Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2000C TAHOE 2WD V8-5.7L VIN RREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL MODULE HVACTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTA/C - LOSS OF MODE OR TEMPERATURE CONTROL
2000 Chevrolet C Tahoe 2WD V8-5.7L VIN R
A/C - Loss of Mode or Temperature Control
2000 Chevrolet C Tahoe 2WD V8-5.7L VIN RSECTION 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.
Part Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
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.
Part Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.