Silverado 1500 4WD V8-6.0L (2010)
Control Module HVAC: Customer Interest
A/C - Excessive Cabin Moisture/Reduced Window Clearing
TECHNICAL
Bulletin No.: 11-01-38-001
Date: February 28, 2011
Subject: Excessive Cabin Moisture / Reduced Window Clearing (Reprogram HVAC System Control Module)
Models:
2010-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2010-2011 GMC Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
All with RPO CJ3 or C67 (Manual Air Conditioning)
Condition
In rare cases, some customers may comment on excessive cabin moisture or difficulty keeping the windows clear in low ambient temperatures.
Cause
This concern may be caused by the recirculation door being in the recirculation position while the mode is set to a floor through defrost position.
Correction
Important
DO NOT replace the HVAC control module for this concern.
Revised software has been developed to address this condition.
Technicians are to reprogram the HVAC Control Module using the Service Programming System (SPS) with the latest software currently available in
TIS2WEB.
When using a Tech 2(R) or a Multiple Diagnostic Interface (MDI) for reprogramming, ensure that it is updated with the latest software version.
During programming, the battery voltage must be maintained within the proper range of 12-15 Volts. Only use the approved Midtronics(R) PSC 550
Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
