GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Grand Prix 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 HVAC Module Assembly Replacement

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Remove the engine air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls--3.1L or Air Cleaner Assembly Replacement in Engine Controls--3.8L.
  3. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  4. Remove the cross vehicle beam. Refer to Instrument Panel Tie Bar Replacement in Instrument Panel, Gauges and Console.
  5. Disconnect the A/C lines at the evaporator block fitting. Refer to Suction Hose Replacement .
  6. Disconnect the heater hoses at the heater core. Refer to Heater Hoses Replacement .
  7. Disconnect the vacuum hoses.
  8. Disconnect the electrical connectors.

    9. Object Number: 508311 Size: SH

    Important: Position the heater core outlet cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly.

  9. Remove the heater core outlet cover screws.
  10. Remove the heater core outlet cover.

    11. Object Number: 282300 Size: SH
  11. Remove the evaporator drain elbow.

    12. Object Number: 507700 Size: SH
  12. Remove the HVAC control module to dash nuts.
  13. Remove the HVAC control module.

    14. Object Number: 283719 Size: SH
  14. Remove all of the outer HVAC control module seals (1,2,3).

Installation Procedure

    Object Number: 283719 Size: SH
  1. Install new outer HVAC control module seals (1,2,3).
  2. Install the HVAC control module to the vehicle.

    3. Object Number: 507700 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the HVAC control module to dash nuts.

    4. Tighten
    Tighten the HVAC control module nuts to 10 N·m (89 lb in).


    Object Number: 282300 Size: SH
  4. Install the evaporator drain elbow.
  5. Connect the electrical connectors.
  6. Connect the vacuum hoses.

    7. Object Number: 508311 Size: SH
  7. Install the heater core outlet cover.
  8. Install the heater core outlet cover screws.

    9. Tighten
    Tighten the heater core outlet cover screws to 1.5 N·m (13 lb in).

  9. Install the cross vehicle beam. Refer to Instrument Panel Tie Bar Replacement in Instrument Panel, Gauges and Console.
  10. Connect the heater hoses at the heater core. Refer to Heater Hoses Replacement .
  11. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  12. Install the A/C lines at the evaporator block fitting. Refer to Suction Hose Replacement .
  13. Install the engine air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls--3.1L or Air Cleaner Assembly Replacement in Engine Controls--3.8L.
  14. Evacuate and charge the A/C system. Refer to Refrigerant Recovery and Recharging .
  15. Test the component fittings for leaks using J 39400 .