Bulletin No.

: 21-NA-248
Service Bulletin Date: November, 2021

TECHNICAL
Subject: A/C Blows Warm Intermittently and/or Takes a Long Time to Start Cooling

This Bulletin takes place of PIT5834G. Please discard PIT5834G.

Model Year: VIN: Engine: Transmission:

Brand: Model:
from to from to
Blazer, 11th VIN
2021 MS500041 MS505210 All All
Digit=S
Equinox, 11th VIN
2020 LS716628 LS737551 All All
Digit=S
Chevrolet
Equinox, 11th VIN
2021 ML302631 ML337271 All All
Digit=L
Equinox, 11th VIN
2021 MS100011 MS100017 All All
Digit=S
Terrain, 11th VIN
GMC ML310942 ML337223 All All
Digit=L

Involved Region or Country United States, Canada

Some customers may comment on the A/C blows warm air intermittently and/or takes a
Condition
long time to cool.
Cause This condition may be caused by contamination in the A/C refrigerant.
If you duplicate this condition and the vehicle VIN is included in the above list, recover the
Correction
refrigerant using the GE-50957 Contaminated Refrigerant Recovery Machine.

Repair direction is based on review and is provided If it is clean or there is just oil and/or dye present (see
below determined by the 11th VIN digit. Reference the examples below) you will need to replace everything
11th VIN digit to determine the assembly plant the EXCEPT the evaporator.
vehicle came from. If you have any questions, contact TAC for assistance.
Note: If the truck was built outside the noted VIN You may need to provide pictures of these points for
breaks or if PIE0630 is not included in Service review.
Information section of VIS , perform the regular Run the performance tests in eSi and verify system
published A/C diagnosis in eSI. functioning as designed before releasing vehicle.
Remove the inlet and outlet lines from the compressor, 2021 Equinox or Terrain built at the SLP plant
the compressor solenoid and the lines to the TXV.
(11th VIN Digit = L)
2020/21 Equinox or 2021 Blazer built at the
Verify contamination present on compressor solenoid.
Ramos plant. (11th VIN Digit = S) (see examples below) Inspect the compressor inlet/
Inspect the lines and ports at the points opened up, outlet lines and port and also the TXV.
verify contamination present on compressor solenoid. If there is solid contamination in the TXV, you will need
(see examples below.) Inspect the picture of the TXV . to replace the entire system. Oil and/or dye present is
If there is solid contamination in the TXV you will need normal. (See examples below.)
to replace the entire A/C system.

Copyright 2021 General Motors LLC. All Rights Reserved.

Page 2 November, 2021 Bulletin No.: 21-NA-248

If there is solid contamination in the compressor inlet/

outlet you will need to replace everything EXCEPT the
evaporator.
If there is solid contamination on just the compressor
solenoid you will need to replace just the compressor
and receiver/dryer. Note that it is not necessary to
replace the condenser, the receiver/dryer is
replaceable separately.
If you have any questions, contact TAC for assistance.
You may need to provide pictures of these points for
review.
Run the performance tests in eSi and verify system
functioning as designed before releasing vehicle.

5899621

Shown in the picture above is a clean Compressor

Inlet/Outlet (Some oil and greenish dye is normal)

5787215

Shown in the picture above is a contaminated

Compressor Solenoid.

5899622

Shown in the picture above is a clean TXV (Some oil

and greenish dye is normal)
Bulletin No.: 21-NA-248 November, 2021 Page 3

Parts Information
Replace the components with the P/N’s outlined in the
Electronic Parts Catalog (EPC) in accordance with the
vehicle VIN.
Warranty Information
Use published Labor Operations for the parts that are
replaced.

Version 1
Modified Released November 05, 2021

Additional Keywords: AC air conditioning HVAC

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper WE SUPPORT VOLUNTARY
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your TECHNICIAN
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the CERTIFICATION
information.