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.
2003 Hummer H2 V8-6.0LFACTORY OEM SERVICE PROCEDURE
HVAC Control Module Replacement
HVAC CONTROL MODULE REPLACEMENT
REMOVAL PROCEDURE
1. Remove the center IP trim bezel.
2. Remove the screws from the HVAC control module (2).
3. Depress the HVAC control module tabs (3) and remove the HVAC control module (2) from the IP (4).
4. Reposition the HVAC control module (2) from the IP panel (1).
5. Disconnect the electrical connectors from the HVAC control module (2).
INSTALLATION PROCEDURE
IMPORTANT: The Key should be in the off position when connecting the electrical connectors to ensure proper calibration.
1. Connect the electrical connectors to the HVAC control module (2).
IMPORTANT: Ensure that the HVAC control module tabs lock into place.
2. Install the HVAC control module (2) to the IP (1).
NOTE: Refer to Fastener Notice in Service Precautions.
3. Install the screws to the HVAC control module (2).
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
4. Install the center IP trim bezel.
IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating.
If interrupted improper HVAC performance will result.
5. Start the vehicle and let run for one minute
REMOVAL PROCEDURE
1. Remove the center IP trim bezel.
2. Remove the screws from the HVAC control module (2).
3. Depress the HVAC control module tabs (3) and remove the HVAC control module (2) from the IP (4).
4. Reposition the HVAC control module (2) from the IP panel (1).
5. Disconnect the electrical connectors from the HVAC control module (2).
INSTALLATION PROCEDURE
IMPORTANT: The Key should be in the off position when connecting the electrical connectors to ensure proper calibration.
1. Connect the electrical connectors to the HVAC control module (2).
IMPORTANT: Ensure that the HVAC control module tabs lock into place.
2. Install the HVAC control module (2) to the IP (1).
NOTE: Refer to Fastener Notice in Service Precautions.
3. Install the screws to the HVAC control module (2).
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
4. Install the center IP trim bezel.
IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating.
If interrupted improper HVAC performance will result.
5. Start the vehicle and let run for one minute
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.