Bulletin No.: 16-NA-046
Date: Feb-2016

Subject:

A/C Inoperative, Blows Warm or Poor Performance Due to Low Refrigerant Charge, Freon Leak

Attention:

This Bulletin also applies to any of the models that may be Export vehicles.

This Bulletin replaces PIT5335A. Please discard PIT5335A.
Brand:

Model:

Model Year:

Breakpoint:

from

to

Buick

Enclave

2013

2016

Chevrolet

Traverse

2013

2016

GMC

Acadia

2013

2016

from

Engine:

Transmission:

All

All

to

Vehicles Built Prior to October 6,
2015

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 and thoroughly clean the interior of the evaporator
case.

Service Procedure

1

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

2

Description

Part Number

Qty

MOTOR ASM-AUX BLO

23361388

1

EVAPORATOR ASM-AUX A/C

20827668

1

CLEANER, GLASS 18OZ AEROSOL (10% VOC)

19287404

1

Glass Cleaner 500 g (Canada)

88865156

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

1

Modified

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 CERTIFICATION

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