AC–10
AIR CONDITIONING SYSTEM – Troubleshooting
SPECIAL TOOLS AND EQUIPMENT
Tool SST No. Use
Ohmmeter To diagnosis electrical system
Voltage meter To diagnosis electrical system
Air conditioning service tool set 07110–58011 To evacuate and charge system
Magnetic clutch remover 07112–66040 To remove pressure plate
Magnetic clutch stopper 07112–76060 To remove and install pressure plate
Snap ring pliers 07114–84020 To remove pressure plate
SSM (SPECIAL SERVICE MATERIALS)
Part Name Part No. Use etc.
ND OIL6, 07117–68040
Compressor
SUNISO No.5GS or equivalent
TROUBLESHOOTING
Problem Possible cause Remedy Page
No cooling or warm Magnetic clutch does not engage
air (a) A/C fuse blown Replace fuse and check for AC–6
short AC–17
(b) Magnetic clutch faulty Check magnetic clutch AC–29
(c) A/C switch faulty Check switch AC–31
(d) A/C amplifier faulty Check amplifier AC–6
(e) Wiring or ground faulty Repair as necessary AC–16
(f) Refrigerant empty Check refrigerant volume AC–37
(g) Heater relay faulty Check heater relay AC–29
(h) Pressure switch faulty Check pressure switch
Compressor does not rotate properly
(a) Drive belt loose or broken Adjust or replace drive belt AC–15
(b) Compressor faulty Check compressor AC–17
Expansion valve faulty Check expansion valve AC–25
Leak in system Test system for leaks
Fusible plug on receiver blown or clogged Check receiver AC–23
screen
Blower does not operate
(a) HEATER fuse blown Replace fuse and check for AC–6
short AC–29
(b) A/C switch faulty Check switch AC–37
(c) Heater relay faulty Check heater relay AC–37
(d) Blower motor faulty Check blower motor AC–6
(e) Wiring or ground faulty Repair as necessary
Cool air comes out Magnetic clutch slipping Check magnetic clutch AC–17
intermittently Expansion valve faulty Check expansion valve AC–25
Wiring connection faulty Repair as necessary AC–6
Excessive moisture in system Evacuate and charge system
A/C amplifier faulty Check amplifier AC–31
AC–11
AIR CONDITIONING SYSTEM – Troubleshooting
TROUBLESHOOTING (Cont’d)
Problem Possible cause Remedy Page
Cool air comes out Condenser clogged Check condenser AC–24
only at high speed Drive belt slipping Check or replace drive belt AC–15
Compressor faulty Check compressor AC–17
Insufficient or too much refrigerant Check refrigerant volume AC–16
Air in system Evacuate and charge system
Insufficient cooling Condenser clogged Check condenser AC–24
Drive belt slipping Check or replace drive belt AC–15
Magnetic clutch faulty Check magnetic clutch AC–17
Compressor faulty Check compressor AC–17
Expansion valve faulty Check expansion valve AC–25
Insufficient *or too much refrigerant Check refrigerant volume AC–16
Air or excessive compressor oil in system Evacuate and charge system
Receiver clogged Check receiver AC–23
Water valve cable faulty Reset water valve cable AC–36
A/C amplifier faulty Check amplifier AC–31
Insufficient velocity Evaporator clogged or frosted Clean evaporator fins or filters AC–27
of cool air Air leakage from cooling unit or air duct Repair as necessary
Air inlet blocked Repair as necessary
Blower motor faulty Check blower motor AC–37
A/C amplifier faulty Check amplifier AC–31
