Rear Heater-A/C Unit Replacement and Service

REMOVE AND INSTALL


WARNING: On vehicles equipped with rear A/C, the refrigerant system must be discharged before performing the following operation. The engine cooling system must also be relieved of all pressure.

Rear Heater Plumbing:

Rear A/C Plumbing:

1. Drain engine cooling system. Disconnect heater hoses at rear heater-A/C unit. Refer to: "Engine, Cooling and Exhaust : Cooling System : Service and Repair" Service and Repair
2. Discharge refrigerant system. Disconnect A/C plumbing from rear heater-A/C unit. Refer to: "Testing and Inspection" Testing and Inspection

Rear Heater-A/C Components:

3. Remove left lower quarter trim panel. Refer to: "Body and Frame : Interior Trim : Trim Panel : Service and Repair" Service and Repair
4. Remove the attaching screws securing the air distribution duct to the rear wheel housing.
5. Remove the attaching screws securing the heater unit to the floor pan.
6. Remove attaching screw securing the unit to the quarter panel support.
7. Lift the unit enough to clear the floor pan and remove the unit from the vehicle.

To Install, Reverse the preceding operation. Install new gaskets at refrigerant lines and expansion valve. Evacuate and charge the refrigerant system. Refill the cooling system. Test for leaks and overall performance.