab.
What to Use To help prevent the vehicle from moving:
Refer to your Maintenance Schedule to determine 1. Apply the parking brake.
what kind of lubricant to use. See Part C:
Recommended Fluids and Lubricants on page 321. 2. Place the automatic transmission in PARK (P)
or shift the manual transmission to NEUTRAL.
3. Turn the engine off.
4. Block the front and rear wheels.

242

Downloaded from www.Manualslib.com manuals search engine

 Tilting the Cab
To tilt the cab, do the following:
1. Locate the lever pin at the rear of the cab,
on the passenger’s side.
2. Turn the lever pin
so that the tab is
aligned with the
slot. Remove the
lever pin.

3. Move the primary tilt lever all the way down.

4. Pull the secondary
latch lever to release
the hook from the
catch at the back of
the cab.

243

Downloaded from www.Manualslib.com manuals search engine

 6. Tilt the cab all the
way forward until the
cab support under
the cab locks fully.
A. Safety Lock Pin
B. Cab Support

7. Remove the safety

5. Using the handle located at the bottom of the lock pin from its
cab at the back, tilt the cab forward. retainer on the cab
support. Insert
the pin into the hole
in the cab support
by aligning the
tab with the slot.

244

Downloaded from www.Manualslib.com manuals search engine

 Lowering the Cab
{CAUTION: When the cab is ready to be lowered, follow the
instructions below carefully. Before lowering
A cab not properly locked in the tilted the cab, be sure all filler caps are on properly.
position could fall, causing serious injury. 1. Remove the safety
To ensure that the cab is securely locked lock pin from the cab
in position and will not move, the safety support by turning it
lock pin (A) must always be inserted into and pulling it out.
the cab support (B) when the cab is in the
tilted position.

{CAUTION:
Things that burn can get on hot engine
parts and start a fire. These include
liquids like fuel, oil, coolant, brake fluid,
windshield washer and other fluids, and
plastic or rubber. You or others could be
burned. Be careful not to drop or spill
things that will burn onto a hot engine.

245

Downloaded from www.Manualslib.com manuals search engine

 2. Squeeze the lever
on the cap support
to release the
detent.

3. Using the handle located at the bottom of the

cab toward the back, lower the cab until the
hook catches and the cab is held down.
4. Push the primary tilt lever upward fully to lock
the cab to the chassis.

246

Downloaded from www.Manualslib.com manuals search engine

 5. Reinstall the pin and Lifting the Front Panel
turn it to keep the
primary tilt lever To access the windshield washer fluid reservoir
from moving and the clutch fluid reservoir, the front panel must
downward. be lifted.
1. To lift the panel,
grasp the rear of
the release catch,
located at the bottom
of the instrument
panel, and pull it
toward you.

{CAUTION:
An unsecured cab could move suddenly
causing an accident or an injury. Be sure See Instrument Panel Overview on page 100
the tilt cab is properly secured to the for more information on location of the
chassis before moving the vehicle. release catch.

247

Downloaded from www.Manualslib.com manuals search engine

 2. Then go to the front Noise Control System
of the vehicle and
lift the panel at
the center. Use the Tampering with Noise Control
prop rod to hold System Prohibited
the panel open.
The following information relates to compliance
with federal noise emission standards for vehicles
with a Gross Vehicle Weight Rating (GVWR) of
more than 10,000 lbs (4 536 kg). The Maintenance
Schedule provides information on maintaining
the noise control system to minimize degradation
of the noise emission control system during
3. To close the front panel, remove the prop rod, the life of your vehicle. The noise control system
close the panel and push firmly on both sides warranty is given in your warranty booklet.
to ensure that the panel is fully closed. These standards apply only to vehicles sold in the
United States.

248

Downloaded from www.Manualslib.com manuals search engine

 Federal law prohibits the following acts or the Fan and Drive:
causing thereof: • Removal of fan clutch, if the vehicle has one,
1. The removal or rendering inoperative or rendering clutch inoperative.
by any person, other than for purposes of • Removal of the fan shroud, if the vehicle
maintenance, repair or replacement, of any has one.
device or element of design incorporated into
any new vehicle for the purpose of noise Air Intake:
control, prior to its sale or delivery to the • Removal of the air cleaner silencer.
ultimate purchaser or while it is in use; or
• Modification of the air cleaner.
2. The use of the vehicle after such device or
element of design has been removed or Exhaust:
rendered inoperative by any person. • Removal of the muffler or resonator.
Among those acts presumed to constitute • Removal of the exhaust pipes and exhaust
tampering are the acts listed below. pipe clamps.
Insulation: • Removal of the DOC converter, the Diesel
• Removal of the noise shields or any Particulate Filter, or the diesel exhaust gas
underhood insulation. cooler device.
Engine:
• Removal or rendering engine speed governor,
if the vehicle has one, inoperative so as to
allow engine speed to exceed manufacturer
specifications.

249

Downloaded from www.Manualslib.com manuals search engine

 Bulb Replacement Here’s how to remove the wiper blade:

It is recommended that all bulbs be replaced by

your dealer.

Windshield Wiper Blade

Replacement
Windshield wiper blades should be inspected at
least twice a year for wear or cracking. See “Wiper
Blade Check” under At Least Twice a Year on
page 316 for more information.
Replacement blades come in different types and
are removed in different ways.
1. Pull the windshield wiper arm away from the
windshield.

250

Downloaded from www.Manualslib.com manuals search engine

 Other Service Items
Fuel Filter
Your fuel filter is located in the engine
compartment on the driver’s side of the vehicle,
or along the driver’s side frame rail. See Fuel Filter
Replacement earlier in this section for further
information.
Also see Scheduled Maintenance on page 295 for
recommended service intervals.

2. Push the release lever and slide the wiper

assembly toward the driver’s side of the
vehicle.
3. Install a new blade by reversing
Steps 1 and 2.

251

Downloaded from www.Manualslib.com manuals search engine

 Primary Fuel Filter and Water Secondary Fuel Filter and Heater
Separator Your vehicle may have this fuel filter and fuel
heater. It is mounted on the left side of the engine.
Your vehicle may have
this spin-on filter. It is
located on the driver’s
side frame rail.

It has a clear plastic drain bowl at the bottom.

Check the drain bowl occasionally for any water It has a metal drain bowl at the bottom.
or particles. Occasionally, check the bowl for any water or
To drain the water or to replace the element, particles. To check or drain the bowl, shut off the
follow the water draining and element replacement engine.
procedure under Water in Fuel on page 198.

252

Downloaded from www.Manualslib.com manuals search engine

 Front Wheel Bearings with If your vehicle
has oil-filled hubs,
Oil-Filled Hubs occasionally check to
Notice: If you drive your vehicle through deep see if they have enough
water that is higher than the front or rear oil. You can tell if there
axle, water may enter the axle housing and is oil there by using the
cause the axle lubricant to break down. circular gage on the
This could damage the gears inside. Avoid sight glass.
driving your vehicle through deep water.
You should avoid driving your vehicle through
deep puddles or standing water. If you must drive
through water that is higher than the front or
rear axle, see your dealer immediately afterward If there isn’t, clean the rubber fill plug in the center
to have the condition of the axle lubricant checked. of the glass, and then remove it. Be careful not
to allow any dirt or water to get into the oil.
Add enough of the recommended oil to bring it up
to the level mark that you’ll see on the glass.
Refer to your Maintenance Schedule for the proper
oil to use.
When you fill the hub, check the glass again after
driving a short distance. It takes a while for the
oil to flow through the system, and you may
find that you have to add a little more to fill it to
the proper level. Be sure not to overfill the hub.

253

Downloaded from www.Manualslib.com manuals search engine

 Tires
CAUTION: (Continued)
Your new vehicle comes with high-quality tires
made by a leading tire manufacturer. If you ever • Underinflated tires pose the same
have questions about your tire warranty and where danger as overloaded tires. The
to obtain service, see your vehicle Warranty resulting accident could cause serious
booklet for details. injury. Check all tires frequently to
maintain the recommended pressure.
Tire pressure should be checked when
{CAUTION: your vehicle’s tires are cold. See
Inflation - Tire Pressure on page 255.
Poorly maintained and improperly used • Overinflated tires are more likely
tires are dangerous. to be cut, punctured, or broken
• Overloading your vehicle’s tires can by a sudden impact — such as
cause overheating as a result of too when you hit a pothole. Keep tires
much friction. You could have an at the recommended pressure.
air-out and a serious accident. See • Worn, old tires can cause accidents.
Loading Your Vehicle on page 180. If the tire’s tread is badly worn, or
if your vehicle’s tires have been
CAUTION: (Continued) damaged, replace them.

254

Downloaded from www.Manualslib.com manuals search engine

 Inflation - Tire Pressure When to Check
Tires need the correct amount of air pressure Check your tires once a month or more.
to operate effectively. The Certification or Tire Also, check the tire pressure of the spare tire if
Information label shows the correct inflation your vehicle has one.
pressures for your tires when they are cold. Cold
means your vehicle has been sitting for at least How to Check
three hours or driven no more than 1 mile (1.6 km). Use a good quality pocket-type gage to check tire
Notice: Do not let anyone tell you that pressure. You cannot tell if your vehicle’s tires are
under-inflation or over-inflation is all right. properly inflated simply by looking at them. Radial
It is not. If your tires do not have enough air tires may look properly inflated even when they are
(under-inflation), you can get the following: underinflated. Check the tire’s inflation pressure
• Too much flexing when the tires are cold. Cold means your vehicle
has been sitting for at least three hours or driven
• Too much heat no more than 1 mile (1.6 km).
• Tire overloading
Remove the valve cap from the tire valve stem.
• Premature or irregular wear Press the tire gage firmly onto the valve to
• Poor handling get a pressure measurement. If the cold tire
• Reduced fuel economy inflation pressure matches the recommended
pressure on the Certification or Tire Information
If your tires have too much air (over-inflation), label, no further adjustment is necessary.
you can get the following: If the inflation pressure is low, add air until you
• Unusual wear reach the recommended amount. If you overfill
• Poor handling the tire, release air by pushing on the metal
• Rough ride stem in the center of the tire valve. Re-check
the tire pressure with the tire gage.
• Needless damage from road hazards
255

Downloaded from www.Manualslib.com manuals search engine

 Be sure to put the valve caps back on the valve See Tightening the Wheel Nuts on page 259 for
stems. They help prevent leaks by keeping out dirt wheel nut tightening information and proper torque
and moisture. values.

Wheel Loading
{CAUTION:
Wheels are stamped with a maximum load and
cold inflation rating. Be sure you do not exceed If you operate your vehicle with a tire
these limits.
that is badly underinflated, the tire can
overheat. An overheated tire can lose air
Dual Tire Operation suddenly or catch fire. You or others
When the vehicle is new, check the wheel nut could be injured. Be sure all tires
tightness on all wheels with a torque wrench after (including the spare, if any) are
your first 100 miles (160 km) and then 1,000 miles properly inflated.
(1 600 km) after that. Whenever a wheel, wheel bolt
or wheel nut is removed or serviced, repeat the
100 miles (160 km), and then 1,000 mile (1 600 km) See Tires on page 254 and Inflation - Tire
wheel nut tightness check. Pressure on page 255 for more information on
proper tire inflation.

256

Downloaded from www.Manualslib.com manuals search engine

 When It Is Time for New Tires
Replace your tires when the tread depth is down {CAUTION:
to 1/8 of an inch (3.2 mm) for the front tires,
or 1/16 of an inch (1.6 mm) for a rear tire. Mixing tires could cause you to lose
Also, you need a new tire if: control while driving. If you mix tires of
• You can see cord or fabric showing through different sizes, brands, or types (radial
the tire’s rubber. and bias-belted tires) the vehicle may
• The tread or sidewall is cracked, cut, or not handle properly, and you could have
snagged deep enough to show cord or fabric. a crash. Using tires of different sizes,
brands, or types may also cause damage
• The tire has a bump, bulge, or split.
to your vehicle. Be sure to use the correct
• The tire has a puncture, cut, or other damage size, brand, and type of tires on your
that cannot be repaired well because of the vehicle’s wheels.
size or location of the damage.

When you replace tires, make sure they are

the same size, load range, speed rating, and
construction type (bias, bias-belted or radial) as
your original tires.

257

Downloaded from www.Manualslib.com manuals search engine

 Different Size Tires and Wheels
If wheels or tires are added that are a different {CAUTION:
size than the original equipment wheels and tires,
this could affect the way your vehicle performs, If you add different sized wheels, your
including its braking, ride and handling vehicle may not provide an acceptable
characteristics, stability, and resistance to rollover. level of performance and safety if tires
Additionally, if your vehicle has electronic systems not recommended for those wheels are
such as, anti-lock brakes, traction control, and selected. You may increase the chance
electronic stability control, the performance of
that you will crash and suffer serious
these systems can be affected.
injury. Only use the specific wheel and
tire systems developed for your vehicle,
and have them properly installed.

See Accessories and Modifications on page 191

for additional information.

258

Downloaded from www.Manualslib.com manuals search engine

 Wheel Alignment and Tire Balance Tightening the Wheel Nuts
The wheels on your vehicle were aligned at
the factory to give you the longest tire life and
best overall performance. {CAUTION:
Proper front wheel alignment must be maintained
Wheel nuts that are not tight can work
in order to ensure efficient steering, good
directional stability, and prevent abnormal tire loose. If all the nuts on a wheel come off,
wear. If you notice unusual tire wear or your the wheel can come off the vehicle,
vehicle is pulling one way or the other, the causing a crash. All wheel nuts must be
alignment may need to be reset. If you notice properly tightened. Follow the rules in this
your vehicle vibrating when driving on a smooth section to be sure they are.
road, your wheels may need to be balanced.
This section lets you know how often to check the
tightness of the wheel nuts on your vehicle and
how tight they must be.

259

Downloaded from www.Manualslib.com manuals search engine

 First, use these pictures to decide what kind of Hub-Piloted Wheels, 8-Hole or 10-Hole
wheels you have.
The studs and nuts used with these wheels have
right-hand threads.
1. With intermittent pilot pads, position a
pad at 12 o’clock to center the wheel
and reduce run-out.
2. Put the tire and rim assembly on the axle hub.
Install the outer rear tire and rim assembly so
that its valve stem is exactly opposite the
valve stem on the inner tire and rim assembly.
3. Put on the wheel nuts.
Hub-Piloted Type, Hub-Piloted Type,
8-Hole 10-Hole 4. Finger-tighten the nuts.
5. Oil the surfaces (B)
Then, refer to the following steps for the wheels between the nuts (C)
you have. and washers (A).
Do not oil the studs
or the threads of
the nut.

260

Downloaded from www.Manualslib.com manuals search engine

 6. Tighten the nuts to 400 lb ft (542 Y) if an
8-hole stud or 480 lb ft (650 Y) if a 10-hole
stud, using the following diagrams.

10-Hole (Front) 10-Hole (Rear)

{CAUTION:
8-Hole
Never use oil or grease on studs or the
threads of the wheel nuts. If you do, the
wheel nuts might come loose and the
wheel could fall off, causing a crash.

261

Downloaded from www.Manualslib.com manuals search engine

 {CAUTION: {CAUTION:
If wheel studs are damaged, they can Rust or dirt on a wheel, or on the parts to
break. If all the studs on a wheel broke, which it is fastened, can make wheel nuts
the wheel could come off and cause a become loose after a time. The wheel
crash. If any stud is damaged because could come off and cause a crash. When
of a loose-running wheel, it could be that you change a wheel, remove any rust or
all of the studs are damaged. To be sure, dirt from places where the wheel attaches
replace all studs on the wheel. If the stud to the vehicle. In an emergency, you can
holes in a wheel have become larger, use a cloth or a paper towel to do this;
the wheel could collapse in operation. but be sure to use a scraper or wire brush
Replace any wheel if its stud holes have later, if you need to, to get all the rust or
become larger or distorted in any way. dirt off.
Inspect hubs and hub-piloted wheels
for damage. Because of loose running
wheels, piloting pad damage may occur How Often to Check
and require replacement of the entire hub, Wheel tightness is so important you should have a
for proper centering of the wheels. When technician check nut tightness on all wheels with a
replacing studs, hubs, wheel nuts or torque wrench after your first 100 miles (160 km),
wheels, be sure to use GM original and then 1,000 miles (1 600 km) after that. Be sure
equipment parts. to repeat this service whenever you have a tire
removed or serviced. See Scheduled Maintenance
on page 295 for further information.

262

Downloaded from www.Manualslib.com manuals search engine

 Wheel Replacement
Replace any wheel that is bent, cracked, or badly {CAUTION:
rusted or corroded. If wheel nuts keep coming
loose, replace the wheel, wheel bolts, and wheel Using the wrong replacement wheels,
nuts. If the wheel leaks air, replace it. wheel bolts, or wheel nuts on your vehicle
Your dealer will know the kind of wheel you need. can be dangerous. It could affect the
braking and handling of your vehicle,
Each new wheel should have the same
load-carrying capacity, diameter, width, offset make your tires lose air and make you
and be mounted the same way as the one lose control. You could have a collision
it replaces. in which you or others could be injured.
Always use the correct wheel, wheel bolts,
and wheel nuts for replacement.

If you need to replace any of your wheels, wheel

bolts or wheel nuts, replace them only with
new original equipment parts. This way, you will
be sure to have the right wheel, wheel bolts
and wheel nuts for your vehicle.

263

Downloaded from www.Manualslib.com manuals search engine

 CAUTION: (Continued)
{CAUTION:
dealer to get a new wheel, wheel bolts or
A leaking wheel could fail without warning. wheel nuts, be sure you get the correct
A wheel designed for tubeless tires could ones. Each new wheel should match the
be leaking because it is damaged. Do not original wheel in load-carrying capacity,
use an inner tube or some other thing to try inflation pressure capacity, diameter,
to stop the leaking. Get a new wheel of the width, offset and mounting configuration.
proper type.

Using wheels and tires with higher load-carrying

limits than the original wheels and tires does
{CAUTION: not change the Gross Axle Weight Rating (GAWR)
or the Gross Vehicle Weight Rating (GVWR) of
your vehicle. See Loading Your Vehicle on
Without the correct wheel, wheel bolts or page 180 for more information.
wheel nuts, you may not be able to stop
properly, and you could have other Notice: The wrong wheel can cause trouble in
problems like a tire air-out. You could bearing life, brake cooling, speedometer/
have a collision. If you do not go to your odometer calibration, headlamp aim, bumper
height, vehicle ground clearance, stopping
CAUTION: (Continued) distance and tire clearance to the body and
chassis. You could also have other problems
like a tire air-out.

264

Downloaded from www.Manualslib.com manuals search engine

 Used Replacement Wheels If a Tire Goes Flat
It is unusual for a tire to blowout while you are
{CAUTION: driving, especially if you maintain your tires
properly. If air goes out of a tire, it is much more
likely to leak out slowly. But if you should ever
Putting a used wheel on your vehicle is have a blowout, here are a few tips about what
dangerous. You cannot know how it has to expect and what to do:
been used or how far it has been driven.
If a front tire fails, the flat tire will create a drag
It could fail suddenly and cause a crash. that pulls the vehicle toward that side. Take
If you have to replace a wheel, use a new your foot off the accelerator pedal and grip the
original equipment wheel. steering wheel firmly. Steer to maintain lane
position, and then gently brake to a stop well
out of the traffic lane.
A rear blowout, particularly on a curve, acts much
like a skid and may require the same correction
you would use in a skid. In any rear blowout,
remove your foot from the accelerator pedal.
Get the vehicle under control by steering the
way you want the vehicle to go. It may be very
bumpy and noisy, but you can still steer. Gently
brake to a stop –– well off the road if possible.

265

Downloaded from www.Manualslib.com manuals search engine

 If a tire goes flat, avoid further tire and wheel a flat tire safely. For example, you would need a
damage by driving slowly to a level place and turn truck jack that can lift several thousand pounds
on your hazard warning flashers. See Hazard and a torque wrench that can generate several
Warning Flashers on page 102. hundred foot-pounds (Y) of twisting force.

{CAUTION: {CAUTION:
Your vehicle, when new, did not include If you try to put air back into a tire that
tire changing equipment or a place to has run flat, even a tire that was extremely
store a tire in the vehicle. Special tools low on air, the tire can have a sudden
and procedures are required if a tire air-out. This could cause you to lose
needs to be serviced. If these tools and control of the vehicle and have a serious
procedures are not used, you or others crash. Do not refill a flat or very low tire
could be injured or killed while trying to with air without first having the tire taken
change or service a truck tire. off the wheel and checked for damage.

Your truck, when new, did not include tire changing So if you are stopped somewhere by a flat or
equipment or a place to store a tire in the damaged tire or wheel, you should get expert help.
vehicle. Few drivers of these vehicles have the See Roadside Assistance Program on page 332.
necessary equipment aboard to be able to change

266

Downloaded from www.Manualslib.com manuals search engine

 Appearance Care using cleaners on surfaces for which they were not
intended. Use glass cleaner only on glass. Remove
any accidental over-spray from other surfaces
Cleaning the Inside of Your Vehicle immediately. To prevent over-spray, apply cleaner
directly to the cleaning cloth.
Your vehicle’s interior will continue to look its best
if it is cleaned often. Although not always visible, Notice: If you use abrasive cleaners when
dust and dirt can accumulate on your upholstery. cleaning glass surfaces on your vehicle,
Dirt can damage carpet, fabric, leather, and plastic you could scratch the glass. When cleaning
surfaces. Regular vacuuming is recommended the glass on your vehicle, use only a soft
to remove particles from your upholstery. It is cloth and glass cleaner.
important to keep your upholstery from becoming Many cleaners contain solvents that may become
and remaining heavily soiled. Soils should be concentrated in your vehicle’s breathing space.
removed as quickly as possible. Your vehicle’s Before using cleaners, read and adhere to all safety
interior may experience extremes of heat that
instructions on the label. While cleaning your
could cause stains to set rapidly.
vehicle’s interior, maintain adequate ventilation
Lighter colored interiors may require more by opening your vehicle’s doors and windows.
frequent cleaning. Use care because newspapers
Dust may be removed from small buttons and
and garments that transfer color to your home knobs using a small brush with soft bristles.
furnishings may also transfer color to your
vehicle’s interior. Your GM dealer has a product for cleaning your
vehicle’s glass. Should it become necessary,
When cleaning your vehicle’s interior, only use
you can also obtain a product from your GM dealer
cleaners specifically designed for the surfaces to remove odors from your vehicle’s upholstery.
being cleaned. Permanent damage may result from

267

Downloaded from www.Manualslib.com manuals search engine

 Do not clean your vehicle using the following Fabric/Carpet
cleaners or techniques:
• Never use a knife or any other sharp object to Use a vacuum cleaner with a soft brush
attachment frequently to remove dust and loose
remove a soil from any interior surface.
dirt. A canister vacuum with a beater bar in
• Never use a stiff brush. It can cause damage the nozzle may only be used on floor carpet and
to your vehicle’s interior surfaces. carpeted floor mats. For soils, always try to remove
• Never apply heavy pressure or rub them first with plain water or club soda. Before
aggressively with a cleaning cloth. Use of cleaning, gently remove as much of the soil
heavy pressure can damage your interior as possible using one of the following techniques:
and does not improve the effectiveness of • For liquids: gently blot the remaining soil
soil removal. with a paper towel. Allow the soil to absorb
• Use only mild, neutral-pH soaps. Avoid into the paper towel until no more can
laundry detergents or dishwashing soaps with be removed.
degreasers. Using too much soap will leave a • For solid dry soils: remove as much as
residue that leaves streaks and attracts dirt. possible and then vacuum.
For liquid cleaners, about 20 drops per gallon
To clean, use the following instructions:
(3.78 L) of water is a good guide.
• Do not heavily saturate your upholstery while 1. Saturate a lint-free, clean white cloth with
cleaning. water or club soda.
• Damage to your vehicle’s interior may result 2. Wring the cloth to remove excess moisture.
from the use of many organic solvents such as 3. Start on the outside edge of the soil and gently
naptha, alcohol, etc. rub toward the center. Continue cleaning,
using a clean area of the cloth each time it
becomes soiled.

268

Downloaded from www.Manualslib.com manuals search engine

 4. Continue to gently rub the soiled area until the Instrument Panel, Vinyl, and Other
cleaning cloth remains clean.
Plastic Surfaces
5. If the soil is not completely removed, use a
mild soap solution and repeat the cleaning A soft cloth dampened with water may be used
process that was used with plain water. to remove dust. If a more thorough cleaning is
necessary, a clean soft cloth dampened with a mild
If any of the soil remains, a commercial fabric
soap solution can be used to gently remove dust
cleaner or spot lifter may be necessary. When a
and dirt. Never use spot lifters or removers on
commercial upholstery cleaner or spot lifter is to
plastic surfaces. Many commercial cleaners and
be used, test a small hidden area for colorfastness
coatings that are sold to preserve and protect soft
first. If the locally cleaned area gives any
plastic surfaces may permanently change the
impression that a ring formation may result,
appearance and feel of your interior and are not
clean the entire surface.
recommended. Do not use silicone or wax-based
After the cleaning process has been completed, a products, or those containing organic solvents to
paper towel can be used to blot excess moisture clean your vehicle’s interior because they can
from the fabric or carpet. alter the appearance by increasing the gloss in
a non-uniform manner.
Some commercial products may increase gloss
on your instrument panel. The increase in
gloss may cause annoying reflections in the
windshield and even make it difficult to see
through the windshield under certain conditions.

269

Downloaded from www.Manualslib.com manuals search engine

 Care of Safety Belts Washing Your Vehicle
Keep belts clean and dry. The paint finish on the vehicle provides beauty,
depth of color, gloss retention, and durability.
The best way to preserve the vehicle’s finish is to
{CAUTION: keep it clean by washing it often with lukewarm
or cold water.
Do not bleach or dye safety belts. If you
Do not wash the vehicle in the direct rays of the
do, it may severely weaken them. In a sun. Use a car washing soap. Do not use strong
crash, they might not be able to provide soaps or chemical detergents. Be sure to rinse the
adequate protection. Clean safety belts vehicle well, removing all soap residue completely.
only with mild soap and lukewarm water. Approved cleaning products can be obtained from
your dealer. See Vehicle Care/Appearance
Materials on page 274. Do not use cleaning agents
Weatherstrips that are petroleum based, or that contain acid or
abrasives. All cleaning agents should be flushed
Silicone grease on weatherstrips will make them promptly and not allowed to dry on the surface, or
last longer, seal better, and not stick or squeak. they could stain. Dry the finish with a soft, clean
Apply silicone grease with a clean cloth. During chamois or an all-cotton towel to avoid surface
very cold, damp weather frequent application may scratches and water spotting.
be required. See Part C: Recommended Fluids High pressure car washes may cause water to
and Lubricants on page 321. enter the vehicle.

270

Downloaded from www.Manualslib.com manuals search engine

 Cleaning Exterior Lamps/Lenses chimneys, etc., can damage the vehicle’s finish if
they remain on painted surfaces. Wash the vehicle
Use only lukewarm or cold water, a soft cloth and as soon as possible. If necessary, use non-abrasive
a car washing soap to clean exterior lamps cleaners that are marked safe for painted surfaces
and lenses. Follow instructions under Washing to remove foreign matter.
Your Vehicle on page 270.
Exterior painted surfaces are subject to aging,
weather and chemical fallout that can take their
Finish Care toll over a period of years. The paint finish can be
Occasional waxing or mild polishing of the vehicle kept looking new by keeping the vehicle garaged
by hand may be necessary to remove residue or covered whenever possible.
from the paint finish. You can get GM-approved Protecting Exterior Bright Metal Parts
cleaning products from your dealer. See
Vehicle Care/Appearance Materials on page 274. Bright metal parts should be cleaned regularly
to keep their luster. Washing with water is all that
Notice: Machine compounding or aggressive is usually needed. However, chrome polish on
polishing on a basecoat/clearcoat paint finish chrome or stainless steel trim can be used
may damage it. Use only non-abrasive waxes if necessary.
and polishes that are made for a basecoat/
Use special care with aluminum trim. To avoid
clearcoat paint finish on your vehicle.
damaging protective trim, never use auto or
Foreign materials such as calcium chloride and chrome polish, steam or caustic soap to clean
other salts, ice melting agents, road oil and tar, aluminum. A coating of wax, rubbed to high polish,
tree sap, bird droppings, chemicals from industrial is recommended for all bright metal parts.

271

Downloaded from www.Manualslib.com manuals search engine

 Windshield and Wiper Blades Aluminum Wheels
Clean the outside of the windshield with glass The vehicle may have aluminum wheels.
cleaner. Notice: If you use strong soaps, chemicals,
Clean the rubber blades using a lint free cloth or abrasive polishes, cleaners, brushes, or
paper towel soaked with windshield washer fluid or cleaners that contain acid on aluminum or
a mild detergent. Wash the windshield thoroughly chrome-plated wheels, you could damage the
when cleaning the blades. Bugs, road grime, surface of the wheel(s). The repairs would not
sap, and a buildup of vehicle wash/wax treatments be covered by your warranty. Use only
may cause wiper streaking. Replace the wiper GM-approved cleaners on aluminum or
blades if they are worn or damaged. chrome-plated wheels.
Wipers can be damaged by: Keep the wheels clean using a soft clean cloth
with mild soap and water. Rinse with clean water.
• Extreme dusty conditions After rinsing thoroughly, dry with a soft clean
• Sand and salt towel. A wax may then be applied.
• Heat and sun Notice: Using chrome polish on aluminum
• Snow and ice, without proper removal wheels could damage the wheels. The repairs
would not be covered by your warranty.
Use chrome polish on chrome wheels only.
The surface of these wheels is similar to the
painted surface of the vehicle. Do not use strong
soaps, chemicals, abrasive polishes, abrasive
cleaners, cleaners with acid, or abrasive cleaning
brushes on them because the surface could
be damaged. Do not use chrome polish on
aluminum wheels.

272

Downloaded from www.Manualslib.com manuals search engine

 Tires Finish Damage
To clean the tires, use a stiff brush with tire Any stone chips, fractures or deep scratches in
cleaner. the finish should be repaired right away. Bare
metal will corrode quickly and may develop into
Notice: Using petroleum-based tire dressing major repair expense.
products on your vehicle may damage the
paint finish and/or tires. When applying a Minor chips and scratches can be repaired with
tire dressing, always wipe off any overspray touch-up materials available from your dealer.
from all painted surfaces on your vehicle. Larger areas of finish damage can be corrected
in your dealer’s body and paint shop.
Sheet Metal Damage
Underbody Maintenance
If the vehicle is damaged and requires sheet
metal repair or replacement, make sure the body Chemicals used for ice and snow removal and dust
repair shop applies anti-corrosion material to control can collect on the underbody. If these are
parts repaired or replaced to restore corrosion not removed, corrosion and rust can develop on the
protection. underbody parts such as fuel lines, frame, floor pan,
and exhaust system even though they have
Original manufacturer replacement parts will corrosion protection.
provide the corrosion protection while maintaining
the warranty. At least every spring, flush these materials from the
underbody with plain water. Clean any areas where
mud and debris can collect. Dirt packed in close
areas of the frame should be loosened before being
flushed. Your dealer or an underbody car washing
system can do this for you.

273

Downloaded from www.Manualslib.com manuals search engine

 Chemical Paint Spotting Vehicle Care/Appearance Materials
Some weather and atmospheric conditions can
create a chemical fallout. Airborne pollutants can Description Usage
fall upon and attack painted surfaces on the Polishing Cloth Interior and exterior
vehicle. This damage can take two forms: blotchy, Wax- Treated polishing cloth.
ring-shaped discolorations, and small, irregular Tar and Road Oil Removes tar, road oil and
dark spots etched into the paint surface. Remover asphalt.
Although no defect in the paint job causes this, we Chrome Cleaner and Use on chrome or
will repair, at no charge to the owner, the surfaces Polish stainless steel.
of new vehicles damaged by this fallout condition
White Sidewall Tire Removes soil and black
within 12 months or 12,000 miles (20 000 km) of Cleaner marks from whitewalls.
purchase, whichever occurs first.
Vinyl Cleaner Cleans vinyl.
Removes dirt, grime,
Glass Cleaner smoke and fingerprints.
Removes dirt and grime
Chrome and Wire Wheel from chrome wheels and
Cleaner wire wheel covers.

274

Downloaded from www.Manualslib.com manuals search engine

 Description Usage Vehicle Identification
Removes dust,
Finish Enhancer fingerprints, and surface
contaminants. Spray on
Vehicle Identification Number (VIN)
wipe off.
Removes swirl marks, fine
Swirl Remover Polish scratches and other light
surface contamination.

Cleaner Wax Removes light scratches

and protects finish.
Cleans, shines and
Foaming Tire Shine protects in one easy step,
Low Gloss This is the legal identifier for your vehicle. It
no wiping necessary. appears on a plate in the front corner of the
Medium foaming instrument panel, on the driver side. You can see
shampoo. Cleans it if you look through the windshield from outside
Wash Wax Concentrate and lightly waxes. your vehicle. The VIN also appears on the
Biodegradable and
phosphate free. Certification/Tire label and the certificates of
title and registration.
Quickly and easily
Spot Lifter
removes spots and stains Engine Identification
from carpets, vinyl and
cloth upholstery. The eighth character in the VIN is the engine
code. This code helps you identify your vehicle’s
Odorless spray odor engine, specifications, and replacement parts.
Odor Eliminator eliminator used on fabrics,
vinyl, leather and carpet.

275

Downloaded from www.Manualslib.com manuals search engine

 Electrical System Windshield Wiper Fuses
The windshield wiper motor is protected by a
Add-On Electrical Equipment circuit breaker inside the motor and a circuit
breaker or fuse in the fuse block. If the motor
Notice: Do not add anything electrical to your overheats, the wipers will stop until the motor
vehicle unless you check with your dealer cools. If the overload is caused by an electrical
first. Some electrical equipment can damage problem, be sure to get it fixed.
your vehicle and the damage would not
be covered by your warranty. Some add-on
electrical equipment can keep other
Fusible Links
components from working as they should. A fusible link is a short piece of wire that is
covered by an insulated cover. It is several gage
Headlamp Wiring sizes smaller than the circuit it protects. It will
melt in an overload situation, opening the circuit.
The headlamp wiring is protected by a circuit
breaker in the light switch. An electrical overload Your starter and other circuits have these
will cause the lights to go on and off, or in fusible links. The size is printed on the insulation.
some cases to remain off. If this happens, have If the insulation is burned beyond recognition,
your headlamp wiring checked right away. consult your GM dealer for the proper size.
Replace a fusible link with one of the same size
and insulation type. Fusible link insulation is
a special purpose high-temperature material.

276

Downloaded from www.Manualslib.com manuals search engine

 Power Windows and Other Power Instrument Panel Fuse Block
Options
Circuit breakers in the fuse panel protect the
power windows and other power accessories.
When the current load is too heavy, the circuit
breaker opens. This protects the circuit until
the current load returns to normal or the
problem is fixed.

Fuses and Circuit Breakers

The wiring circuits in your vehicle are protected
from short circuits by a combination of fuses,
circuit breakers, maxi-fuses and fusible links.
This greatly reduces the chance of a fire caused
by an electrical problem. There may be a fuse The instrument panel fuse block is located on the
taped to the wiring harness near the hydraulic top of the instrument panel on the passenger’s
brake booster. side of the vehicle.
Before changing a fuse, turn the ignition off and To access the fuse block, remove the cover by
set the parking brake. lifting up on the front and turning it backward.
To reinstall the cover, put the tabs at the rear
of the cover into the slots on the instrument panel
and lower the cover down to snap into place.

277

Downloaded from www.Manualslib.com manuals search engine

 If you ever have a problem on the road and don’t
have a spare fuse, you can borrow one of the
correct value. Just pick some feature of your vehicle
that you can get along without, like the radio or
cigarette lighter, and use its fuse if it is the value
you need. Remember to replace the fuse as soon
as you can.
These fuses are non-cycling; do not replace them
with cycling fuses. Also, do not use fuses of a
higher amperage than those listed on the circuit
breaker block.

278

Downloaded from www.Manualslib.com manuals search engine

 Fuses Usage Fuses Usage
1 Ignition Switch 4 Transmission Control Module,
Ignition, Chime
2 Cigarette Lighter
5 Assembly Line Data Link Connector
3 Engine Control Module, Ignition 1

279

Downloaded from www.Manualslib.com manuals search engine

 Fuses Usage Fuses Usage
Warning Lamp, Ignition Relay, 16 Headlamp
6 Blower Motor, Motor Relay,
Auxiliary Relay, Power Window 17 Heated Fuel
Relay, Interior Relay
18 Meter Transmission Control Module
Room Lamp, Horn, Electric Parking
7 Brake, Radio Back Up, Rear Body Identification Lamp, Marker Lamp,
Dome Lamp 19 Tail Lamp, Lighted Mirror,
Illumination Lamp
8 Power Window
20 Cool Condenser Fan Motor, Cooler
Exhaust Brake Back Up, Air Compressor
Suspension Dump, Differential Lock,
9 Air Dryer, Moisture Ejection Heater, 21 Wiper Motor, Washer Motor
Electric Air Compressor, Power Heated Mirror, Two-Speed Axle
Take Off 22
Relay
10 Ignition Power 23 Empty
11 Left Trailer Turn Lamp 24 Fan Motor, Air Conditioner Relay
12 Auxiliary (Ignition ON) Right Trailer Turn Lamp,
25
13 Auxiliary (Battery Direct) Flasher Unit

14 Driver’s Side Headlamp 26 Power Post (Consent)

15 Passenger’s Side Headlamp

280

Downloaded from www.Manualslib.com manuals search engine

 Maxi-Fuse Block Fuses Usage
When a fuse goes out, first check the instrument ST/TURN/HAZ Stoplamp, Turn Signals/Hazard
panel fuse block. If there are no fuses out, the Warning Flashers
problem could be in the maxi-fuse block. IGN SW 3 Air Conditioner, Axle, Chassis
The maxi-fuse block outside of the cab on INT/EXT Parking Lamps, Dome Lamp,
the driver’s side of the vehicle. To access the LIGHTS Instrument Panel Lights
maxi-fuse block, remove the four screws from
Headlamps, Daytime
the front of the box and remove the cover. HEAD LAMP Running Lamps
Power is fed through these fuses to devices such AUX WRG Auxiliary Wiring, Parking Brake
as the headlamp switch, ignition switch feed
circuits and the auxiliary brake pump (hydraulic Ignition Switch, Washer/Wiper,
IGN SW 1
brake vehicles). Crank, Radio

Do not use maxi-fuses of higher amperage than HYD PUMP Hydraulic Brake, Brake Pump Motor
those indicated on the maxi-fuse block. ABS Anti-lock Brake System Module
ELECT TRANS Ignition Relay
PARK BRAKE Parking Brake Motor
BLOWER Blower, Horn, Cigarette Lighter,
HORN Auxiliary Outlets
Trailer Anti-lock Brake System,
TRAILER ABS
Trailer Stoplamps
PWR WDO/
LOCKS Power Window, Power Door Locks

281

Downloaded from www.Manualslib.com manuals search engine

 Relay Center

Relay Block A

Relay Block A Usage

1 Power Window (If Equipped)
2 Power Main (ECU)
3 High Beam
There are four relay blocks in your vehicle:
A. Relay Block A C. Relay Block C 4 Lighting
B. Relay Block B D. Relay Block D 5 Lighting (Low, High)
(Not Shown) 6 Trailer Turn Signal (Left Headlamp)
7 Taillamp
8 Marker Lamp (Tractor Only)
9 Trailer Turn Signal (Right Headlamp)

282

Downloaded from www.Manualslib.com manuals search engine

 Relay Block B Usage

1 Air Conditioning Condenser

(If Equipped)

2 Air Conditioning Compressor

(If Equipped)
3 Heater Fan
4 Ignition (Accessory)
5 Ignition (1)
6 Ignition (2)
Relay Block B 7 Auxiliary
8 Horn
9 Ignition (3)
10 Dome Lamp (If Equipped)
11 Exhaust Brake (If Equipped)
Power Take-Off Control
12 (If Equipped)

283

Downloaded from www.Manualslib.com manuals search engine

 Relay Block D

Relay Block C
Relay Block D Usage
Relay Block C Usage 1 Neutral (Medium Duty Transmission)
1 Parking Brake Back-up Lamp (Reverse)
2 (Medium Duty Transmission)
2 Daytime Running Lamps (DRL) On
(Engine Run)

3 Daytime Running Lamps (DRL) Off

(Parking)
Parking Lamps/Daytime Running
4 Lamps (DRL)
5 Fuel Filter (Heated Fuel)
6 Stop Lamp

284

Downloaded from www.Manualslib.com manuals search engine

 Capacities and Specifications
The following approximate capacities are given in English and metric conversions. See Part C:
Recommended Fluids and Lubricants on page 321 for more information.
Capacities and Specifications
Capacities
Application
English Metric
For the air conditioning system refrigerant
charge amount, see the refrigerant
Air Conditioning Refrigerant R134a
caution label located under the hood.
See your dealer for more information.
Cooling System
Engine Torque below 660 lb ft (LYA, LYB, LYC) 33.6 qt 31.8 L
Engine Torque above 835 lb ft (LYD, LQF) 35.0 qt 33.1 L
Engine Oil with Filter* 23.8 qt 22.5 L
*Additional oil is required with auxiliary oil filter systems. Make sure to add enough extra oil to fill the auxiliary oil
filter system. For vehicles equipped with LUBERFINER 750-C, add 14 quarts (13.2 L).

285

Downloaded from www.Manualslib.com manuals search engine

 Capacities and Specifications (cont’d)
Capacities
Application
English Metric
Fuel Tank
Standard (Single) 50.0 gal 189.3 L
1
Optional (Single) 50.0 gal 189.3 L
2
Optional (Dual) 75.0 gal 283.9 L
3
Optional (Dual) 100.0 gal 378.5 L
1
Single 50-gallon (189 L) tanks. Not applicable to 4X2 vehicles with 128 inch or 140 inch wheelbases and not
applicable to 6x4 vehicles with a 152 inch wheelbase.
2
One 25-gallon (94.6 L) tank and one 50-gallon (189.2 L) tank. Available only on 4x2 vehicles with 128 inch or
140 inch wheelbases or 6x4 vehicles with a 152 inch wheelbase.
3
Two 50-gallon (189 L) tanks. Not applicable to 4X2 vehicles with 128 inch or 140 inch wheelbases and not
applicable to 6x4 vehicles with a 152 inch wheelbase.
Rear Axle – Single Speed
15040S 21.0 pt 10.0 L
19060S (HPK); 21060S (HPP) 31.0 pt 14.7 L
23090S (HPT) 42.5 pt 20.1 L
26105S (HPA) 51.0 pt 24.1 L
S110 (HD2) 15.0 pt 7.1 L

286

Downloaded from www.Manualslib.com manuals search engine

 Capacities and Specifications (cont’d)
Capacities
Application
English Metric
Rear Axle – Tandem
DS404 (front) (HPE); RS404 (rear) 32.0 pt 15.1 L
Rear Axle – Two-Speed
19060T (HPL); 21060T (H15) 38.0 pt 18.0 L
23080T (H25) 44.0 pt 20.8 L
Transmission Fluid, Automatic
2200 Series; 2350 Series, 2500 Series, 2550 Series 40.0 pt* 19.0 L*
MD 3000; MD 3500 with PTO Provision 59.8 pt 28.1 L
MD 3000; MD 3500 without PTO Provision 52.0 pt 24.6 L
*Add 2 pints (1 L) when changing spin-on or remote filter.
See the Allison Automatic Transmission Operator’s Manual for fluid check and maintenance information.
Transmission Fluid, Manual
FS5406; FS6406 19.5 pt 9.2 L
RT8709B 26.0 pt 12.3 L
RT8908LL 28.0 pt 13.2 L
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this
manual. Recheck the fluid level after filling.

287

Downloaded from www.Manualslib.com manuals search engine

 Engine Specifications
Engine RPO Type Firing Order
Isuzu 6H LF8 L6 1–5–3–6–2–4

Normal Maintenance Replacement Parts

Part Part Number
Air Compressor Filter (Haldex Air Compressor) 100696-E1
Oil Filter 943924752
Engine Air Cleaner/Filter P5339303
Chassis Mounted Fuel Filter 15725783†
Engine Mounted Fuel Filter 980260372
1
Haldex
2
GM part number
3
Donaldson
†Racor

288

Downloaded from www.Manualslib.com manuals search engine

 Engine Drive Belt Routing Belt routing for non air conditioning option shown.
Dotted line shows routing for vehicles with air
conditioning.

Isuzu 6H Diesel Engine

289

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

290

Downloaded from www.Manualslib.com manuals search engine

 Section 6 Maintenance Schedule
Maintenance Schedule ................................ 292 Scheduled Maintenance ............................. 295
Introduction ............................................... 292 Part B: Owner Checks and Services ......... 315
Maintenance Requirements ........................ 292 At Each Fuel Fill ....................................... 315
Your Vehicle and the Environment ............ 292 At Least Twice a Year .............................. 316
How This Section is Organized ................. 293 At Least Once a Year ............................... 320
Part A: Scheduled Maintenance Services ... 294 Part C: Recommended Fluids and
Using the Maintenance Schedule ............... 294 Lubricants .............................................. 321
Scheduled Maintenance Supplements ........ 295 Part D: Maintenance Record ..................... 323

291

Downloaded from www.Manualslib.com manuals search engine

 Maintenance Schedule Maintenance Requirements
Maintenance intervals, checks, inspections and
Introduction recommended fluids and lubricants as prescribed in
this manual are necessary to keep your vehicle in
Important: Keep engine oil at the proper level good working condition. Any damage caused by
and change as recommended. failure to follow scheduled maintenance may not be
covered by warranty.

Your Vehicle and the Environment

Proper vehicle maintenance not only helps to
keep your vehicle in good working condition, but
also helps the environment. Improper vehicle
maintenance can even affect the quality of the air
Have you purchased the GM Protection Plan? The we breathe. Improper fluid levels or the wrong tire
Plan supplements your new vehicle warranties. inflation can increase the level of emissions from
See your Warranty and Owner Assistance booklet your vehicle. To help protect our environment, and
or your dealer for details. to keep your vehicle in good condition, be sure to
maintain your vehicle properly.

292

Downloaded from www.Manualslib.com manuals search engine

 How This Section is Organized
CAUTION: (Continued)
This maintenance schedule is divided into
four parts: proper tools and equipment for the job.
“Part A: Scheduled Maintenance Services” If you have any doubt, have a qualified
explains what to have done and how often. technician do the work. See Doing Your
Some of these services can be complex, so Own Service Work on page 193.
unless you are technically qualified and have
the necessary equipment, you should let
your dealer/retailer do these jobs. If you want to purchase service information, see
Service Publications Ordering Information on
Your dealer/retailer has trained and supported
page 338.
service people that will perform the work
using genuine parts. “Part B: Owner Checks and Services” tells you
what should be checked and when. It also explains
what you can easily do to keep your vehicle in good
{CAUTION: condition.
“Part C: Recommended Fluids and Lubricants”
Performing maintenance work on a lists some recommended products necessary to
vehicle can be dangerous. In trying to do help keep your vehicle properly maintained. These
some jobs, you can be seriously injured. products, or their equivalents, should be used
Do your own maintenance work only if whether you do the work yourself or have it done.
you have the required know-how and the “Part D: Maintenance Record” is a place for
you to record and keep track of the maintenance
CAUTION: (Continued) performed on your vehicle. Keep your maintenance
receipts. They may be needed to qualify your
vehicle for warranty repairs.
293

Downloaded from www.Manualslib.com manuals search engine

 Part A: Scheduled Maintenance This part tells you the maintenance services you
should have done and when to schedule them.
Services
When you go to your dealer for your service
In this part are scheduled maintenance services needs, you will know that GM-trained and
which are to be performed at the mileage intervals supported service people will perform the
specified. work using genuine GM parts.
The proper fluids and lubricants to use are listed
Using the Maintenance Schedule in Part C. Make sure whoever services your
vehicle uses these. All parts should be replaced
We at General Motors want to help keep
your vehicle in good working condition. But we do and all necessary repairs done before you or
anyone else drives the vehicle.
not know exactly how you will drive it. You may
drive very short distances only a few times a week. This schedule is for vehicles that:
Or you may drive long distances all the time in • carry passengers and cargo within
very hot, dusty weather. You may use your vehicle recommended limits. You will find limits on your
in making deliveries or in many other ways. vehicle’s Certification or Tire Information label.
Because of all the different ways people use their See Loading Your Vehicle on page 180.
vehicles, maintenance needs vary. You may need • are driven on reasonable road surfaces within
more frequent checks and replacements. So please legal driving limits.
read the following and note how you drive. If you
have any questions on how to keep your vehicle in • use the recommended fuel. See What Fuel to
good condition, see your dealer. Use on page 195.

294

Downloaded from www.Manualslib.com manuals search engine

 Scheduled Maintenance 1,000 Miles (1 600 km)
Supplements ❑ Wheel stud nut service. (30)
❑ Rear axle air shift motor service. (9)
If your vehicle has an Allison Transmission®, your
owner manual is supplemented by an Allison 7,500 Miles (12 000 km)
Transmission® Operator’s Manual. Always refer to
these manuals for related maintenance services. ❑ Check fluid levels (or every 3 months,
whichever occurs first). (1) (5)
Scheduled Maintenance ❑ Chassis lubrication service (or every 6 months,
whichever occurs first). (10)
The services shown in this schedule up to ❑ Spring-to-axle U-bolts and shackle bolts
100,000 miles (166 000 km) should be repeated service. (15)
after 100,000 miles (166 000 km) at the same
❑ Wheels and tires service. (13)
intervals for the life of this vehicle. The services
shown after 100,000 miles (166 000 km) should ❑ Hydraulic brake service (or every 6 months,
be repeated at the same miles (km) after whichever occurs first). (6) (30)
those intervals for the life of this vehicle. ❑ Parking brake service (or every 6 months,
The “Footnotes” at the end of this Maintenance whichever occurs first). (7)
Schedule further explain maintenance services. ❑ Air brake service (or every 6 months, whichever
occurs first). (26)
See Service Publications Ordering Information on
page 338. ❑ Air brake automatic slack adjuster service
(or every 500 hours, whichever occurs first). (27)
100 Miles (160 km) ❑ Check air brake relay valve operation and check
❑ Wheel stud nut service. (30) for leaks (or every month, or every 300 hours,
whichever occurs first).

295

Downloaded from www.Manualslib.com manuals search engine

 ❑ Clean air brake application valve (or every ❑ Check fluid levels (or every 3 months, whichever
3 months, or every 300 hours, whichever occurs occurs first). (1) (5)
first). Lubricate linkage. ❑ Replace fuel filter (or every 750 hours of engine
❑ Air brake chamber service (or every 2 months, operation, whichever occurs first).
whichever occurs first). (28) ❑ Steering system service. (11)
15,000 Miles (24 000 km) ❑ Front and rear suspension service. (12)
❑ Vehicles Without Engine Oil Life System Only: ❑ Spring-to-axle U-bolts and shackle bolts
Change engine oil and filter (or every 12 months, service. (14)
or every 750 hours of engine operation, ❑ Exhaust system service (or every 6 months,
whichever occurs first). (2) whichever occurs first). (2) (3) (15)
❑ Vehicles With Engine Oil Life System Only: ❑ Wheels and tires service. (13)
Check oil life system (or every 12 months, or ❑ Hydraulic brake service (or every 6 months,
every 750 hours of engine operation, whichever whichever occurs first). (6) (30)
occurs first). If engine oil and filter are changed,
❑ Parking brake service (or every 6 months,
reset system. See Engine Oil Life System on
whichever occurs first). (7)
page 209. (2) (8)
❑ Air brake service (or every 6 months, whichever
❑ Inspect engine air cleaner filter change indicator.
occurs first). (26)
If necessary, replace the filter. If vehicle is driven
in dusty/dirty conditions, inspect filter change ❑ Air brake automatic slack adjuster service
indicator at every engine oil change. See Engine (or every 500 hours, whichever occurs first). (27)
Air Cleaner/Filter on page 211 for more ❑ Check air brake relay valve operation and check
information. for leaks (or every month, or every 300 hours,
❑ Chassis lubrication service (or every 6 months, whichever occurs first).
whichever occurs first). (10)

296

Downloaded from www.Manualslib.com manuals search engine

 ❑ Clean air brake application valve (or every ❑ Cooling system service. Clean the cooling
3 months, or every 300 hours, whichever system filter cap with clean water, clean the
occurs first). Lubricate linkage. core, pressure test the cap and the system for
❑ Air brake chamber service (or every 2 months, proper pressure capability, and inspect the
whichever occurs first). (28) condition of cooling and heater hoses and
clamps. Replace hoses if cracked, swollen,
❑ Air compressor dry element pleated paper air or damaged.
strainer service (or every 2 months, or every
800 hours, whichever occurs first). ❑ Wheels and tires service. (13)
❑ Thermostatically controlled engine cooling fan ❑ Hydraulic brake service (or every 6 months,
service. (3) (17) whichever occurs first). (6) (30)
❑ Shields and underhood insulation ❑ Parking brake service (or every 6 months,
service. (3) (4) (18) whichever occurs first). (7)
❑ Air brake service (or every 6 months, whichever
22,500 Miles (36 000 km) occurs first). (26)
❑ Check fluid levels (or every 3 months, ❑ Air brake automatic slack adjuster service
whichever occurs first). (1) (5) (or every 500 hours, whichever occurs first). (27)
❑ Chassis lubrication service (or every 6 months, ❑ Check air brake relay valve operation and check
whichever occurs first). (10) for leaks (or every month, or every 300 hours,
❑ Inspect door hinge pins and bushings and whichever occurs first).
replace as necessary. ❑ Clean air brake application valve (or every
3 months, or every 300 hours, whichever
occurs first). Lubricate linkage.
❑ Air brake chamber service (or every 2 months,
whichever occurs first). (28)

297

Downloaded from www.Manualslib.com manuals search engine

 ❑ Air brake system valve service (or every ❑ Inspect engine air cleaner filter change indicator.
3 months, or every 900 hours, whichever If necessary, replace the filter. If vehicle is driven
occurs first). (31) in dusty/dirty conditions, inspect filter change
❑ Air intake system service (or every 24 months, indicator at every engine oil change. See Engine
whichever occurs first). (3) (4) (20) Air Cleaner/Filter on page 211 for more
information.
❑ Rear axle air shift motor service. (9)
❑ Check fluid levels (or every 3 months, whichever
24,000 Miles (40 000 km) occurs first). (1) (5)
❑ Lubricate U-joints (or every 6 months, ❑ Replace fuel filter (or every 750 hours of engine
whichever occurs first). operation, whichever occurs first).
❑ Chassis lubrication service (or every 6 months,
30,000 Miles (48 000 km) whichever occurs first). (10)
❑ Vehicles Without Engine Oil Life System Only: ❑ Steering system service. (11)
Change engine oil and filter (or every 12 months,
or every 750 hours of engine operation, ❑ Front and rear suspension service. (12)
whichever occurs first). (2) ❑ Spring-to-axle U-bolts and shackle bolts
❑ Vehicles With Engine Oil Life System Only: service. (14)
Check oil life system (or every 12 months, or ❑ Exhaust system service (or every 6 months,
every 750 hours of engine operation, whichever whichever occurs first). (2) (3) (15)
occurs first). If engine oil and filter are changed, ❑ Wheel bearing (grease type) service (and
reset system. See Engine Oil Life System on whenever hubs are removed). (19) (30)
page 209. (2) (8) ❑ Wheels and tires service. (13)
❑ Hydraulic brake service (or every 6 months,
whichever occurs first). (6) (30)

298

Downloaded from www.Manualslib.com manuals search engine

 ❑ Parking brake service (or every 6 months, 37,500 Miles (60 000 km)
whichever occurs first). (7)
❑ Check fluid levels (or every 3 months,
❑ Air brake service (or every 6 months, whichever whichever occurs first). (1) (5)
occurs first). (26)
❑ Chassis lubrication service (or every 6 months,
❑ Air brake automatic slack adjuster service whichever occurs first). (10)
(or every 500 hours, whichever occurs first). (27)
❑ Wheels and tires service. (13)
❑ Check air brake relay valve operation and check
❑ Hydraulic brake service (or every 6 months,
for leaks (or every month, or every 300 hours,
whichever occurs first). (6) (30)
whichever occurs first).
❑ Parking brake service (or every 6 months,
❑ Clean air brake application valve (or every
whichever occurs first). (7)
3 months, or every 300 hours, whichever
occurs first). Lubricate linkage. ❑ Air brake service (or every 6 months, whichever
occurs first). (26)
❑ Air brake chamber service (or every 2 months,
whichever occurs first). (28) ❑ Air brake automatic slack adjuster service
(or every 500 hours, whichever occurs first). (27)
❑ Air compressor dry element pleated paper air
strainer service (or every 2 months, or every ❑ Check air brake relay valve operation and check
800 hours, whichever occurs first). for leaks (or every month, or every 300 hours,
whichever occurs first).
❑ Thermostatically controlled engine cooling fan
service. (3) (17) ❑ Clean air brake application valve (or every
3 months, or every 300 hours, whichever
❑ Shields and underhood insulation
occurs first). Lubricate linkage.
service. (3) (4) (18)
❑ Air brake chamber service (or every 2 months,
whichever occurs first). (28)

299

Downloaded from www.Manualslib.com manuals search engine

 45,000 Miles (72 000 km) ❑ Cooling system service. Clean the cooling
system filler cap with clean water, clean the
❑ Vehicles Without Engine Oil Life System Only: core, pressure test the cap and the system for
Change engine oil and filter (or every 12 months, proper pressure capability, and inspect the
or every 750 hours of engine operation, condition of cooling and heater hoses and
whichever occurs first). (2) clamps. Replace hoses if cracked, swollen,
❑ Vehicles With Engine Oil Life System Only: or damaged.
Check oil life system (or every 12 months, or ❑ Inspect door hinge pins and bushings and
every 750 hours of engine operation, whichever replace as necessary.
occurs first). If engine oil and filter are changed,
reset system. See Engine Oil Life System on ❑ Steering system service. (11)
page 209. (2) (8) ❑ Front and rear suspension service. (12)
❑ Inspect engine air cleaner filter change indicator. ❑ Spring-to-axle U-bolts and shackle bolts
If necessary, replace the filter. If vehicle is driven service. (14)
in dusty/dirty conditions, inspect filter change ❑ Exhaust system service (or every 6 months,
indicator at every engine oil change. See Engine whichever occurs first). (2) (3) (15)
Air Cleaner/Filter on page 211 for more
information. ❑ Wheels and tires service. (13)
❑ Hydraulic brake service (or every 6 months,
❑ Check fluid levels (or every 3 months, whichever
occurs first). (1) (5) whichever occurs first). (6) (30)
❑ Parking brake service (or every 6 months,
❑ Replace fuel filter (or every 750 hours of engine
whichever occurs first). (7)
operation, whichever occurs first).
❑ Chassis lubrication service (or every 6 months, ❑ Air brake service (or every 6 months, whichever
whichever occurs first). (10) occurs first). (26)
❑ Air brake automatic slack adjuster service
(or every 500 hours, whichever occurs first). (27)

300

Downloaded from www.Manualslib.com manuals search engine

 ❑ Check air brake relay valve operation and check 50,000 Miles (80 000 km)
for leaks (or every month, or every 300 hours,
❑ Inspect air compressor discharge port (or every
whichever occurs first).
6 months or every 1,800 hours, whichever
❑ Clean air brake application valve (or every occurs first.)
3 months, or every 300 hours, whichever occurs
first). Lubricate linkage. 52,500 Miles (84 000 km)
❑ Air brake chamber service (or every 2 months, ❑ Check fluid levels (or every 3 months,
whichever occurs first). (28) whichever occurs first). (1) (5)
❑ Air brake system valve service (or every ❑ Chassis lubrication service (or every 6 months,
3 months, or every 900 hours, whichever whichever occurs first). (10)
occurs first). (31) ❑ Wheels and tires service. (13)
❑ Air compressor dry element pleated paper air ❑ Hydraulic brake service (or every 6 months,
strainer service (or every 2 months, or every whichever occurs first). (6) (30)
800 hours, whichever occurs first).
❑ Parking brake service (or every 6 months,
❑ Thermostatically controlled engine cooling fan whichever occurs first). (7)
service. (3) (17)
❑ Air brake service (or every 6 months, whichever
❑ Shields and underhood insulation occurs first). (26)
service. (3) (4) (18)
❑ Air brake automatic slack adjuster service
❑ Rear axle air shift motor service. (9) (or every 500 hours, whichever occurs first). (27)
❑ Air intake system service (or every 24 months, ❑ Check air brake relay valve operation and check
whichever occurs first). (3) (4) (20) for leaks (or every month, or every 300 hours,
48,000 Miles (75 000 km) whichever occurs first).
❑ Lubricate U-joints (or every 6 months,
whichever occurs first).

301

Downloaded from www.Manualslib.com manuals search engine

 ❑ Clean air brake application valve (or every ❑ Replace fuel filter (or every 750 hours of engine
3 months, or every 300 hours, whichever occurs operation, whichever occurs first).
first). Lubricate linkage. ❑ Chassis lubrication service (or every 6 months,
❑ Air brake chamber service (or every 2 months, whichever occurs first). (10)
whichever occurs first). (28) ❑ Inspect door hinge pins and bushings and
60,000 Miles (96 000 km) replace as necessary.
❑ Steering system service. (11)
❑ Vehicles Without Engine Oil Life System Only:
Change engine oil and filter (or every 12 months, ❑ Front and rear suspension service. (12)
or every 750 hours of engine operation, ❑ Spring-to-axle U-bolts and shackle bolts
whichever occurs first). (2) service. (14)
❑ Vehicles With Engine Oil Life System Only: ❑ Exhaust system service (or every 6 months,
Check oil life system (or every 12 months, or whichever occurs first). (2) (3) (15)
every 750 hours of engine operation, whichever ❑ Wheel bearing (grease type) service (and
occurs first). If engine oil and filter are changed, whenever hubs are removed). (19) (30)
reset system. See Engine Oil Life System on
❑ Wheels and tires service. (13)
page 209. (2) (8)
❑ Adjust valve lash (or every 2,625 hours of engine
❑ Inspect engine air cleaner filter change indicator.
operation, whichever occurs first). (16)
If necessary, replace the filter. If vehicle is driven
in dusty/dirty conditions, inspect filter change ❑ Hydraulic brake service (or every 6 months,
indicator at every engine oil change. See Engine whichever occurs first). (6) (30)
Air Cleaner/Filter on page 211 for more ❑ Parking brake service (or every 6 months,
information. whichever occurs first). (7)
❑ Check fluid levels (or every 3 months, whichever ❑ Air brake service (or every 6 months, whichever
occurs first). (1) (5) occurs first). (26)

302

Downloaded from www.Manualslib.com manuals search engine

 ❑ Air brake automatic slack adjuster service (or ❑ Cooling system service. Clean the cooling
every 500 hours, whichever occurs first). (27) system filler cap with clean water, clean
❑ Check air brake relay valve operation and check the core, pressure test the cap and the system
for leaks (or every month, or every 300 hours, for proper pressure capability, and inspect
whichever occurs first). the condition of cooling and heater hoses and
clamps. Replace hoses if cracked, swollen,
❑ Clean air brake application valve (or every or damaged.
3 months, or every 300 hours, whichever occurs
first). Lubricate linkage. ❑ Wheels and tires service. (13)
❑ Air brake chamber service (or every 2 months, ❑ Hydraulic brake service (or every 6 months,
whichever occurs first). (28) whichever occurs first). (6) (30)
❑ Air compressor dry element pleated paper air ❑ Parking brake service (or every 6 months,
strainer service (or every 2 months, or every whichever occurs first). (7)
800 hours, whichever occurs first). ❑ Air brake service (or every 6 months, whichever
❑ Thermostatically controlled engine cooling fan occurs first). (26)
service. (3) (17) ❑ Air brake automatic slack adjuster service (or
❑ Shields and underhood insulation every 500 hours, whichever occurs first). (27)
service. (3) (4) (18) ❑ Check air brake relay valve operation and check
for leaks (or every month, or every 300 hours,
67,500 Miles (108 000 km) whichever occurs first).
❑ Check fluid levels (or every 3 months, ❑ Clean air brake application valve (or every
whichever occurs first). (1) (5) 3 months, or every 300 hours, whichever occurs
❑ Chassis lubrication service (or every 6 months, first). Lubricate linkage.
whichever occurs first). (10) ❑ Air brake chamber service (or every 2 months,
whichever occurs first). (28)

303

Downloaded from www.Manualslib.com manuals search engine

 ❑ Air brake system valve service (or every ❑ Inspect engine air cleaner filter change indicator.
3 months, or every 900 hours, whichever occurs If necessary, replace the filter. If vehicle is driven
first). (31) in dusty/dirty conditions, inspect filter change
❑ Rear axle air shift motor service. (9) indicator at every engine oil change. See Engine
Air Cleaner/Filter on page 211 for more
❑ Air intake system service (or every 24 months, information.
whichever occurs first). (3) (4) (20)
❑ Chassis lubrication service (or every 6 months,
72,000 Miles (115 000 km) whichever occurs first). (10)
❑ Lubricate U-joints (or every 6 months, ❑ Check fluid levels (or every 3 months, whichever
whichever occurs first). occurs first). (1) (5)
❑ Replace fuel filter (or every 750 hours of engine
75,000 Miles (120 000 km) operation, whichever occurs first).
❑ Vehicles Without Engine Oil Life System Only: ❑ Steering system service. (11)
Change engine oil and filter (or every 12 months,
or every 750 hours of engine operation, ❑ Front and rear suspension service. (12)
whichever occurs first). (2) ❑ Spring-to-axle U-bolts and shackle bolts
❑ Vehicles With Engine Oil Life System Only: service. (14)
Check oil life system (or every 12 months, or ❑ Exhaust system service (or every 6 months,
every 750 hours of engine operation, whichever whichever occurs first). (2) (3) (15)
occurs first). If engine oil and filter are changed, ❑ Wheels and tires service. (13)
reset system. See Engine Oil Life System on
❑ Hydraulic brake service (or every 6 months,
page 209. (2) (8) whichever occurs first). (6) (30)
❑ Parking brake service (or every 6 months,
whichever occurs first). (7)

304

Downloaded from www.Manualslib.com manuals search engine

 ❑ Air brake service (or every 6 months, whichever 82,500 Miles (132 000 km)
occurs first). (26)
❑ Check fluid levels (or every 3 months,
❑ Air brake automatic slack adjuster service (or whichever occurs first). (1) (5)
every 500 hours, whichever occurs first). (27)
❑ Chassis lubrication service (or every 6 months,
❑ Check air brake relay valve operation and check whichever occurs first). (10)
for leaks (or every month, or every 300 hours,
❑ Wheels and tires service. (13)
whichever occurs first).
❑ Hydraulic brake service (or every 6 months,
❑ Clean air brake application valve (or every
whichever occurs first). (6) (30)
3 months, or every 300 hours, whichever occurs
first). Lubricate linkage. ❑ Parking brake service (or every 6 months,
whichever occurs first). (7)
❑ Air brake chamber service (or every 2 months,
whichever occurs first). (28) ❑ Air brake service (or every 6 months, whichever
occurs first). (26)
❑ Air compressor dry element pleated paper air
strainer service (or every 2 months, or every ❑ Air brake automatic slack adjuster service (or
800 hours, whichever occurs first). every 500 hours, whichever occurs first). (27)
❑ Fuel tank, fuel cap, and fuel lines service ❑ Check air brake relay valve operation and check
(or every 72 months, whichever occurs for leaks (or every month, or every 300 hours,
first). (2) (21) † whichever occurs first).
❑ Thermostatically controlled engine cooling fan ❑ Clean air brake application valve (or every
service. (3) (17) 3 months, or every 300 hours, whichever
occurs first). Lubricate linkage.
❑ Shields and underhood insulation
service. (3) (4) (18) ❑ Air brake chamber service (or every 2 months,
whichever occurs first). (28)

305

Downloaded from www.Manualslib.com manuals search engine

 90,000 Miles (144 000 km) ❑ Cooling system service. Clean the cooling
system filler cap with clean water, clean the
❑ Vehicles Without Engine Oil Life System Only: core, pressure test the cap and the system for
Change engine oil and filter (or every 12 months, proper pressure capability, and inspect the
or every 750 hours of engine operation, condition of cooling and heater hoses and
whichever occurs first). (2) clamps. Replace hoses if cracked, swollen,
❑ Vehicles With Engine Oil Life System Only: or damaged.
Check oil life system (or every 12 months, or ❑ Steering system service. (11)
every 750 hours of engine operation, whichever
occurs first). If engine oil and filter are changed, ❑ Front and rear suspension service. (12)
reset system. See Engine Oil Life System on ❑ Spring-to-axle U-bolts and shackle bolts
page 209. (2) (8) service. (14)
❑ Inspect engine air cleaner filter change indicator. ❑ Exhaust system service (or every 6 months,
If necessary, replace the filter. If vehicle is driven whichever occurs first). (2) (3) (15)
in dusty/dirty conditions, inspect filter change ❑ Inspect door hinge pins and bushings and
indicator at every engine oil change. See Engine replace as necessary.
Air Cleaner/Filter on page 211 for more
information. ❑ Wheel bearing (grease type) service (and
whenever hubs are removed). (19) (30)
❑ Check fluid levels (or every 3 months, whichever
occurs first). (1) (5) ❑ Wheels and tires service. (13)
❑ Hydraulic brake service (or every 6 months,
❑ Replace fuel filter (or every 750 hours of engine
whichever occurs first). (6) (30)
operation, whichever occurs first).
❑ Chassis lubrication service (or every 6 months, ❑ Parking brake service (or every 6 months,
whichever occurs first). (10) whichever occurs first). (7)
❑ Air brake service (or every 6 months, whichever
occurs first). (26)

306

Downloaded from www.Manualslib.com manuals search engine

 ❑ Air brake automatic slack adjuster service (or 96,000 Miles (152 000 km)
every 500 hours, whichever occurs first). (27)
❑ Lubricate U-joints (or every 6 months,
❑ Check air brake relay valve operation and check whichever occurs first).
for leaks (or every month, or every 300 hours,
whichever occurs first). 97,500 Miles (156 000 km)
❑ Clean air brake application valve (or every ❑ Check fluid levels (or every 3 months,
3 months, or every 300 hours, whichever occurs whichever occurs first). (1) (5)
first). Lubricate linkage. ❑ Chassis lubrication service (or every 6 months,
❑ Air brake chamber service (or every 2 months, whichever occurs first). (10)
whichever occurs first). (28) ❑ Wheels and tires service. (13)
❑ Air brake system valve service (or every
3 months, or every 900 hours, whichever 100,000 Miles (160 000 km)
occurs first). (31) ❑ Inspect engine drive belt; replace as necessary.
❑ Air compressor dry element pleated paper air ❑ Change power steering fluid (or every
strainer service (or every 2 months, or every 36 months, whichever occurs first). (11)
800 hours, whichever occurs first). ❑ Replace power steering reservoir filter element
❑ Thermostatically controlled engine cooling fan (or every 24 months, whichever occurs first).
service. (3) (17) ❑ Wheel bearing (oil type) service (and whenever
❑ Shields and underhood insulation hubs are removed). (19) (30)
service. (3) (4) (18) ❑ Front axle service. (25)
❑ Rear axle air shift motor service. (9) ❑ Rear axle service – Eaton®, Rockwell®, Spicer®
❑ Air intake system service (or every 24 months, axles (or every 12 months, whichever occurs
whichever occurs first). (3) (4) (20) first). (24)

307

Downloaded from www.Manualslib.com manuals search engine

 ❑ Exhaust brake service, if equipped. Check 200,000 Miles (320 000 km)
for excessive spindle free play and smooth
❑ Rear axle service – Eaton®, Rockwell®, Spicer®
operation. Lubricate ball joint cap.
axles (or every 12 months, whichever occurs
❑ Inspect air compressor discharge port (or every first). (24)
6 months or every 1,800 hours, whichever
❑ Remove, disassemble, clean, and inspect the
occurs first).
air brake trailer supply valve (or every 2 years,
❑ Trailer brake hand control valve service or every 7,200 hours, whichever occurs first).
(or every 12 months, or every 3,600 hours,
❑ Inspect engine drive belt; replace as necessary.
whichever occurs first). (29)
❑ Diesel Particulate Filter (DPF) service (or every
150,000 Miles (240 000 km) 4,500 hours, whichever occurs first). Then, every
❑ Cooling system service (or every 60 months 10,000 miles (16 000 km), or every 12 months,
since last service, whichever occurs or every 3,000 hours, whichever occurs first. (32)
first). (2) (23) 250,000 Miles (400 000 km)
❑ Inspect engine drive belt; replace as necessary.
❑ Diesel Particulate Filter (DPF) service (or every
❑ Diesel Particulate Filter (DPF) service (or every 4,500 hours, whichever occurs first). Then, every
4,500 hours, whichever occurs first). Then, every 10,000 miles (16 000 km), or every 12 months,
10,000 miles (16 000 km), or every 12 months, or every 3,000 hours, whichever occurs first. (32)
or every 3,000 hours, whichever occurs first. (32)

308

Downloaded from www.Manualslib.com manuals search engine

 300,000 Miles (480 000 km) (2) = An Emission Control Service.
❑ Rear axle service – Eaton , Rockwell , Spicer
® ® ®
(3) = A Noise Emission Control Device.
axles (or every 12 months, whichever occurs (4) = Applies to vehicles sold in the United States
first). (24) and is recommended for vehicles sold in Canada.
❑ Remove, disassemble, clean, and inspect the
air brake air dryer (or every 3 years, or (5) = Check fluid level in brake master cylinder,
10,800 hours, whichever occurs first). power steering pump, front and rear axles,
Replace desiccant. transmission, and hydraulic spring parking brake
pump, if equipped. A low fluid level in the brake
❑ Diesel Particulate Filter (DPF) service (or every master cylinder can indicate worn brake linings
4,500 hours, whichever occurs first). Then, every and should be checked accordingly.
10,000 miles (16 000 km), or every 12 months,
or every 3,000 hours, whichever occurs first. (32) (6) = Inspect brake lines and hoses for proper
hook-up, binding, leaks, cracks, chafing, etc.
Footnotes Inspect disc brake pads for wear and rotors for
† = The U.S. Environmental Protection Agency or surface condition. Inspect caliper assemblies.
the California Air Resources Board has determined Check brake pedal for excessive free play or travel
that the failure to perform this maintenance item (or every 6 months, whichever occurs first) and
will not nullify the emission warranty or limit recall have serviced if needed. Check brakes more often
liability prior to the completion of the vehicle’s useful if driving habits and conditions result in frequent
life. We, however, urge that all recommended braking.
maintenance services be performed at the indicated (7) = Inspect parking brake drum and linings for
intervals and the maintenance be recorded. wear or cracks and check linkage and adjustment.
(1) = If your vehicle has an Allison Transmission®,
your owner manual is supplemented by an Allison
Transmission® Operator’s Manual. Always refer to
these manuals for related maintenance services.

309

Downloaded from www.Manualslib.com manuals search engine

 (8) = This vehicle has the Engine Oil Life System. (10) = Chassis Lubrication Service: Lubricate all
This system will show you when to change the grease fittings in front suspension, front axle, and
engine oil and filter – usually between 3,000 miles steering linkage. Do not lubricate kingpin bushings
(5 000 km) and 15,000 miles (24 000 km) since with air pressure equipment; instead, use a hand
your last oil change. Under severe conditions, grease gun to ensure complete purge and eliminate
the indicator may come on before 3,000 miles sealer cap distortion. Front axle tie rod ends, both
(5 000 km). Never drive your vehicle more than upper and lower kingpin fittings, and both steering
15,000 miles (24 000 km) or 12 months without linkage relay rod ends should be greased with the
an oil and filter change. vehicle loaded on the ground and wheels turned
Remember to reset the Engine Oil Life System straight ahead, not with the vehicle on a hoist.
whenever the oil is changed. For more information, Apply kingpin bushing lubricant to both upper and
see Engine Oil Life System on page 209. lower kingpin grease fittings until new lubricant
purges from between the upper shim pack and
(9) = Inspect rear axle air shift motor for fluid thrust bearing. Lubricate transmission and shift
leaks. Remove plug to check fluid level. Inspect linkage, tilt cab hinges and latches, parking brake
air lines and hoses for proper hook-up, binding, lever pivot, clevis pins and linkage, disc brake
leaks, etc. Inspect at 1,000 miles (1 600 km) caliper rails, bearing pads, propshaft universal
and 22,500 miles (36 000 km) and then every joints, brake camshaft bracket, slack adjusters,
22,500 miles (36 000 km) thereafter. and pedal shaft. Lubricate suspension, axle, and
steering linkage more often when operating under
dusty or muddy conditions and in excessive off-road
use. Frequently power-washed vehicles will require
more frequent lubrication.

310

Downloaded from www.Manualslib.com manuals search engine

 (11) = Check steering system: (13) = Adjust tire pressures as indicated on the
• Look for damaged, loose, or missing parts. Certification or Tire Information label for optimum
Inspect the steering linkage relay rod and tire life. See Tires on page 254 for further details.
tie rod ends for looseness or lack of lubricant. Check tires for excessive or abnormal wear or
Also look for parts showing signs of wear damage. Also check for damaged wheels. Replace
or lack of lubrication. Replace parts as wheels and/or tires as needed.
needed. Also check steering gear mounting (14) = Check spring-to-axle U-bolts and shackle
bolts, pitman arm nut, gear housing upper bolts for proper torque. See the service manual for
cover and side cover attaching bolts, steering torque sequence and specifications. When parts
column mounting bolts, and cardan joint are replaced, the torque must be checked and
clamp bolts; tighten if necessary. See the adjusted more often during the first 6,000 miles
service manual. (10 000 km). Check torque at 500 miles (800 km)
• Inspect power steering hoses, tubes, and and 2,000 miles (3 000 km) after first use of parts.
fittings for leaks. Hoses and lines must not (15) = Check complete exhaust system, including
be twisted, kinked, or tightly bent. Make sure DPF pressure lines, and cab areas near the
clips, clamps, supporting tubes, and hoses exhaust system for broken, damaged, missing, or
are in place and properly secured. out-of-position parts. Also inspect for open seams,
• Check steering gear for leakage around holes, loose connections, or other conditions which
pitman shaft and housing. If leakage is evident could let exhaust fumes seep into the driver
(lubricant oozing out, not just oily film), leak compartment. Needed repairs should be made at
should be corrected immediately. once. To help maintain system integrity, replace
exhaust pipes whenever a new muffler is put on.
(12) = Check front and rear suspension. Look for
damaged, loose or missing parts or parts showing (16) = Adjust valve lash. Incorrect valve clearance
signs of wear or lack of lubrication. Replace parts will result in increased engine noise and reduced
as needed. engine output.

311

Downloaded from www.Manualslib.com manuals search engine

 (17) = With the engine off and below normal (20) = Check the air intake system installation to
operating temperature, check to see that see that gaskets are seated properly and all hose
the thermostatically controlled engine cooling connections, fasteners, and other components are
fan can be rotated by hand on viscous-operated tight. Tighten connections and fasteners or replace
drives. Replace as needed. parts as required.
(18) = Check shields and underhood insulation (21) = Check the fuel tank, fuel cap, and fuel lines
for damage or looseness. Adjust or replace for damage which could cause leakage. Inspect fuel
as needed. cap for correct sealing ability and any indications of
(19) = Wheel bearing service: damage. Check fuel cap gasket for even filler neck
imprint. Replace parts as needed.
• Grease type – Clean, inspect, and lubricate
with the proper wheel bearing grease at (22) = Inspect Electronic Vacuum Regulator Valve
designated intervals or when hubs are (EVRV) filter for excessive contamination or
removed. See Part C: Recommended plugging. If needed, clean filter with solution
Fluids and Lubricants on page 321. of soap and water, let dry and install.
• Oil-filled type – Some wheel bearings are (23) = Drain, flush, and refill cooling system. This
lubricated by axle lubricant. When you have service can be complex; you should have your
oil-filled hubs, use lubricant identical to that dealer/retailer perform this service. See Part
used in the axle. Lubricant change intervals C: Recommended Fluids and Lubricants on
are the same for front and rear axles. However, page 321 for what to use. Inspect hoses. Clean
you must maintain the proper oil level between radiator, condenser, pressure cap, and neck.
change intervals. See Front Wheel Bearings Pressure test cooling system and pressure cap.
with Oil-Filled Hubs on page 253 and Part C: (24) = Rear axle service: Change the lubricant.
Recommended Fluids and Lubricants on See Part C: Recommended Fluids and Lubricants
page 321. on page 321.

312

Downloaded from www.Manualslib.com manuals search engine

 (25) = Front axle service: Re-pack upper kingpin • Inspect air parking brake chamber for leaks
roller bearing. and damage. Inspect lines and hoses for leaks,
(26) = Air brake service: cracks, chafing, etc. Also check all attachments
for tightness, wear, or damage. Note: The
• Inspect brake lines and hoses for proper spring brake section of the rear brake
hook-up, binding, leaks, cracks, chafing, diaphragms are non-serviceable.
etc. Inspect drum brake linings for wear or
cracks. Inspect other brake parts at each • Replace the air compressor filter element,
wheel, including drums, wheel cylinders mounted on the air compressor. For remote air
and piston heat shields, boots and wheel compressor intake service, refer to engine air
speed sensor wiring. Check brake pedal cleaner filter replacement.
for excessive free play or travel (or every • Remove, disassemble, clean, and inspect the
6 months, whichever occurs first) and have safety valve, service brake chambers, quick
serviced if needed. Check brakes more often if release valve, quick release/double check
driving habits and conditions result in frequent valve combination, parking brake control valve,
braking. Replace air dryer cartridge only if double check valve, pressure protection valve,
excessive oil or moisture is present. A small and ether injector.
amount of oil in the system is normal and • Remove, disassemble, and clean the
should not be considered as a reason to application valve; replace parts showing wear.
replace the cartridge.
• Remove, disassemble, clean, and inspect
• Test air lines for leaks; tighten as needed. the spring brake control valve; replace
Replace compressor filter. rubber parts.

313

Downloaded from www.Manualslib.com manuals search engine

 (27) = Clean and lubricate air brake automatic (31) = Inspect and clean any accumulated dirt,
slack adjuster. Check pushrod travel and gravel, or other foreign objects from the valves and
auto adjustment operation. Have serviced if valve boots as needed. Using light oil, lubricate
needed. brake pedal to brake application valve linkage
(28) = Air brake chamber service: Check operation, components. Check any rubber boots for cracks,
mounting clamps, and air lines and check for holes, or deterioration and replace if necessary.
leaks. (32) = Check for filter ash, sensor adjustment,
(29) = Trailer brake hand control valve service: and sensor hose restriction. Clean as needed.
Check operation; lubricate cam and follower. This service can be complex; you should
have your dealer/retailer perform this service.
(30) = Tighten the wheel stud nuts to the specified
torque values at 100 miles (160 km). Thereafter,
tighten them 1,000 miles (1 600 km) after each
time the wheel is removed. See Tightening
the Wheel Nuts on page 259.

314

Downloaded from www.Manualslib.com manuals search engine

 Part B: Owner Checks and Services At Each Fuel Fill
Listed in this part are owner checks and services It is important for you or a service station attendant
which should be performed at the intervals to perform these underhood checks at each fuel fill.
specified to help ensure the safety, dependability
and emission control performance of your vehicle. Engine Oil Level Check
For your safety and that of others, any of the Check the engine oil level and add the proper oil if
safety-related components that may have been necessary. See Engine Oil on page 206.
damaged in an accident should be checked
and any needed repairs made before operating
Engine Coolant Level Check
the vehicle. Check the engine coolant level and add
At the minimum, these routine checks should be DEX-COOL® coolant mixture if necessary.
made every 6 months or 6,000 miles (10 000 km), See Engine Coolant on page 216.
whichever occurs first. Whenever repairs are Windshield Washer Fluid Level Check
needed, have them completed before operating
the vehicle. Check the windshield washer fluid level in the
windshield washer fluid reservoir and add
the proper fluid if necessary. See Windshield
Washer Fluid on page 226.
Tire Inflation Check
Check tire inflation cold. Make sure the tires are
inflated to the correct pressures. See Loading Your
Vehicle on page 180 and Inflation - Tire Pressure
on page 255.

315

Downloaded from www.Manualslib.com manuals search engine

 At Least Twice a Year Weatherstrip Lubrication
Restraint System Check Silicone grease on weatherstrips will make them
last longer, seal better, and not stick or squeak.
Make sure any safety belt reminder light and Apply silicone grease with a clean cloth. During
safety belt assemblies are working properly. very cold, damp weather more frequent application
Look for any other loose or damaged safety belt may be required. Part C tells you what to use.
system parts. If you see anything that might keep
a safety belt system from doing its job, have it Body Lubrication Service
repaired. Have any torn or frayed safety belts Lubricate all exposed surfaces such as door
replaced. checks, door lock bolts, lock strike plates, door
Wiper Blade Check hinge bushings, latches, and dovetail bumper
wedges. Where oil holes are provided, a dripless
Inspect wiper blades for wear, cracking, or oil can be used. The seat adjusters, seat track,
contamination. Clean the windshield and wiper door weatherstrips, and rubber cap bumpers
blades, if contaminated. Replace wiper blades should also be lubricated. Part C tells you what
that are worn or damaged. See Windshield Wiper to use. More frequent lubrication may be required
Blade Replacement on page 250 and Windshield when exposed to a corrosive environment.
and Wiper Blades on page 272 for more
information. Parking Brake Check
Park on a fairly steep hill and hold the vehicle
with the parking brake only. This checks holding
ability.

316

Downloaded from www.Manualslib.com manuals search engine

 Starter Switch Check Transmission Shift Indicator Check
Check that the indicator points to the gear chosen.
{CAUTION: Steering Check
Be alert for any changes in steering action,
When you are doing this inspection, the abnormal front tire wear, or steering wheel
vehicle could move suddenly. If the vehicle position. An inspection or service is needed
moves, you or others could be injured. when the steering wheel is harder to turn or
has too much free play, or if there are strange
sounds when turning or parking.
1. Before you start, be sure you have enough
room around the vehicle. Brake System Check
2. Firmly apply both the parking brake and the Be alert to the low air warning light or tone alarm,
regular brakes. or changes in braking action, such as repeated
Do not use the accelerator pedal, and be pulling to one side, unusual sounds when braking,
ready to turn off the engine immediately if it or increased brake pedal travel. Make sure air
starts. brake system reservoirs are drained daily with
3. On automatic transmission vehicles, try to start full system air pressure, and check system
the engine in each gear. The starter should for leaks. Any of these conditions could indicate
work only in PARK (P) or NEUTRAL (N). If the the need for brake system inspection and/or
starter works in any other position, your vehicle service.
needs service. On manual transmission
vehicles, the starter should work only when
the clutch pedal is all the way down.

317

Downloaded from www.Manualslib.com manuals search engine

 Engine Cooling System Service Windshield Wipers and Washers Check
Inspect the hoses and have them replaced if they Check operation and condition of the wiper
are cracked, swollen, or deteriorated. Inspect all blades. Check the flow of the washer spray.
pipes, fittings, and clamps; replace as needed.
Clean the outside of the radiator and air Defroster Check
conditioning condenser. To help ensure proper Move the control to the defrost symbol and the fan
operation, a pressure test of the cooling system and to HI or the high symbol. Then check the airflow
pressure cap is recommended at least once a year. from the ducts at the inside base of the windshield.
Exhaust System Inspection Mirrors and Sun Visors Check
Be alert for any changes in the sound of the Check that friction joints hold mirrors and sun
exhaust system or any smell of fumes. These visors in place.
are signs the system may be leaking. Have
it checked and/or repaired at once. See Engine Seat Adjuster Check
Exhaust on page 86 and Running the Engine When adjusting a manual seat, be sure seat
While Parked on page 92. adjusters latch by attempting to move the seat
Check to be sure that mud or dirt is not caked after latching.
on the exhaust system, especially in the area of
the diesel particulate filter and tailpipe. Clean
the area as needed. See Diesel Particulate Filter
on page 87.
At high mileages, the DPF becomes loaded with
ash. This is normal. When the amount of ash
loading is high, see your dealer/retailer for DPF
cleaning or replacement.

318

Downloaded from www.Manualslib.com manuals search engine

 Lamps Check Door Latches Check
Check panel lighting, warning lights, indicator lights, Check that doors close, latch, and lock tightly.
and interior lamps. On the outside, check: license Check for broken, damaged, or missing parts
plate lamps, sidemarker lamps, reflectors or lights that might prevent tight latching.
on outside mirrors, headlamps, parking lamps,
identification and clearance lamps, taillamps, brake Cab Latches Check
lamps, turn signals, backup lamps, and hazard Check that the cab closes firmly. Check for
warning flashers. Have headlamp aim checked at broken, damaged, loose, or missing parts that
once if beams seem improperly aimed. might prevent tight latching.
Glass, Mirrors, Lamps, and/or Fluid Leaks Check
Reflectors Condition Check Check for fuel, coolant, oil, or other fluid leaks by
Look for broken, scratched, dirty, or damaged looking at the surface beneath the vehicle after
glass, mirrors, lamps, or reflectors that could it has been parked for awhile.
reduce the view or visibility or cause injury.
Replace, clean, or repair promptly.

319

Downloaded from www.Manualslib.com manuals search engine

 Underbody Inspection At Least Once a Year
Corrosive materials used for ice, snow removal, Key Lock Cylinders Service
and dust control can collect on the underbody.
If these materials are not removed, accelerated Lubricate the key lock cylinders with the lubricant
corrosion (rust) can occur on underbody parts specified in Part C.
such as fuel lines, frame, floor pan, and exhaust
system. At least every spring, flush these materials Underbody Flushing Service
from the underbody with plain water. Take care At least every spring, use plain water to flush any
to clean well any areas where mud and other corrosive materials from the underbody. Take care
debris can collect. Sediment packed in closed to clean thoroughly any areas where mud and other
areas of the frame should be loosened before debris can collect.
being flushed.
Tractor Protection (Breakaway) Valve
Engine Cover Check Check
Check that the cab’s engine cover and seal, if the
On air brake models, remove, disassemble, clean,
vehicle has one, are not torn or damaged. Be sure
and inspect the tractor protection (breakaway)
that the cover is clamped down firmly to the floor.
valve.

320

Downloaded from www.Manualslib.com manuals search engine

 Part C: Recommended Fluids and Usage Fluid/Lubricant
Lubricants Exhaust Brake High-Temperature Grease
Ball Joint Cap (GM Part No. U.S. 1051344,
Fluids and lubricants identified below by name, in Canada 903037) or NLGI #3
Lubricant consistency.
part number, or specification can be obtained from
your dealer/retailer. Power Steering DEXRON®-VI Automatic
System Transmission Fluid.
Usage Fluid/Lubricant
Automatic See the Allison Transmission®
Engine oils with the letters CJ-4 are Operator’s Manual for correct
Transmission transmission fluid.
required for your vehicle. The CJ-4
designation can appear either
alone or in combination with other Synthetic Manual Transmission Fluid
Manual (GM Part No. U.S. 88861952,
Engine Oil American Petroleum Institute (API) Transmission
designations, such as API CJ-4/SL. in Canada 88861953).
These letters show API levels of
quality. To determine the preferred Hydraulic Clutch Fluid
viscosity for your vehicle’s diesel Hydraulic (GM Part No. U.S. 12345347,
engine, see Engine Oil on page 206. Clutch System in Canada 10953571) or equivalent
DOT-3 brake fluid.
50/50 mixture of clean, drinkable
water and use only DEX-COOL® Key Lock Multi-Purpose Lubricant, Superlube
Engine Coolant Coolant. See Engine Coolant on (GM Part No. U.S. 12346241,
Cylinders
page 216. in Canada 10953474).

Hydraulic Brake Delco® Supreme 11 Brake Fluid or Chassis Lubricant

System equivalent DOT-3 brake fluid. Chassis (GM Part No. U.S. 12377985, in
Lubrication Canada 88901242) or lubricant
Windshield meeting requirements of NLGI #2,
GM Optikleen® Washer Solvent. Category LB or GC-LB.
Washer Solvent

321

Downloaded from www.Manualslib.com manuals search engine

 Usage Fluid/Lubricant Usage Fluid/Lubricant

Front Wheel Wheel bearing lubricant meeting Wheel bearing lubricant meeting
Bearings requirements of NLGI #2, Propshafts and requirements of NLGI #2,
Category GC or GC-LB Category GC or GC-LB
(Except Oil (GM Part No. U.S. 1051344, Splines (GM Part No. U.S. 1051344,
Filled Hubs) in Canada 993037). in Canada 993037).
SAE 75W-90 Synthetic Axle Cab — Door Multi-Purpose Lubricant, Superlube
Front Wheel
Bearings with Lubricant for Medium Duty Trucks Hinges and (GM Part No. U.S. 12346241,
Oil Filled Hubs (GM Part No. U.S. 89021675, in Latches in Canada 10953474).
Canada 10953512).
Weatherstrip Lubricant
SAE 75W-90 Synthetic Axle (GM Part No. U.S. 3634770,
Rear Axle and Lubricant for Medium Duty Trucks Weatherstrip in Canada 10953518) or
Rear Hubs (GM Part No. U.S. 89021675, in Conditioning Dielectric Silicone Grease
Canada 10953512). (GM Part No. U.S. 12345579,
in Canada 992887).
Refrigerant Oil
Rear Axle Shift (GM Part No. U.S. 5416939, Synthetic Grease with
Motor Lubricant in Canada 10953496). Weatherstrip Teflon, Superlube
Squeaks (GM Part No. U.S. 12371287,
in Canada 10953437).

322

Downloaded from www.Manualslib.com manuals search engine

 Part D: Maintenance Record
After the scheduled services are performed, record the date, odometer reading and who performed the
service, and any additional information from “Owner Checks and Services” on the following record pages.
Also, you should retain all maintenance receipts.

Miles/km Or Maintenance Record

Date Hours Serviced By

323

Downloaded from www.Manualslib.com manuals search engine

 Date Miles/km Or Serviced By Maintenance Record
Hours

324

Downloaded from www.Manualslib.com manuals search engine

 Date Miles/km Or Serviced By Maintenance Record
Hours

325

Downloaded from www.Manualslib.com manuals search engine

 Date Miles/km Or Serviced By Maintenance Record
Hours

326

Downloaded from www.Manualslib.com manuals search engine

 Section 7 Customer Assistance Information
Customer Assistance and Information ....... 328 Reporting Safety Defects to
Customer Satisfaction Procedure ............... 328 General Motors ...................................... 337
Customer Assistance for Service Publications Ordering
Text Telephone (TTY) Users .................. 330 Information ............................................. 338
Customer Assistance Offices ..................... 330 Vehicle Data Recording and Privacy ......... 339
GM Mobility Reimbursement Program ........ 331 Event Data Recorders ............................... 340
Roadside Assistance Program ................... 332 OnStar ...................................................... 341
Collision Damage Repair ........................... 332 Navigation System ..................................... 341
Reporting Safety Defects ............................ 336 Radio Frequency Identification (RFID) ........ 341
Reporting Safety Defects to the
United States Government ..................... 336
Reporting Safety Defects to the
Canadian Government ............................ 337

327

Downloaded from www.Manualslib.com manuals search engine

 Customer Assistance and STEP TWO: If after contacting a member of
dealership management, it appears your concern
Information cannot be resolved by the dealership without further
help, contact the GM Medium Duty Truck Customer
Customer Satisfaction Procedure Assistance Center at 1-800-862-4389. In Canada,
contact GM of Canada Customer Communication
Your satisfaction and goodwill are important Centre in Oshawa by calling 1-800-263-3777
to your dealer and to GMC. Normally, any (English) or 1-800-263-7854 (French).
concerns with the sales transaction or the
We encourage you to call the toll-free number in
operation of your vehicle will be resolved by
order to give your inquiry prompt attention. Please
your dealer’s sales or service departments.
have the following information available to give the
Sometimes, however, despite the best intentions
Customer Assistance Representative:
of all concerned, misunderstandings can occur.
If your concern has not been resolved to your • Vehicle Identification Number (VIN). This is
satisfaction, the following steps should be taken: available from the vehicle registration or title, or
the plate at the top left of the instrument panel
STEP ONE: Discuss your concern with a member and visible through the windshield.
of dealership management. Normally, concerns
can be quickly resolved at that level. If the matter
• Dealership name and location.
has already been reviewed with the sales, • Vehicle delivery date and present mileage
service or parts manager, contact the owner (kilometers).
of the dealership or the general manager. When contacting GMC please remember that
your concern will likely be resolved at a dealer’s
facility. That is why we suggest you follow
Step One first if you have a concern.

328

Downloaded from www.Manualslib.com manuals search engine

 STEP THREE: Both General Motors and your You may contact the BBB Auto Line Program
dealer are committed to making sure you are using the toll-free telephone number or write them
completely satisfied with your new vehicle. at the following address:
However, if you continue to remain unsatisfied BBB Auto Line Program
after following the procedure outlined in Steps One Council of Better Business Bureaus, Inc.
and Two, you should file with the BBB Auto Line 4200 Wilson Boulevard
Program to enforce any additional rights you Suite 800
may have. Canadian owners refer to your Arlington, VA 22203-1838
Warranty and Owner Assistance Information
Telephone: 1-800-955-5100
booklet for information on the Canadian Motor
Vehicle Arbitration Plan (CAMVAP). This program is available in all 50 states and
the District of Columbia. Eligibility is limited
The BBB Auto Line Program is an out of court by vehicle age, mileage, and other factors.
program administered by the Council of Better General Motors reserves the right to change
Business Bureaus to settle automotive disputes eligibility limitations and/or discontinue its
regarding vehicle repairs or the interpretation participation in this program.
of the New Vehicle Limited Warranty. Although you
may be required to resort to this informal dispute
resolution program prior to filing a court action,
use of the program is free of charge and your case
will generally be heard within 40 days. If you do
not agree with the decision given in your case, you
may reject it and proceed with any other venue
for relief available to you.

329

Downloaded from www.Manualslib.com manuals search engine

 Customer Assistance for www.GMC.com
Text Telephone (TTY) Users 1-800-862-4389
1-800-462-8583 (For Text Telephone
To assist customers who are deaf, hard of devices (TTYs))
hearing, or speech-impaired and who use the Fax Number: 313-381-0022
Text Telephones (TTYs), GMC has TTY equipment From Puerto Rico
available at its Customer Assistance Center. 1-800-496-9992 (English)
Any TTY user can communicate with GMC 1-800-496-9993 (Spanish)
by dialing: 1-800-GMC-8583 (462-8583). Fax Number: 313-381-0022
(TTY users in Canada can dial 1-800-263-3830.) U.S. Virgin Islands:
1-800-496-9994
Customer Assistance Offices Fax Number: 313-381-0022
GMC encourages customers to call the toll-free Canada – Customer Assistance
number for assistance. However, if a customer General Motors of Canada Limited
wishes to write or e-mail, refer to the addresses Customer Communication Centre, CA1-163-005
below. 1908 Colonel Sam Drive
United States – Customer Assistance Oshawa, Ontario L1H 8P7
1-800-263-3777 (English)
GM Medium Duty Truck Customer 1-800-263-7854 (French)
Assistance Center 1-800-263-3830 (For Text Telephone
Customer Assistance Center devices (TTYs)
P.O. Box 44947 Roadside Assistance: 1-800-268-6800
Detroit, MI 48244

330

Downloaded from www.Manualslib.com manuals search engine

 Overseas – Customer Assistance GM Mobility Reimbursement
Please contact the local General Motors Program
Business Unit.
Mexico, Central America and Caribbean
Islands/Countries (Except Puerto Rico
and U.S. Virgin Islands) – Customer
Assistance
General Motors de Mexico, S. de R.L. de C.V.
Customer Assistance Center This program, available to qualified applicants, can
Paseo de la Reforma # 2740 reimburse you up to $1,000 of the cost of eligible
Col. Lomas de Bezares aftermarket adaptive equipment required for
C.P. 11910, Mexico, D.F. your vehicle, such as hand controls or a
01-800-508-0000 wheelchair/scooter lift.
Long Distance: 011-52-53 29 0 800
The offer is available for a very limited period of
time from the date of vehicle purchase/lease.
For more details, or to determine your vehicle’s
eligibility, visit gmmobility.com or call the GM
Mobility Assistance Center at 1-800-323-9935.
Text telephone (TTY) users, call 1-800-833-9935.
GM of Canada also has a Mobility Program.
Call 1-800-GM-DRIVE (463-7483) for details.
TTY users call 1-800-263-3830.

331

Downloaded from www.Manualslib.com manuals search engine

 Roadside Assistance Program Collision Damage Repair
The Roadside Assistance program for GM Medium If your vehicle is involved in a collision and it is
Duty trucks provide stranded owners/operators damaged, have the damage repaired by a qualified
with towing service for disabled vehicles. technician using the proper equipment and quality
Roadside Assistance is available 24 hours a day, replacement parts. Poorly performed collision
7 days a week, 365 days a year. repairs diminish your vehicle’s resale value, and
safety performance can be compromised in
This service combines the efforts of trained subsequent collisions.
telephone representatives with a network of
GM Medium Duty truck dealer services. Collision Parts
Call GM Medium Duty Truck Roadside Genuine GM Collision parts are new parts
Assistance at 1-800-862-4389, in the U.S., and made with the same materials and construction
1-800-268-6800, in Canada, to reach a qualified methods as the parts with which your vehicle was
representative who can assist you in a repair originally built. Genuine GM Collision parts are
or arrange a tow. your best choice to assure that your vehicle’s
Other services can be arranged for situations designed appearance, durability, and safety are
such as retrieving locked in keys, changing a preserved. The use of Genuine GM parts can
tire, or delivering gasoline, at a charge to help maintain your GM New Vehicle Warranty.
the owner/operator. We also provide dealer Recycled original equipment parts may also be
information at no charge, such as location of used for repair. These parts are typically removed
the nearest authorized medium duty GM Medium from vehicles that were total losses in prior
Duty Truck dealer and their hours of operation. accidents. In most cases, the parts being recycled
are from undamaged sections of the vehicle.

332

Downloaded from www.Manualslib.com manuals search engine

 A recycled original equipment GM part, may be Insuring Your Vehicle
an acceptable choice to maintain your vehicle’s
originally designed appearance and safety Protect your investment in your GM vehicle with
performance, however, the history of these parts is comprehensive and collision insurance coverage.
not known. Such parts are not covered by your GM There are significant differences in the quality of
New Vehicle Limited Warranty, and any related coverage afforded by various insurance policy
failures are not covered by that warranty. terms. Many insurance policies provide reduced
protection to your GM vehicle by limiting
Aftermarket collision parts are also available. compensation for damage repairs by using
These are made by companies other than GM and aftermarket collision parts. Some insurance
may not have been tested for your vehicle. As a companies will not specify aftermarket collision
result, these parts may fit poorly, exhibit premature parts. When purchasing insurance, we recommend
durability/corrosion problems, and may not perform that you assure your vehicle will be repaired with
properly in subsequent collisions. Aftermarket parts GM original equipment collision parts. If such
are not covered by your GM New Vehicle Limited insurance coverage is not available from your
Warranty, and any vehicle failure related to such current insurance carrier, consider switching to
parts are not covered by that warranty. another insurance carrier.
Repair Facility If your vehicle is leased, the leasing company may
require you to have insurance that assures repairs
GM also recommends that you choose a collision
with Genuine GM Original Equipment Manufacturer
repair facility that meets your needs before you
(OEM) parts or Genuine Manufacturer replacement
ever need collision repairs. Your dealer/retailer
parts. Read your lease carefully, as you may be
may have a collision repair center with GM-trained
charged at the end of your lease for poor quality
technicians and state of the art equipment, or
repairs.
be able to recommend a collision repair center
that has GM-trained technicians and comparable
equipment.

333

Downloaded from www.Manualslib.com manuals search engine

 If an Accident Occurs • If you need roadside assistance, call
GM Roadside Assistance. See Roadside
Here is what to do if you are involved in an Assistance Program on page 332 for more
accident. information.
• Try to relax and then check to make sure you • If your vehicle cannot be driven, know where
are all right. If you are uninjured, make sure the towing service will be taking it. Get a
that no one else in your vehicle, or the card from the tow truck operator or write down
other vehicle, is injured. the driver’s name, the service’s name, and
• If there has been an injury, call 911 for help. the phone number.
Do not leave the scene of an accident until • Remove any valuables from your vehicle
all matters have been taken care of. Move before it is towed away. Make sure this
your vehicle only if its position puts you includes your insurance information and
in danger or you are instructed to move registration if you keep these items in your
it by a police officer. vehicle.
• Give only the necessary and requested • Gather the important information you will
information to police and other parties involved need from the other driver. Things like name,
in the accident. Do not discuss your personal address, phone number, driver’s license
condition, mental frame of mind, or anything number, vehicle license plate, vehicle make,
unrelated to the accident. This will help guard model and model year, Vehicle Identification
against post-accident legal action. Number (VIN), insurance company and
policy number, and a general description
of the damage to the other vehicle.

334

Downloaded from www.Manualslib.com manuals search engine

 • If possible, call your insurance company from Managing the Vehicle Damage Repair
the scene of the accident. They will walk you Process
through the information they will need. If they
ask for a police report, phone or go to the police In the event that your vehicle requires damage
department headquarters the next day and you repairs, GM recommends that you take an active
can get a copy of the report for a nominal fee. In role in its repair. If you have a pre-determined
some states/provinces with “no fault” insurance repair facility of choice, take your vehicle there,
laws, a report may not be necessary. This is or have it towed there. Specify to the facility that
especially true if there are no injuries and both any required replacement collision parts be original
vehicles are driveable. equipment parts, either new Genuine GM parts or
• Choose a reputable collision repair facility for recycled original GM parts. Remember, recycled
parts will not be covered by your GM vehicle
your vehicle. Whether you select a dealer/
warranty.
retailer or a private collision repair facility to fix
the damage, make sure you are comfortable Insurance pays the bill for the repair, but you must
with them. Remember, you will have to feel live with the repair. Depending on your policy limits,
comfortable with their work for a long time. your insurance company may initially value the
• Once you have an estimate, read it carefully repair using aftermarket parts. Discuss this with
and make sure you understand what work will your repair professional, and insist on Genuine GM
be performed on your vehicle. If you have a parts. Remember if your vehicle is leased you may
question, ask for an explanation. Reputable be obligated to have the vehicle repaired with
shops welcome this opportunity. Genuine GM parts, even if your insurance
coverage does not pay the full cost.

335

Downloaded from www.Manualslib.com manuals search engine

 If another party’s insurance company is paying If NHTSA receives similar complaints, it may open
for the repairs, you are not obligated to accept an investigation. If it finds that a safety defect exists
a repair valuation based on that insurance in a group of vehicles, it may order a recall and
company’s collision policy repair limits, as you remedy campaign. However, NHTSA cannot
have no contractual limits with that company. become involved in individual problems between
In such cases, you can have control of the repair you, your dealer/retailer, or General Motors.
and parts choices as long as cost stays within To contact NHTSA, call the Vehicle Safety Hotline
reasonable limits. toll-free at 1-888-327-4236 (TTY: 1-800-424-9153);
go to http://www.safercar.gov; or write to:
Reporting Safety Defects Administrator, NHTSA
400 Seventh Street, SW.
Reporting Safety Defects to the Washington, D.C. 20590
United States Government You can obtain information about motor vehicle
safety from http://www.safercar.gov.
If you believe that your vehicle has a defect which
could cause a crash or could cause injury or
death, inform the National Highway Traffic Safety
Administration (NHTSA) immediately, in addition
to notifying General Motors.

336

Downloaded from www.Manualslib.com manuals search engine

 Reporting Safety Defects to the Reporting Safety Defects to
Canadian Government General Motors
If you live in Canada, and you believe that your In addition to notifying NHTSA (or Transport
vehicle has a safety defect, notify Transport Canada) in a situation like this, we certainly hope
Canada immediately, in addition to notifying you’ll notify us. Please call us at 1-800-862-4389,
General Motors of Canada Limited. Call them or write:
at 1-800-333-0510 or write to: GM Medium Duty Truck
Transport Canada Customer Assistance Center
Road Safety Branch P.O. Box 44947
2780 Sheffield Road Detroit, MI 48244
Ottawa, Ontario K1B 3V9 In Canada, please call us at 1-800-263-3777
(English) or 1-800-263-7854 (French). Or, write:
General Motors of Canada Limited
Customer Communication Centre, CA1-163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7

337

Downloaded from www.Manualslib.com manuals search engine

 Service Publications Ordering Owner Information
Information Owner publications are written specifically for
owners and intended to provide basic operational
Service Manuals information about the vehicle. The owner’s manual
Service Manuals have the diagnosis and repair will include the Maintenance Schedule for all
information on engines, transmission, axle models.
suspension, brakes, electrical, steering, body, etc. In-Portfolio: Includes a Portfolio, Owner Manual,
and Warranty Booklet.
Service Bulletins
RETAIL SELL PRICE: $35.00
Service Bulletins’ give additional technical service
information needed to knowledgeably service Without Portfolio: Owner Manual only.
GM cars and trucks. Each bulletin contains RETAIL SELL PRICE: $25.00
instructions to assist in the diagnosis and
service of your vehicle. Current and Past Model Order Forms
Technical Service Bulletins and Manuals are
available for current and past model GM vehicles.
To request an order form, please specify year
and model name of the vehicle.

338

Downloaded from www.Manualslib.com manuals search engine

 ORDER TOLL FREE: 1-800-551-4123 Vehicle Data Recording and
Monday-Friday 8:00 AM - 6:00 PM
Eastern Time Privacy
For Credit Card Orders Only Your GM vehicle has a number of sophisticated
(VISA-MasterCard-Discover), visit Helm, Inc. at: computers that record information about the
www.helminc.com vehicle’s performance and how it is driven.
For example, your vehicle uses computer modules
Or you can write to: to monitor and control engine and transmission
Helm, Incorporated performance, to monitor the conditions for airbag
P.O. Box 07130 deployment and deploy airbags in a crash and, if
Detroit, MI 48207 so equipped, to provide anti-lock braking to help the
Prices are subject to change without notice and driver control the vehicle. These modules may store
without incurring obligation. Allow ample time data to help your dealer/retailer technician service
for delivery. your vehicle. Some modules may also store data
about how you operate the vehicle, such as rate
Note to Canadian Customers: All listed prices are of fuel consumption or average speed. These
quoted in U.S. funds. Canadian residents are modules may also retain the owner’s personal
to make checks payable in U.S. funds. preferences, such as radio pre-sets, seat positions,
and temperature settings.

339

Downloaded from www.Manualslib.com manuals search engine

 Event Data Recorders conditions and no personal data (e.g., name,
gender, age, and crash location) is recorded.
This vehicle has an Event Data Recorder (EDR). However, other parties, such as law enforcement,
The main purpose of an EDR is to record, in could combine the EDR data with the type of
certain crash or near crash-like situations, such as personally identifying data routinely acquired
an air bag deployment or hitting a road obstacle, during a crash investigation.
data that will assist in understanding how a
To read data recorded by an EDR, special
vehicle’s systems performed. The EDR is designed
equipment is required, and access to the vehicle
to record data related to vehicle dynamics and
or the EDR is needed. In addition to the vehicle
safety systems for a short period of time, typically
manufacturer, other parties, such as law
30 seconds or less. The EDR in this vehicle is
enforcement, that have the special equipment,
designed to record such data as:
can read the information if they have access
• How various systems in your vehicle were to the vehicle or the EDR.
operating
GM will not access this data or share it with others
• Whether or not the driver and passenger except: with the consent of the vehicle owner or, if
safety belts were buckled/fastened the vehicle is leased, with the consent of the lessee;
• How far, if at all, the driver was pressing the in response to an official request of police or similar
accelerator and/or brake pedal government office; as part of GM’s defense of
• How fast the vehicle was traveling litigation through the discovery process; or, as
required by law. Data that GM collects or receives
This data can help provide a better understanding may also be used for GM research needs or may
of the circumstances in which crashes and be made available to others for research purposes,
injuries occur. where a need is shown and the data is not tied to a
Important: EDR data is recorded by your vehicle specific vehicle or vehicle owner.
only if a non-trivial crash situation occurs; no
data is recorded by the EDR under normal driving

340

Downloaded from www.Manualslib.com manuals search engine

 OnStar Radio Frequency
If your vehicle has OnStar® and you subscribe to Identification (RFID)
the OnStar® services, please refer to the OnStar® RFID technology is used in some vehicles
Terms and Conditions for information on data
for functions such as tire pressure monitoring and
collection and use.
ignition system security, as well as in connection
with conveniences such as key fobs for remote
Navigation System door locking/unlocking and starting, and in-vehicle
transmitters for garage door openers. RFID
If your vehicle has a navigation system,
technology in GM vehicles does not use or record
use of the system may result in the storage of
personal information or link with any other GM
destinations, addresses, telephone numbers,
system containing personal information.
and other trip information. Please refer to
the navigation system operating manual for
information on stored data and for deletion
instructions.

341

Downloaded from www.Manualslib.com manuals search engine

 ✍ NOTES

342

Downloaded from www.Manualslib.com manuals search engine

 A Appearance Care (cont.)
Sheet Metal Damage ............................... 273
Accessories and Modifications ..................... 191 Tires ........................................................ 273
Add-On Electrical Equipment ....................... 276 Underbody Maintenance ........................... 273
Air Cleaner/Filter, Engine ............................. 211 Vehicle Care/Appearance Materials .......... 274
Air Conditioning ........................................... 114 Washing Your Vehicle .............................. 270
Air Pressure Gage ...................................... 136 Weatherstrips ........................................... 270
Air Suspension .............................................. 85 Windshield and Wiper Blades ................... 272
Air Suspension Seats .................................... 26 Ashtray ....................................................... 114
AM-FM Radio .............................................. 139 Audio System .............................................. 137
Antenna, Fixed Mast ................................... 146 AM-FM Radio .......................................... 139
Antilock Brake System (ABS) ...................... 154 Care of Your Cassette Tape Player .......... 146
Antilock Brake, System Warning Light ......... 127 Fixed Mast Antenna ................................. 146
Antilock Brakes, Trailer System Radio with Cassette ................................. 142
Warning Light ........................................... 127 Setting the Time ...................................... 138
Appearance Care Understanding Radio Reception ............... 145
Aluminum Wheels .................................... 272 Automatic Transmission
Care of Safety Belts ................................ 270 Fluid ........................................................ 213
Chemical Paint Spotting ........................... 274 Operation ................................................... 76
Cleaning Exterior Lamps/Lenses .............. 271 Third-Gear Hold ......................................... 77
Cleaning the Inside of Your Vehicle .......... 267 Auxiliary Power Jacks ................................. 113
Fabric/Carpet ........................................... 268 Axle, Two-Speed Rear Axle Electric
Finish Care .............................................. 271 Shift Control ............................................... 75
Finish Damage ......................................... 273
Instrument Panel, Vinyl, and Other
Plastic Surfaces .................................... 269

343

Downloaded from www.Manualslib.com manuals search engine

 B C
Battery ........................................................ 235 Cab Tilting
Brake Before You Tilt the Cab ............................ 242
Diesel Engine Exhaust ............................... 74 Lifting the Front Panel ............................. 247
Emergencies ............................................ 156 Lowering the Cab .................................... 245
Exhaust Indicator Light ............................. 133 Tilting the Cab ......................................... 243
Trailer Hand Control Valve ....................... 156 California Proposition 65 Warning ................ 192
Brakes ........................................................ 227 Canadian Owners ........................................... 3
Hydraulic Systems ................................... 153 Capacities and Specifications ...................... 285
Parking Brake Burnish Procedure .............. 85 Carbon Monoxide .......................................... 86
System Warning Light .............................. 124 Care of
Braking ....................................................... 152 Safety Belts ............................................. 270
Braking in Emergencies ............................... 156 Your Cassette Tape Player ....................... 146
Break-In, New Vehicle ................................... 65 Center Console Storage Area ........................ 95
Bulb Replacement ....................................... 250 Center Passenger Position, Safety Belts ........ 42

344

Downloaded from www.Manualslib.com manuals search engine

 Center Seat .................................................. 27 Cleaning (cont.)
Charging System Light ................................ 122 Tires ........................................................ 273
Check Underbody Maintenance ........................... 273
Engine Light ............................................ 130 Washing Your Vehicle .............................. 270
Gages Warning Light ............................... 134 Weatherstrips ........................................... 270
Chemical Paint Spotting .............................. 274 Windshield and Wiper Blades ................... 272
Child Restraints Climate Control System ............................... 114
Child Restraint Systems ............................. 50 Air Filter, Passenger Compartment ........... 116
Infants and Young Children ........................ 46 Outlet Adjustment ..................................... 116
Lower Anchors and Tethers for Children ..... 54 Clock .......................................................... 138
Older Children ........................................... 43 Clutch, Hydraulic ......................................... 215
Securing a Child Restraint in Your Collision Damage Repair ............................. 332
Medium Duty Vehicle .............................. 55 Control of a Vehicle ..................................... 152
Cigarette Lighter .......................................... 114 Coolant
Cleaning Engine Temperature Gage ........................ 128
Aluminum Wheels .................................... 272 Heater, Engine ........................................... 73
Exterior Lamps/Lenses ............................. 271 Low Warning Light ................................... 129
Fabric/Carpet ........................................... 268 Surge Tank Pressure Cap ........................ 219
Finish Care .............................................. 271 Cooling System ........................................... 221
Inside of Your Vehicle .............................. 267 Cruise Control ............................................. 107
Instrument Panel, Vinyl, and Other
Plastic Surfaces .................................... 269

345

Downloaded from www.Manualslib.com manuals search engine

 Customer Assistance Information Diesel Engine (cont.)
Customer Assistance for High Idle System ....................................... 70
Text Telephone (TTY) Users ................. 330 Starting ...................................................... 66
Customer Assistance Offices .................... 330 Diesel Particulate Filter ................................. 87
Customer Satisfaction Procedure .............. 328 Diesel Particulate Filter Warning Light ......... 136
GM Mobility Reimbursement Program ...... 331 Differential Lock Control, Rear Axle ............. 157
Reporting Safety Defects to Differential Lock Indicator Light .................... 133
General Motors ..................................... 337 Doing Your Own Service Work .................... 193
Reporting Safety Defects to the Dome Lamps ............................................... 112
Canadian Government .......................... 337 Door
Reporting Safety Defects to the Locks ......................................................... 61
United States Government .................... 336 Driver
Roadside Assistance Program .................. 332 Position, Safety Belt ................................... 33
Service Publications Ordering Driving
Information ........................................... 338 At Night ................................................... 165
City .......................................................... 169
Defensive ................................................. 148
D Drunken ................................................... 149
Daytime Running Lamps ............................. 111 Freeway ................................................... 170
Daytime Running Lamps Indicator Light ....... 134 Hill and Mountain Roads .......................... 172
Defensive Driving ........................................ 148 In Rain and on Wet Roads ...................... 166
Diesel Engine ................................................ 74 Rocking Your Vehicle to Get it Out .......... 179
Engine Alarm and Automatic Shutdown ...... 69 Tow Hooks ............................................... 179
Exhaust Restrictor ...................................... 70 Winter ...................................................... 174
Fuel ......................................................... 195 Dual Tire Operation ..................................... 256

346

Downloaded from www.Manualslib.com manuals search engine

 E Engine (cont.)
Coolant Heater .......................................... 73
EDR ............................................................ 339 Coolant Temperature Gage ...................... 128
Electrical System Diesel Engine Exhaust Brake ..................... 74
Add-On Equipment ................................... 276 Drive Belt Routing .................................... 289
Fuses and Circuit Breakers ...................... 277 Exhaust ..................................................... 86
Fusible Links ............................................ 276 Exhaust Restrictor ...................................... 70
Headlamp Wiring ..................................... 276 Fan Breakage .......................................... 194
Instrument Panel Fuse Block ................... 277 High Idle System ....................................... 70
Maxi-Fuse Block ...................................... 281 Oil ........................................................... 206
Power Windows and Other Oil Life System ........................................ 209
Power Options ...................................... 277 Overheating ............................................. 219
Relay Center ............................................ 282 Overspeed Warning Light ......................... 132
Windshield Wiper Fuses ........................... 276 Reduced Power Light ............................... 133
Emission Control Systems Warranty ................ 3 Running While Parked ............................... 92
Engine Shutdown Warning Light .......................... 132
Air Cleaner/Filter ...................................... 211 Speed Limiter .......................................... 121
Alarm and Automatic Shutdown ................. 69 Starting Your Diesel ................................... 66
Change Engine Oil Light .......................... 132 Event Data Recorders ................................. 340
Check and Service Engine Soon Light ..... 130 Exhaust Brake Indicator Light ...................... 133
Checks Before Operating ........................... 71 Exhaust Restrictor ......................................... 70
Coolant .................................................... 216 Extender, Safety Belt ..................................... 43

347

Downloaded from www.Manualslib.com manuals search engine

 F Fuel (cont.)
Water in Fuel ........................................... 198
Filter Water in Warning Light ............................ 135
Engine Air Cleaner ................................... 211 What Fuel to Use .................................... 195
Finish Damage ............................................ 273 Fuses
Fixed Mast Antenna .................................... 146 Fuses and Circuit Breakers ...................... 277
Flashers, Hazard Warning ........................... 102 Instrument Panel Fuse Block ................... 277
Flash-to-Pass .............................................. 105 Maxi-Fuse Block ...................................... 281
Flat Tire ...................................................... 265 Relay Center ............................................ 282
Fluid Windshield Wiper ..................................... 276
Automatic Transmission ............................ 213
Manual Transmission ................................ 214
Power Steering ........................................
Windshield Washer ..................................
225
226
G
Gage
Front Wheel Bearings with Oil-Filled Hubs .... 253 Air Pressure ............................................. 136
Fuel Check Gages Warning Light ..................... 134
Diesel Engine Fuel ................................... 195 Engine Coolant Temperature .................... 128
Filling a Portable Fuel Container .............. 205 Fuel ......................................................... 135
Filling Your Tank ...................................... 204 Hourmeter ................................................ 137
Filter ........................................................ 251 Oil Pressure ............................................. 130
Gage ....................................................... 135 Speedometer ........................................... 120
Primary Filter and Water Separator .......... 252 Tachometer .............................................. 120
Running Out of Fuel ................................ 203 Voltmeter Gage ........................................ 122
Very Cold Weather Operation ................... 198 GM Mobility Reimbursement Program .......... 331

348

Downloaded from www.Manualslib.com manuals search engine

 H I
Hazard Warning Flashers ............................ 102 Ignition Positions ........................................... 66
Headlamp Wiring ......................................... 276 Infants and Young Children, Restraints .......... 46
Headlamps .................................................. 110 Inflation - Tire Pressure ............................... 255
Bulb Replacement .................................... 250 Instrument Panel
Daytime Running Lamps .......................... 111 Overview .................................................. 100
Flash-to-Pass ........................................... 105 Instrument Panel (I/P)
High/Low Beam Changer ......................... 104 Brightness ................................................ 112
On Reminder ........................................... 111 Cluster ..................................................... 119
Heater ......................................................... 114
High Idle System ........................................... 70
Highbeam On Light ..................................... 134 J
Highway Hypnosis ....................................... 172 Jacks, Auxiliary Power ................................. 113
Hill and Mountain Roads ............................. 172 Jump Starting .............................................. 236
Horn ............................................................ 102
Hourmeter Gage .......................................... 137
How to Use This Manual ............................... 17 K
How to Wear Safety Belts Properly ............... 32 Keys ............................................................. 60
Hydraulic Clutch .......................................... 215

349

Downloaded from www.Manualslib.com manuals search engine

 L Light (cont.)
Malfunction Indicator ................................ 130
Lamps Range Inhibit Warning Indicator ................ 124
Dome ....................................................... 112 Reduced Engine Power ............................ 133
Marker ..................................................... 112 Safety Belt Reminder ............................... 121
Rear Reading .......................................... 113 Safety Belt Reminder Tone ...................... 121
LATCH System Service Transmission Warning .................. 123
Child Restraints ......................................... 54 Traction Control System Active ................. 128
Light Trailer Antilock Brake System Warning ..... 127
Antilock Brake System Warning ................ 127 Wait to Start Indicator .............................. 129
Brake System Warning ............................. 124 Water in Fuel Warning ............................. 135
Change Engine Oil ................................... 132 Lights .......................................................... 110
Charging System ..................................... 122 Flash-to-Pass ........................................... 105
Check Gages Warning ............................. 134 High/Low Beam Changer ......................... 104
Daytime Running Lamps Indicator ............ 134 On Reminder ........................................... 111
Diesel Particulate Filter Warning ............... 136 Loading Your Vehicle ................................... 180
Differential Lock Indicator ......................... 133 Locks
Engine Overspeed Warning ...................... 132 Door .......................................................... 61
Engine Shutdown Warning ....................... 132 Loss of Control ........................................... 163
Exhaust Brake Indicator ........................... 133 Low Coolant Warning Light .......................... 129
Highbeam On .......................................... 134 Lumbar
Low Coolant Warning ............................... 129 Manual Controls ......................................... 23
Low Oil Level ........................................... 131

350

Downloaded from www.Manualslib.com manuals search engine

 M Malfunction Indicator Light ........................... 130
Manual Lumbar Controls ............................... 23
Maintenance, Normal Replacement Parts .... 288 Manual Seats ................................................ 22
Maintenance Schedule Manual Transmission
At Each Fuel Fill ...................................... 315 Fluid ........................................................ 214
At Least Once a Year .............................. 320 Operation ................................................... 77
At Least Twice a Year .............................. 316 Marker Lamps ............................................. 112
How This Section is Organized ................ 293 Mirrors
Introduction .............................................. 292 Outside Convex Mirrors ............................. 93
Maintenance Requirements ...................... 292 Outside Heated Mirrors .............................. 94
Part A - Scheduled Maintenance Outside Manual Mirrors .............................. 93
Services ............................................... 294
Part B - Owner Checks and Services ...... 315
Part C - Recommended Fluids and
Lubricants ............................................. 321
N
Navigation System, Privacy ......................... 341
Part D - Maintenance Record .................. 323 New Vehicle Break-In .................................... 65
Scheduled Maintenance ........................... 295 Noise Control System, Tampering ................ 248
Scheduled Maintenance Supplements ...... 295 Normal Maintenance Replacement Parts ..... 288
Using ....................................................... 294
Your Vehicle and the Environment ............ 292

351

Downloaded from www.Manualslib.com manuals search engine

 O P
Odometer .................................................... 120 Paint, Damage ............................................ 273
Odometer, Trip ............................................ 120 Park Brake ............................................. 81, 82
Off-Road Recovery ...................................... 161 Parking ......................................................... 80
Oil Brake Burnish Procedure ........................... 85
Change Engine Oil Light .......................... 132 Over Things That Burn .............................. 86
Engine ..................................................... 206 Part A - Scheduled Maintenance Services .... 294
Low Oil Level Light .................................. 131 Part B - Owner Checks and Services .......... 315
Pressure Gage ......................................... 130 Part C - Recommended Fluids and
Oil, Engine Oil Life System ......................... 209 Lubricants ................................................ 321
Older Children, Restraints ............................. 43 Part D - Maintenance Record ...................... 323
OnStar, Privacy ........................................... 341 Passenger Compartment Air Filter ............... 116
Other Service Items Passenger Position, Safety Belts ................... 41
Front Wheel Bearings with Passing ....................................................... 161
Oil-Filled Hubs ...................................... 253 Power
Fuel Filter ................................................ 251 Auxiliary Jacks ......................................... 113
Primary Fuel Filter and Water Separator ... 252 Electrical System ..................................... 277
Other Warning Devices ................................ 102 Reduced Engine Light .............................. 133
Outlet Adjustment ........................................ 116 Steering Fluid .......................................... 225
Outside Windows .................................................... 63
Convex Mirrors .......................................... 93 Power Take-Off (PTO) ................................... 79
Heated Mirrors ........................................... 94 Privacy ........................................................ 339
Manual Mirrors ........................................... 93 Event Data Recorders .............................. 340
Overspeed Warning Light ............................ 132 Navigation System ................................... 341
OnStar ..................................................... 341
Owners, Canadian .......................................... 3 Radio Frequency Identification .................. 341

352

Downloaded from www.Manualslib.com manuals search engine

 Q Rear Reading Lamps .................................. 113
Reclining Seatbacks ...................................... 24
Questions and Answers About Safety Belts .... 32 Reduced Engine Power Light ...................... 133
Reporting Safety Defects
Canadian Government ............................. 337
R General Motors ........................................ 337
Radio Frequency Identification (RFID), United States Government ....................... 336
Privacy ..................................................... 341 Restraint System Check
Radios ........................................................ 137 Checking the Restraint Systems ................. 56
AM-FM Radio .......................................... 139 Replacing Restraint System Parts
Care of Your Cassette Tape Player .......... 146 After a Crash ......................................... 57
Radio with Cassette ................................. 142 Roadside
Setting the Time ...................................... 138 Assistance Program ................................. 332
Understanding Reception ......................... 145 Rocking Your Vehicle to Get it Out .............. 179
Range Inhibit Warning Indicator ................... 124 Routing, Engine Drive Belt .......................... 289
Rear Axle .................................................... 241 Running Out of Fuel .................................... 203
Differential Lock Control ........................... 157 Running the Engine While Parked ................. 92
Shift Motor ............................................... 242
Two-Speed Electric Shift Control ................ 75

353

Downloaded from www.Manualslib.com manuals search engine

 S Securing a Child Restraint
Medium Duty Vehicle ................................. 55
Safety Belt Service ........................................................ 191
Reminder Light ........................................ 121 Accessories and Modifications .................. 191
Reminder Tone ........................................ 121 California Proposition 65 Warning ............. 192
Safety Belts Doing Your Own Work ............................. 193
Care of .................................................... 270 Engine Fan Breakage .............................. 194
Center Passenger Position ......................... 42 Engine Soon Light ................................... 130
Driver Position ........................................... 33 Publications Ordering Information ............. 338
How to Wear Safety Belts Properly ............ 32 Transmission Warning Light ..................... 123
Questions and Answers About Sheet Metal Damage ................................... 273
Safety Belts ............................................ 32 Shoulder Belt Height Adjuster ........................ 40
Right Passenger Position ........................... 41 Side Door Glass ........................................... 64
Safety Belt Extender .................................. 43 Signals, Turn and Lane-Change .................. 104
Safety Belt Use During Pregnancy ............. 41 Specifications, Capacities ............................ 285
Safety Belts Are for Everyone .................... 28 Speedometer ............................................... 120
Shoulder Belt Height Adjuster .................... 40 Starting Your Diesel Engine ........................... 66
Safety Warnings and Symbols ....................... 17 Steering ...................................................... 159
Scheduled Maintenance ............................... 295 Steering Wheel, Tilt Wheel .......................... 102
Scheduled Maintenance Supplements .......... 295 Storage Areas ............................................... 94
Seats Center Console Storage Area .................... 95
Air Suspension Seats ................................. 26 Stuck in Sand, Mud, Ice, or Snow ............... 178
Center Seat ............................................... 27 Suspension, Air ............................................. 85
Manual Lumbar .......................................... 23
Reclining Seatbacks ................................... 24

354

Downloaded from www.Manualslib.com manuals search engine

 T Traction
Control System Active Light ..................... 128
Tachometer ................................................. 120 Control System (TCS) .............................. 157
TCS Active Light ......................................... 128 Trailer
Tilt Wheel .................................................... 102 Connections ............................................. 187
Time, Setting ............................................... 138 Trailer Brake Hand Control Valve ................ 156
Tires ........................................................... 254 Transmission
Aluminum Wheels, Cleaning ..................... 272 Fluid, Automatic ....................................... 213
Cleaning .................................................. 273 Fluid, Manual ........................................... 214
Different Size ........................................... 258 Service Warning Light .............................. 123
Dual Tire Operation .................................. 256 Transmission Operation, Automatic ................ 76
If a Tire Goes Flat ................................... 265 Transmission Operation, Manual .................... 77
Inflation - Tire Pressure ............................ 255 Trip Odometer ............................................. 120
Tightening the Wheel Nuts ....................... 259 Turn and Lane-Change Signals ................... 104
Wheel Alignment and Tire Balance ........... 259 Turn Signal/Multifunction Lever .................... 103
Wheel Loading ......................................... 256 Two-Speed Rear Axle Electric Shift Control ..... 75
Wheel Replacement ................................. 263
When It Is Time for New Tires ................. 257
Tow Hooks ..................................................
Towing
179 U
Understanding Radio Reception ................... 145
Your Vehicle ............................................. 182

355

Downloaded from www.Manualslib.com manuals search engine

 V Water in Fuel Warning Light ........................ 135
What Fuel to Use ........................................ 195
Vehicle Wheels
Control ..................................................... 152 Alignment and Tire Balance ..................... 259
Damage Warnings ..................................... 18 Different Size ........................................... 258
Loading .................................................... 180 Front Bearings with Oil-Filled Hubs .......... 253
Symbols ..................................................... 18 Loading .................................................... 256
Vehicle Data Recording and Privacy ............ 339 Replacement ............................................ 263
Vehicle Identification Tightening the Wheel Nuts ....................... 259
Number (VIN) .......................................... 275 Windows ....................................................... 62
Ventilation Adjustment .................................. 116 Passenger Side Door Glass ....................... 64
Voltmeter Gage ........................................... 122 Power ........................................................ 63
Windshield
Washer .................................................... 106
W Washer Fluid ........................................... 226
Wait to Start Indicator ................................. 129 Wiper Blade Replacement ........................ 250
Warning Lights, Gages and Indicators ......... 118 Wiper Blades, Cleaning ............................ 272
Warnings Wiper Fuses ............................................ 276
Hazard Warning Flashers ......................... 102 Wipers ..................................................... 105
Other Warning Devices ............................ 102 Winter Driving ............................................. 174
Safety and Symbols ................................... 17
Vehicle Damage ......................................... 18
Warranty, Emission Control Systems ............... 3 Y
Water Your Vehicle and the Environment ............... 292
Fuel ......................................................... 198

356

Downloaded from www.Manualslib.com manuals search engine