Housing Assembly HVAC: Service and Repair

Air Conditioning and Heater Module Assembly Replacement

Special Tools

J 39400-A Halogen Leak Detector

Removal Procedure

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
2. Drain the coolant. Refer to Cooling System Draining and Filling (GE 47716) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).
3. Disconnect the heater inlet hose from the heater core. Refer to Heater Inlet Hose Replacement (LH2) (Service and Repair)Heater Inlet Hose Replacement (LY7) (Service and Repair).
4. Disconnect the heater outlet hose from the heater core. Refer to Heater Outlet Hose Replacement (LH2) (Service and Repair)Heater Outlet Hose Replacement (LY7) (Service and Repair).
5. At the evaporator core, disconnect and remove the A/C quick connect fittings from the suction hose and the liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement (Service and Repair).
6. Separate the suction hose and liquid line from the evaporator core.
7. Remove and discard the O-rings.




8. Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Carrier Replacement (Service and Repair).
9. Remove the air inlet assembly.
10. Disconnect the HVAC module electrical connector.
11. Disconnect the HVAC module drain tube (2) from the floor.




12. Remove the lower left HVAC module mounting nut (1).




13. Remove the upper left HVAC module mounting nut (1).
14. Remove the HVAC module from the vehicle.




15. Remove the foam from the A/C lines.
16. Remove the foam from around the heater pipes.

Installation Procedure




1. Install the thick foam packing (1) on the heater core pipes.
2. Install the thin foam packing (2) on the heater core pipes.




3. Install the thick foam packing (1) on the A/C lines.
4. Install the thin foam packing (2) on the A/C lines.




5. Install the HVAC module into the vehicle.

Caution: Refer to Fastener Caution (Fastener Caution).

6. Install the upper left HVAC module mounting nut (1) and tighten to 9 Nm (80 lb in).




7. Install the lower left HVAC module mounting nut (1) and tighten to 9 Nm (80 lb in).
8. Connect the drain tube to the bottom of the HVAC module.




9. Connect the drain tube (2) to the floor.
10. Connect the HVAC electrical connector.
11. Install the air inlet assembly.
12. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement (Service and Repair).
13. Install new O-rings to the suction hose and liquid line. Refer to Air Conditioning O-Ring Seal Replacement (Service and Repair).
14. Connect the suction hose and liquid line to the evaporator core.
15. Install the A/C quick connect fittings to the suction hose and liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement (Service and Repair).
16. Connect the heater inlet hose to the heater core. Refer to Heater Inlet Hose Replacement (LH2) (Service and Repair)Heater Inlet Hose Replacement (LY7) (Service and Repair).
17. Connect the heater outlet hose to the heater core. Refer to Heater Outlet Hose Replacement (LH2) (Service and Repair)Heater Outlet Hose Replacement (LY7) (Service and Repair).
18. Fill the coolant. Refer to Cooling System Draining and Filling (GE 47716) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).
19. Evacuate and recharge the AC system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
20. Leak test the fittings of the component using J 39400-A .