Yukon Denali 2WD V8-6.0L Hybrid (2010)
Control Module HVAC: Customer Interest
A/C - Reduced Windshield Clearing/Defrost
TECHNICAL
Bulletin No.: 10-01-38-001
Date: March 02, 2010
Subject: Reduced Windshield Clearing\Defrost at Low Ambient Temperatures (Reprogram HVAC Control Module)
Models:
2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2010 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon XL Denali
All Equipped with HVAC System RPOs C42, C67 or CJ3
All Built Prior to February 17, 2010
Condition
In rare cases, some customers may comment that the HVAC system has reduced defrost or added difficulty keeping the windshield clear in low ambient
temperatures.
Cause
This condition may be caused by the airflow calibrations which can contribute to the above condition. Calibration changes at the start of the 2010 model
year may not meet some customers' expectations. Testing has confirmed that defrost levels will meet requirements.
Correction
Important
DO NOT replace the HVAC Control Module for this concern.
Reprogram the HVAC Control Module with the latest software calibration.
Important
Select the correct calibration files for the appropriate vehicle configuration (body style) and RPO codes.
A revised calibration has been developed to address this condition. Technicians are to reprogram the HVAC Control Module using the Service
Programming System (SPS) with the latest calibrations available on TIS2WEB. Refer to HVAC System Control Module Programming and Setup in SI.
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 above.
Disclaimer
