A/C Inoperative, Blows Warm or Poor Performance Due to Low Refrigerant Charge, Freon Leak – 2016 Chevrolet Buick GMC

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Copyright 2017 General Motors LLC. All Rights Reserved.
Service Bulletin
File in Section: –
Bulletin No.: 16-NA-046
Date: July, 2017
TECHNICAL
Subject: A/C Inoperative, Blows Warm or Poor Performance Due to Low Refrigerant Charge, Refrigerant Leak
Attention: This Bulletin also applies to any of the models that may be Export from North America vehicles.
This Bulletin replaces PIT5335A. Please discard PIT5335A.
Brand: Model: Model Year: Breakpoint: Engine: Transmission:
from to from to
Buick Enclave 2013 2016
Vehicles Built Prior to
October 6, 2015 Chevrolet Traverse 2013 2016 All All
GMC Acadia 2013 2016
Condition Some customers may comment that the A/C is blowing warm, is exhibiting poor performance or of a general lack of air conditioning, or low charge.
Cause
The cause of this condition may be that, during operation, the auxiliary evaporator blower motor may emit brush dust that contains some copper particles. These particles could lead to accelerated corrosion to the auxiliary evaporator and a small refrigerant leak.
Additional Options Equipped with Auxiliary Air Conditioning (RPO CJ2)
Correction
After performing normal SI diagnostics, if the source of the leak is not found, check for a leak at the auxiliary evaporator core face. Remove the auxiliary blower control module and insert the GE 50078 Electronic Leak Detector to test for a leak, as well as employing the use of a black light.
If a leak is found, continue to the Service Procedure below to replace the evaporator, blower/fan assembly (if necessary) and thoroughly clean the interior of the evaporator case.

Service Procedure
4418319
1. Remove the auxiliary A/C evaporator (1). Refer to Auxiliary Air Conditioning Evaporator Replacement in SI.
4418321
2. Remove the auxiliary blower motor assembly (1).
Refer to Auxiliary Blower Motor Replacement in SI.
3. With the evaporator case disassembled, use compressed air to blow any copper dust from the inside of the case.
4418323
4. Use GM glass cleaner, P/N 19287404 (in Canada, 88865156), and a cloth to wipe down the linear power module and the inside surfaces, (1) and (2), of the case.
5. Install the new auxiliary A/C evaporator. Refer to Auxiliary Air Conditioning Evaporator Replacement in SI.
6. Inspect the auxiliary blower motor assembly to identify if it is an original motor or a replacement:
4840376
• An original blower motor will contain a cage with openings, as shown in the graphic above.
These original motors should be replaced, and not reinstalled. Refer to Auxiliary Blower
Motor Replacement in SI.

4840377
• A replacement blower motor will contain a closed cage, as shown in the graphic above. A replacement blower motor can be reinstalled.
Refer to Auxiliary Blower Motor Replacement in SI.
Parts Information
Description Part
Number
Qty
MOTOR ASM-AUX BLO 23361388 1
EVAPORATOR ASM-AUX
A/C
20827668 1
CLEANER, GLASS 18 OZ
AEROSOL (10% VOC)
Glass Cleaner 500 g
(Canada)
19287404
88865156
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description Labor Time
4417169 A/C System Analysis Use Published Labor Operation Time
4480408* Replace Auxiliary
Evaporator, Blower Motor
Assembly and Clean Case
2.8 hrs**
*This is a unique Labor Operation for Bulletin use only.
**This includes Diagnostic Analysis and Recover/Recharge
R-134a A/C System
Version 2
Modified July 20, 2017 – Added auxiliary blower motor assembly inspection to Service Procedure.

#16-NA-046: A/C Inoperative, Blows Warm or Poor Performance Due to Low Refrigerant Charge, Freon Leak – (Feb 17, 2016)

This Bulletin replaces PIT5335A. Please discard PIT5335A.

Brand:	Model:	Model Year:		Breakpoint:		Engine:	Transmission:
		from	to	from	to
Buick	Enclave	2013	2016	Vehicles Built Prior to October 6, 2015		All	All
Chevrolet	Traverse	2013	2016
GMC	Acadia	2013	2016

Correction

After performing normal SI diagnostics, if the source of the leak is not found, check for a leak at the auxiliary evaporator core face. Remove the auxiliary blower control module and insert the GE 50078 Electronic Leak Detector to test for a leak, as well as employing the use of a black light.

If a leak is found, continue to the Service Procedure below to replace the evaporator, blower/fan assembly and thoroughly clean the interior of the evaporator case.

Service Procedure

1. Remove the auxiliary a/c evaporator (1). Refer to Auxiliary Air Conditioning Evaporator Replacement in SI.

2. Remove the auxiliary blower motor assembly (1). Refer to Auxiliary Blower Motor Replacement in SI.
3. With the evaporator case disassembled, use compressed air to blow any copper dust from the inside of the case.

4. Use GM glass cleaner, P/N 19287404 (in Canada, 88865156), and a cloth to wipe down the linear power module and the inside surfaces, (1) and (2), of the case.
5. Install the new auxiliary a/c evaporator. Refer to Auxiliary Air Conditioning Evaporator Replacement in SI.
6. Install the new auxiliary blower motor assembly. Refer to Auxiliary Blower Motor Replacement in SI.

Parts Information

Description	Part Number	Qty
MOTOR ASM-AUX BLO	23361388 General Motors 23361388 - OEM Part General Motors 23361388 - OEM Part $205.63 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-19 / Affiliate links / Images from Amazon Product Advertising API	1
EVAPORATOR ASM-AUX A/C	20827668 General Motors 20827668, A/C Evaporator Core Genuine Universal Air Conditioner part that fits your specific vehicle A/C Evaporator Core Part Number: EV939827PFC Manufactured to meet specifications for fit, form, and function $273.82 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API	1
CLEANER, GLASS 18OZ AEROSOL (10% VOC)	19287404 No products found.	1
Glass Cleaner 500 g (Canada)	88865156	1

Warranty Information

For vehicles repaired under warranty, use:

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