GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 LeSabre 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 HVAC Module Assembly Replacement
    • J 43600 ACR 2000 Air conditioning Service Center
    • J 38185 Hose Clamp Plier
    • J 39400-A Halogen Leak Detector

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Drain the coolant. Refer to Cooling System Draining and Filling in Engine Cooling.

    3. Object Number: 419227 Size: SH
  3. Remove the evaporator hose nut.
  4. Disconnect the evaporator hose connection at the evaporator.

    5. Object Number: 419273 Size: SH
  5. Remove the heater hoses from the heater core using the J 38185 .
  6. Plug the heater core and evaporator openings to prevent leaking into the vehicle when removing module assembly.
  7. Remove the IP assembly. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.

    8. Object Number: 419272 Size: SH
  8. Remove the defroster duct retaining screws (1,2).
  9. Remove the defroster duct nut (3).
  10. Remove the defroster duct.
  11. Remove the air distributor duct screws.
  12. Remove the air distributor duct.

    13. Object Number: 419246 Size: SH
  13. Disconnect the blower control module (1) connection.
  14. Disconnect the I/P to HVAC module (2) connection.

    15. Object Number: 247142 Size: SH
  15. Remove the HVAC module retaining nuts (1-5).
  16. Remove the HVAC module.

Installation Procedure

    Object Number: 247142 Size: SH
  1. Install the HVAC module.

    2. 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 nuts to the dash (1-5). Refer to the illustration for the HVAC module fastener torque sequence.

    3. Tighten
    Tighten the nuts to 9 N·m (80 lb in).


    Object Number: 419246 Size: SH
  3. Connect the blower control module (1) connection.
  4. Connect the I/P harness to HVAC module connector (2).
  5. Install the defroster duct.

    6. Object Number: 419272 Size: SH
  6. Install the defroster duct module mounting screws (1,2).

    7. Tighten
    Tighten the screws to 1.4 N·m (12 lb in).

  7. Install the defroster duct mounting nut (3) to the front of dash.

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

  8. Install the air distributor duct.
  9. Install the air distributor duct screws.

    10. Tighten
    Tighten the screws to 1.4 N·m (12 lb in).

  10. Install the IP assembly. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.

    11. Object Number: 419273 Size: SH
  11. Install the heater hoses to the heater core using the J 38185 .

    12. Important: Inspect the seal washers for damage before reinstalling the A/C lines and hoses.

    If any damage is noted during inspection, the suspect seal must be replaced.

    Flat washer type seals do not require lubrication.


    Object Number: 419227 Size: SH
  12. Connect the evaporator hose connection to the evaporator.
  13. Install the evaporator hose nut.

    14. Tighten
    Tighten the nut to 20 N·m (15 lb ft).

  14. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  15. Leak test the component using the J 39400-A .
  16. Refill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.