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.
2007 Chevrolet Express 2500 V8-6.0LFACTORY OEM SERVICE PROCEDURE
Auxiliary HVAC Module Replacement
Auxiliary HVAC Module Replacement
Removal Procedure
1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
2. Drain the engine coolant. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (Vac N Fill).
3. Remove the left rear quarter trim panel.
4. Remove the left rear corner garnish molding.
5. Remove the air distribution duct upper.
6. Remove the air distribution duct lower.
7. Disconnect the electrical connectors from the auxiliary HVAC module (1).
8. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
9. Remove the cover from the underside of the auxiliary HVAC module.
10. Remove the one retaining nut in order to remove the auxiliary evaporator underbody rear tube assembly from the core.
11. Disconnect the heater lines from the underside of the auxiliary HVAC module.
12. Remove the retaining nuts from the underside of the auxiliary HVAC module.
13. Lower the vehicle.
14. Remove the auxiliary HVAC module.
Installation Procedure
1. Install the auxiliary HVAC module.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
Notice: Refer to Fastener Notice.
3. Install the retaining nuts to the underside of the auxiliary HVAC module.
Tighten the auxiliary heater retaining nuts to 10 N.m (89 lb in).
4. Connect the heater lines to the underside of the auxiliary heater.
5. Install the one retaining nut to the auxiliary evaporator underbody rear tube assembly to the core.
Tighten the nut to 28 N.m (21 lb ft).
6. Install the cover to the underside of the auxiliary HVAC module.
7. Lower the vehicle.
8. Connect the electrical connectors to the auxiliary HVAC module (1).
9. Install the air distribution duct upper.
10. Install the air distribution duct lower.
11. Install the left rear corner garnish molding.
12. Install the left rear quarter trim panel.
13. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
14. Fill the engine coolant. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (Vac N Fill).
Factory Service Tools
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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.
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