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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> HVAC Module Replacement - Auxiliary (Suburban/XL) >> Installation Procedure

Installation Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Auxiliary HVAC Module (Tahoe/Yukon)
    GM612394Courtesy of GENERAL MOTORS CORP.
  1. Install the auxiliary HVAC module assembly (4) to the vehicle.
  2. Install the 2 bolts (3) inside the vehicle in order to retain the auxiliary HVAC module to the vehicle.
    3. Fig 2: View Of Upper Auxiliary Air Duct & Fastener (Tahoe/Yukon)
    GM612462Courtesy of GENERAL MOTORS CORP.
  3. Install the upper auxiliary air duct (1) to the air distributor duct. Install the fastener (5).
  4. Connect the electrical connectors to the auxiliary HVAC module.
  5. Install the right rear quarter trim panel. Refer to Trim Panel Replacement - Rear Quarter - Right (Extended Wheelbase) or Trim Panel Replacement - Rear Quarter - Right (Standard Wheelbase) .
  6. Raise the vehicle.
    7. Fig 3: Identifying Heater Lines, Air Conditioning Lines And Components
    GM1681365Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  7. Install the nuts (6) that secure the auxiliary HVAC module to the vehicle.

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

  8. Install the air conditioning lines (4, 5) and the nut (4) to the auxiliary HVAC module.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

    9. Fig 4: Identifying Heater Lines, Air Conditioning Lines And Components
    GM1681365Courtesy of GENERAL MOTORS CORP.
  9. Install the heater lines (2, 3) to the auxiliary HVAC module at the underside of vehicle.
  10. Lower the vehicle.
  11. Fill the engine coolant. Refer to Draining and Filling Cooling System .
  12. Recharge the refrigerant to the system. Refer to Refrigerant Recovery and Recharging .
  13. Leak test the fittings of the component using the J 39400-A  . See Special Tools .
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