GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Regal (China) 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 HVAC Module Assembly Replacement

Removal Procedure
  1. Remove the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  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 Evaporator Tube Replacement .
  6. Disconnect the heater hoses at the heater core. Refer to Heater Hoses Replacement .

    7. Object Number: 508311 Size: SH

    Important: If equipped with C60, position the heater core cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly.

  7. Remove the heater core outlet cover screws, if equipped with C60.
  8. Remove the heater core outlet cover, if equipped with C60.

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

    10. Object Number: 507700 Size: SH
  10. Remove the HVAC module to dash nuts.
  11. Disconnect the vacuum hoses.
  12. Disconnect the electrical connectors.
  13. Remove the HVAC module.

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

Installation Procedure

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

    2. 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.

  2. Install the HVAC module to dash nuts.

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

  3. Connect the electrical connectors.
  4. Connect the vacuum hoses.

    5. Object Number: 508311 Size: SH
  5. Install the heater core outlet cover, if equipped with C60.
  6. Install the heater core outlet cover screws, if equipped with C60.

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

  7. Install the cross vehicle beam. Refer to Instrument Panel Tie Bar Replacement in Instrument Panel, Gauges and Console.
  8. Connect the heater hoses at the heater core. Refer to Heater Hoses Replacement .
  9. Install the A/C lines at the evaporator block fitting. Refer to Evaporator Tube Replacement .
  10. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  11. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  12. Leak test the A/C system. Refer to Leak Testing .
  13. Install the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.