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Air Conditioning Compressor and/or Serpentine Belt Noise at Vehicle Startup with Ambient Temperature Above 35 Degrees Celsius (95 Degrees Fahrenheit)

Subject:Air Conditioning Compressor And/Or Serpentine Belt Noise At Vehicle Startup With Ambient Temperature Above 35° C (95° F) (Reprogram Powertrain Control Module (PCM))

Models:2007-2008 Cadillac Escalade Models
2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007-2008 GMC Sierra, Yukon Models
with Air Conditioning (RPOs CJ2 or CJ3)



Condition

Some customers may comment on air conditioning (A/C) compressor and/or serpentine belt noise at vehicle startup with the ambient temperature above 35° C (95° F). Others may describe the noise as a belt chirp or as a thumping/grinding noise coming from the A/C compressor at vehicle startup.

Cause

This condition may be caused by the A/C compressor trying to move liquid refrigerant through the system.

Correction

Do This

Don't Do This

Reprogram the PCM with an updated calibration.

Do Not replace the compressor, compressor clutch, serpentine belt and/or the belt tensioner.

A revised calibration has been developed to address this concern. Technicians are to reprogram the Powertrain Control Module (PCM) using SPS with the latest software available on TIS2WEB. Refer to the Engine Control Module Programming and Setup procedures in SI. As always, make sure your Tech 2® is updated with the latest software version.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

Failure Code

J6354

Powertrain Control Module Engine Reprogramming with SPS

Use Published Labor Operation Time

93 (Technical Service Bulletin)*

*Please use the Failure Code 93 for any warranty claims submitted using this bulletin.