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 MANUALSCHEVROLET2008AVALANCHE 1500 4WD V8-6.0LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGAIR DOORSERVICE AND REPAIRREMOVAL AND REPLACEMENTMODE DOOR REPLACEMENT - UPPER
2008 Chevrolet Avalanche 1500 4WD V8-6.0L
Mode Door Replacement - Upper
2008 Chevrolet Avalanche 1500 4WD V8-6.0LSECTION Mode Door Replacement - Upper
Mode Door Replacement - Upper
Removal Procedure
Important: The upper mode door (6) is serviced with the upper HVAC module case (3).
1. Remove the HVAC module.
2. Disconnect the electrical connector (3) from the mode actuator (4).
3. Remove the screws from the mode actuator (4).
4. Remove the mode actuator (4) from the HVAC module assembly (1).
5. If equipped remove the heat stakes (1) from the HVAC module (2) with a screwdriver and a hammer.
6. If equipped remove the HVAC module assembly screws.
7. Separate the HVAC module assembly.
8. Remove the lever (7) from the upper mode door/upper HVAC module case (6).
Installation Procedure
1. Install the lever (7) to the upper mode door/upper HVAC module case (6).
2. Install the HVAC module assembly halves.
Notice: Refer to Fastener Notice.
Important: For every heat stake removed ensure that you install a screw.
3. Install the screws to the HVAC module assembly.
Tighten the screws to 1.6 N.m (14 lb in).
4. Install the mode actuator to the HVAC module assembly.
5. Install the screws to the mode actuator.
Tighten the screws to 1.6 N.m (14 lb in).
6. Connect the electrical connector to the mode actuator.
7. Install the HVAC module assembly.
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.