GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 SRX 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 HVAC Module Assembly Replacement

HVAC Module Assembly Replacement Left Hand Drive

Tools Required
    • J 39400-A Halogen Leak Detector
    • J 45689 A/C Quick Joint Tool

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Drain the coolant. Refer to Cooling System Draining and Filling .
  4. Disconnect the inlet heater hose from the heater core. Refer to Heater Inlet Hose Replacement .
  5. Disconnect the outlet heater hose from the heater core. Refer to Heater Outlet Hose Replacement .
  6. Remove the quick connect fitting (1) from the liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .

    7. Object Number: 817540 Size: SH
  7. Disconnect the A/C liquid line from the evaporator .
  8. Remove and discard the O-rings.
  9. Remove the quick connect fitting (1) from the suction line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .

    10. Object Number: 817539 Size: SH
  10. Disconnect the A/C suction line from the evaporator.
  11. Remove and discard the O-rings.

    12. Object Number: 756222 Size: SH
  12. Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Carrier Replacement .
  13. Remove the air inlet assembly.
  14. Disconnect the HVAC module electrical connector.
  15. Disconnect the HVAC module drain tube (2) from the floor.

    16. Object Number: 756217 Size: SH
  16. Press the tab and release the left rear duct from the HVAC module.
  17. Position the left rear heater duct away from the HVAC module.

    18. Object Number: 756215 Size: SH
  18. Press the tab and release the right rear duct from the HVAC module.
  19. Position the right rear heater duct away from the HVAC module.

    20. Object Number: 756232 Size: SH
  20. Remove the lower left HVAC module mounting nut (1).

    21. Object Number: 756237 Size: SH
  21. Remove the upper left HVAC module mounting nut (1).
  22. Remove the HVAC module from the vehicle.

    23. Object Number: 1378982 Size: SH
  23. Remove the foam seals from the A/C evaporator lines.
  24. Remove the foam seals from the heater core pipes.

Installation Procedure

    Object Number: 1378982 Size: SH
  1. Install new foam seals onto the heater core pipes.
  2. Install new foam seals onto the A/C evaporator lines.
  3. Install the HVAC module into the vehicle.

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the upper left HVAC module mounting nut (1).

    5. Tighten
    Tighten the nut to 9 N·m (80 lb in).


    Object Number: 756232 Size: SH
  5. Install the lower left HVAC module mounting nut (1).

    6. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  6. Connect the rear heater ducts to the HVAC module.
  7. Connect the drain tube to the bottom of the HVAC module.

    8. Object Number: 756222 Size: SH
  8. Connect the drain tube (2) to the floor.
  9. Connect the HVAC electrical connector.
  10. Install the air inlet assembly.
  11. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement .
  12. Install new O-rings to the suction line. Refer to O-Ring Replacement .

    13. Object Number: 817539 Size: SH
  13. Install the A/C suction line to the evaporator.
  14. Install the quick connect fitting (1) to the suction line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .
  15. Install new O-rings to the suction line. Refer to O-Ring Replacement .

    16. Object Number: 817540 Size: SH
  16. Install the A/C liquid line to the evaporator .
  17. Install the quick connect fitting (1) to the liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .
  18. Connect the inlet heater hose to the heater core. Refer to Heater Inlet Hose Replacement .
  19. Connect the outlet heater hose to the heater core. Refer to Heater Outlet Hose Replacement .
  20. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  21. Fill the coolant. Refer to Cooling System Draining and Filling .
  22. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  23. Leak test the fittings of the component using J 39400-A .

HVAC Module Assembly Replacement Right Hand Drive

Tools Required
    • J 39400-A Halogen Leak Detector
    • J 45689 A/C Quick Joint Tool

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Drain the coolant. Refer to Cooling System Draining and Filling .
  4. Disconnect the inlet heater hose from the heater core. Refer to Heater Inlet Hose Replacement .
  5. Disconnect the outlet heater hose from the heater core. Refer to Heater Outlet Hose Replacement .
  6. Remove the quick connect fitting (1) from the liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .

    7. Object Number: 817540 Size: SH
  7. Disconnect the A/C liquid line from the evaporator .
  8. Remove and discard the O-rings.
  9. Remove the quick connect fitting (1) from the suction line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .

    10. Object Number: 817539 Size: SH
  10. Disconnect the A/C suction line from the evaporator.
  11. Remove and discard the O-rings.

    12. Object Number: 1857705 Size: SH
  12. Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Carrier Replacement .
  13. Remove the air inlet assembly.
  14. Disconnect the HVAC module electrical connector.
  15. Disconnect the HVAC module drain tube (2) from the floor.

    16. Object Number: 1857706 Size: SH
  16. Press the tab and release the left rear duct from the HVAC module.
  17. Position the left rear heater duct away from the HVAC module.

    18. Object Number: 756215 Size: SH
  18. Press the tab and release the right rear duct from the HVAC module.
  19. Position the right rear heater duct away from the HVAC module.

    20. Object Number: 756232 Size: SH
  20. Remove the lower left HVAC module mounting nut (1).

    21. Object Number: 756237 Size: SH
  21. Remove the upper left HVAC module mounting nut (1).
  22. Remove the HVAC module from the vehicle.

    23. Object Number: 1378982 Size: SH
  23. Remove the foam seals from the A/C evaporator lines.
  24. Remove the foam seals from the heater core pipes.

Installation Procedure

    Object Number: 1378982 Size: SH
  1. Install new foam seals onto the heater core pipes.
  2. Install new foam seals onto the A/C evaporator lines.
  3. Install the HVAC module into the vehicle.

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the upper left HVAC module mounting nut (1).

    5. Tighten
    Tighten the nut to 9 N·m (80 lb in).


    Object Number: 756232 Size: SH
  5. Install the lower left HVAC module mounting nut (1).

    6. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  6. Connect the rear heater ducts to the HVAC module.
  7. Connect the drain tube to the bottom of the HVAC module.

    8. Object Number: 1857705 Size: SH
  8. Connect the drain tube (2) to the floor.
  9. Connect the HVAC electrical connector.
  10. Install the air inlet assembly.
  11. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement .
  12. Install new O-rings to the suction line. Refer to O-Ring Replacement .

    13. Object Number: 817539 Size: SH
  13. Install the A/C suction line to the evaporator.
  14. Install the quick connect fitting (1) to the suction line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .
  15. Install new O-rings to the suction line. Refer to O-Ring Replacement .

    16. Object Number: 817540 Size: SH
  16. Install the A/C liquid line to the evaporator .
  17. Install the quick connect fitting (1) to the liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .
  18. Connect the inlet heater hose to the heater core. Refer to Heater Inlet Hose Replacement .
  19. Connect the outlet heater hose to the heater core. Refer to Heater Outlet Hose Replacement .
  20. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  21. Fill the coolant. Refer to Cooling System Draining and Filling .
  22. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  23. Leak test the fittings of the component using J 39400-A .