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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1653 (HVAC SYSTEMS - TROUBLESHOOTING)REPAIR INSTRUCTIONSHVAC MODULE REPLACEMENT - AUXILIARYINSTALLATION PROCEDURE
2004 Oldsmobile Bravada AWD

Installation Procedure

2004 Oldsmobile Bravada AWDSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 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: Blower Motor - Auxiliary (Body VIN Type 6)
    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: Mid-Upper Air Distribution Duct/Lower Air Duct
    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 UPPER (TRAILBLAZER, ENVOY, BRAVADA) in Interior Trim.
  7. Raise and support the vehicle.
    8. Fig 3: Heater Hoses - 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: HVAC Assembly Components
    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 in Engine Cooling.
  15. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging .
  16. Leak test the fitting of the component using the J 39400-A  Halogen Leak Detector. See Special Tools and Equipment .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.