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Home >> Pontiac >> 2004 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 152 (HVAC Systems - General Servicing) >> Repair Instructions >> HVAC Module Replacement - Auxiliary >> Installation Procedure
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Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install new HVAC module pass through seal. Refer to HVAC Module Pass Thru Seal Replacement - Auxiliary .
    2. Fig 1: Auxiliary HVAC Module
    GM735953Courtesy of GENERAL MOTORS CORP.
  2. Install the HVAC module (1).
    3. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. Install the HVAC module mounting bolts (5).

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    4. Fig 2: Rear Ducting Views
    GM735895Courtesy of GENERAL MOTORS CORP.
  4. Install the air outlet ducts (5).
  5. Connect the electrical connectors.
  6. Install the right side rear quarter trim panel. Refer to Trim Panel Replacement - Rear Quarter - Right (TrailBlazer, Envoy, Bravada) or Trim Panel Replacement - Rear Quarter - Right (TrailBlazer EXT, Envoy XL) in Interior Trim.
  7. Raise and support the vehicle.
    8. Fig 3: Auxiliary Heater Hose Block Fittings
    GM400657Courtesy of GENERAL MOTORS CORP.
  8. Connect the heater hoses to the heater core.
  9. Install the nuts to the HVAC module studs.

    Tighten:  Tighten the nuts to 10 N.m (89 lb in).

  10. Remove the cap or tape from the A/C lines.
  11. Install the new O-ring seals. Refer to O-Ring Replacement .
    12. Fig 4: Rear A/C Line Block Fittings
    GM735776Courtesy of GENERAL MOTORS CORP.
  12. Install the nuts (3) to the evaporator core studs.

    Tighten:  Tighten the nuts to 20 N.m (15 lb ft).

  13. Lower the vehicle.
  14. Fill the cooling system. Refer to Draining and Filling Cooling System (LL8) or Draining and Filling Cooling System (LM4) in Engine Cooling.
  15. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging .
  16. Leak test the fittings of the components using the J 39400-A  . See Special Tools and Equipment .
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