Loss Of HVAC System Mode and/or Temperature Control (Replace HVAC Control Module) (04-01-39-007)

Publication date: 2004-06-17
Reference number: 04-01-39-007

Loss Of HVAC System Mode and/or Temperature Control (Replace HVAC Control Module)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 04-01-39-007, Date of Issue: June 17, 2004

Affected Model(s):

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 (SI Document ID #845221).

Replace the HVAC control module. Refer to the HVAC Control Module Replacement procedure in the HVAC System - Automatic sub-section of the Service Manual.

Part Information

Part Number	Description
15126606 Cadillac, Celsius Temperature Display (RPO U34)	HVAC Control Assembly (Module)
15126605 Cadillac, Minus (-) Celsius Temperature Display (RPO U34)	HVAC Control Assembly (Module)
15126604 Chevrolet/GMC, Celsius Temperature Display (RPO U34)	HVAC Control Assembly (Module)
15126603 Chevrolet/GMC, Minus (-) Celsius Temperature Display (RPO U34)	HVAC Control Assembly (Module)

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Warranty Information

Labor Operation	Description	Labor Time
D0362	Control Assembly HVAC (IP) - A/C - Replace	Use published labor operation time