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Installation Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2001 Oldsmobile Bravada, 2001 GMC Sonoma, 2001 GMC Jimmy, 2001 Chevrolet S10 Pickup, and 2001 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. If replacing the HVAC module, transfer the components from the old heat/vent module as necessary.
    2. Fig 1: Identifying HVAC Module & Bolts
    G00390714Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Before installing the HVAC module to the vehicle, ensure that the HVAC module mounting studs are located in the proper positions.
  2. Install the HVAC module to the vehicle.
  3. Connect the heater hoses to the heater core.
  4. Connect all of the vacuum lines to the heater assembly.
  5. Connect all of the electrical connectors to the HVAC module.
  6. Install the bottom right HVAC module mounting bolt from inside the vehicle approximately halfway into the threads.
    NOTE: 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.
  7. On the Utility only, install the HVAC module mounting stud located at the lower right side of the heater core to heater hoses connection in the engine compartment.

    Tighten 

    Tighten the HVAC module mounting stud to 4.5 N.m (40 lb in).

  8. On vehicles with A/C only, raise the vehicle.
  9. On the Utility only, install the bottom right HVAC mounting studs. Ask an assistant to pull the bottom right corner of the HVAC module back from inside the vehicle.

    Tighten 

    Tighten the heat/vent module mounting studs to 4.5 N.m (40 lb in).

  10. On the Utility only, install the A/C evaporator and blower module heat shield bracket.
  11. Install the heater/vent module mounting nuts.

    Tighten 

    Tighten the HVAC module mounting studs to 4.5 N.m (40 lb in).

  12. On the Utility only, slide the A/C evaporator and blower module heat shield into the original position.
  13. On the Utility only, install the A/C evaporator and blower module heat shield screws.

    Tighten 

    Tighten the A/C evaporator and blower module heat shield screws 2.2 N.m (19 lb in).

  14. On vehicles with A/C only, install the right front tire.
    15. Fig 2: Identifying Wheelhouse Panel & Screws
    G00390713Courtesy of GENERAL MOTORS CORP.
  15. On vehicles with A/C only, lower the vehicle.
  16. Install the bottom right HVAC module mounting bolt from inside the vehicle.

    Tighten 

    Tighten the HVAC module mounting bolt to 4.5 N.m (40 lb in).

  17. On vehicles with A/C only, install the right wheel house panel.
  18. Install the HVAC module mounting nut located at the lower right side of the heater core to heater connection.

    Tighten 

    Tighten the HVAC module mounting nut to 4.5 N.m (40 lb in).

  19. Install the HVAC module mounting bolt located at the lower left side of the heater core to heater hose connection.

    Tighten 

    Tighten the HVAC module mounting bolt to 4.5 N.m (40 lb in).

  20. On vehicles with the 2.2 L engine only, install the engine wiring harness bracket located at the rear of the intake manifold. Refer to 2.2L 4-CYLINDER .
  21. Install the HVAC module mounting bolt through the blower motor resistor or service access cover opening.

    Tighten 

    Tighten the HVAC module mounting bolt to 4.5 N.m (40 lb in).

  22. On vehicles without automatic climate control, install the blower motor resistor. Refer to BLOWER MOTOR RESISTOR  .
  23. On vehicles with automatic climate control only, install the service access cover (2).
  24. On vehicles with automatic climate control only, install the service access cover mounting screws (1).

    Tighten 

    Tighten the screws to 1.9 N.m (17 lb in).

    25. Fig 3: Identifying Service Access Cover & Mounting Screws
    G00390712Courtesy of GENERAL MOTORS CORP.
  25. On vehicles with automatic climate control only, install the outer layer of the A/C evaporator and blower module.
    26. Fig 4: Identifying Outer Layer Of A/C Evaporator & Blower Module
    G00390711Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use RTV. Apply the adhesive bead as straight as possible. Allow the adhesive to set for 15 minutes or until the adhesive becomes tacky.
  26. Seal the cut line using black weather-strip adhesive.
  27. Refill the engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM  .
  28. Install the instrument panel. Refer to INSTRUMENT PANEL  .
  29. For m.y. 2001, calibrate the HVAC module actuator. Refer to ACTUATOR RECALIBRATION  .
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