A/C Blows Warm Intermittently and/or Takes a Long Time to Start Cooling – 2020-2021 Chevrolet GMC

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    Copyright 2021 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 21-NA-248 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. Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Blazer, 11th VIN Digit=S 2021 2021 MS500041 MS505210 All All Equinox, 11th VIN Digit=S 2020 LS716628 LS737551 All All Equinox, 11th VIN Digit=L 2021 ML302631 ML337271 All All Equinox, 11th VIN Digit=S MS100011 MS100017 All All GMC Terrain, 11th VIN Digit=L ML310942 ML337223 All All Involved Region or Country United States, Canada Condition Some customers may comment on the A/C blows warm air intermittently and/or takes a long time to cool. Cause This condition may be caused by contamination in the A/C refrigerant. Correction If you duplicate this condition and the vehicle VIN is included in the above list, recover the refrigerant using the GE-50957 Contaminated Refrigerant Recovery Machine. Repair direction is based on review and is provided below determined by the 11th VIN digit. Reference the 11th VIN digit to determine the assembly plant the vehicle came from. Note: If the truck was built outside the noted VIN breaks or if PIE0630 is not included in Service Information section of VIS , perform the regular published A/C diagnosis in eSI. Remove the inlet and outlet lines from the compressor, the compressor solenoid and the lines to the TXV. 2020/21 Equinox or 2021 Blazer built at the Ramos plant. (11th VIN Digit = S) Inspect the lines and ports at the points opened up, verify contamination present on compressor solenoid. (see examples below.) Inspect the picture of the TXV . If there is solid contamination in the TXV you will need to replace the entire A/C system. If it is clean or there is just oil and/or dye present (see examples below) you will need to replace everything EXCEPT the evaporator. 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. 2021 Equinox or Terrain built at the SLP plant (11th VIN Digit = L) Verify contamination present on compressor solenoid. (see examples below) Inspect the compressor inlet/ outlet lines and port and also the TXV. If there is solid contamination in the TXV, you will need to replace the entire system. Oil and/or dye present is normal. (See examples below.) 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. 5787215 Shown in the picture above is a contaminated Compressor Solenoid. 5899621 Shown in the picture above is a clean Compressor Inlet/Outlet (Some oil and greenish dye is normal) 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 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 vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN
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