K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Control Module HVAC: Customer Interest
A/C - Loss of Mode or Temperature Control
Bulletin No.: 04-01-39-007
Date: June 17, 2004
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control (Replace HVAC Control Module)
Models:
2002 Cadillac Escalade, Escalade EXT
1999-2002 Chevrolet Silverado, Suburban, Tahoe
2002 Chevrolet Avalanche
1999-2002 GMC Denali, Sierra, Yukon, Yukon XL
2001 GMC Sierra C3
2002 GMC Sierra Denali
with Automatic HVAC System (RPO C68)
Condition
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
An HVAC control module logic lock-up may be the cause of these conditions.
Correction
Important:
Prior to replacing the HVAC control head, review Corporate Bulletin Number 01-01-39-007.
Replace the HVAC control module. Refer to the HVAC Control Module Replacement procedure in the HVAC System - Automatic sub-section of the
Service Manual.
