Auxiliary HVAC Module Replacement

Auxiliary HVAC Module Replacement

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

1. Recover the refrigerant from the air conditioning (A/C) system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
2. Drain the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) (Service and Repair)Cooling System Draining and Filling (Vac N Fill) (Service and Repair).
3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
4. Remove the right rear wheelhouse liner panel. Refer to Rear Wheelhouse Panel Liner Replacement (Service and Repair).




5. Disconnect the heater lines (2, 3) from the auxiliary HVAC module at the underside of the vehicle.
6. Disconnect the air conditioning lines (4, 5) from the auxiliary HVAC module at the underside of the vehicle.
7. Remove the nuts (6) from the studs (1) that secure the auxiliary HVAC module to the underside of the vehicle.
8. Lower the vehicle.
9. Remove the right rear quarter trim panel. Refer to Quarter Lower Rear Trim Panel Replacement (Traverse with TB5) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Traverse without TB4) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Acadia/OUTLOOK with TB5) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Acadia/OUTLOOK without TB4) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Enclave with TB5) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Enclave without TB4) (Service and Repair).
10. Disconnect the electrical connectors from the auxiliary HVAC module.




11. Remove the upper auxiliary air distributor duct (2). Refer to Auxiliary Air Distributor Duct Replacement - Upper (Auxiliary Air Distributor Duct Replacement - Upper).




12. Remove the lower auxiliary air distributor duct (2). Refer to Auxiliary Air Distributor Lower Duct Replacement (Auxiliary Air Distributor Lower Duct Replacement).




13. Remove the fasteners (3) retaining the auxiliary HVAC module to the vehicle.
14. Remove the auxiliary HVAC module (4) from the vehicle.

Installation Procedure




1. Install the auxiliary HVAC module assembly (4) to the vehicle.
2. Install the 2 bolts (3) inside the vehicle in order to retain the auxiliary HVAC module to the vehicle.




3. Install the upper auxiliary air distributor duct. Refer to Auxiliary Air Distributor Duct Replacement - Upper (Auxiliary Air Distributor Duct Replacement - Upper).




4. Install the lower auxiliary air distributor duct. Refer to Auxiliary Air Distributor Lower Duct Replacement (Auxiliary Air Distributor Lower Duct Replacement).
5. Connect the electrical connectors to the auxiliary HVAC module.
6. Install the right rear quarter trim panel. Refer to Quarter Lower Rear Trim Panel Replacement (Traverse with TB5) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Traverse without TB4) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Acadia/OUTLOOK with TB5) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Acadia/OUTLOOK without TB4) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Enclave with TB5) (Service and Repair)Quarter Lower Rear Trim Panel Replacement (Enclave without TB4) (Service and Repair).




7. Raise the vehicle.
8. Install the nuts that secure the auxiliary HVAC module to the vehicle.
Caution: Refer to Fastener Caution (Fastener Caution).

Tighten the nuts to 9 Nm (80 lb in).

9. Install the air conditioning lines (4, 5) and the nut (6) to the auxiliary HVAC module.

Tighten the nut to 16 Nm (12 lb ft).

10. Install the heater lines (2, 3) to the auxiliary HVAC module at the underside of vehicle.
11. Install the right rear wheelhouse liner panel. Refer to Rear Wheelhouse Panel Liner Replacement (Service and Repair).
12. Lower the vehicle.
13. Fill the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) (Service and Repair)Cooling System Draining and Filling (Vac N Fill) (Service and Repair).
14. Recharge the refrigerant to the system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
15. Leak test the fittings of the component using the J 39400-A .