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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 186 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> Auxiliary HVAC Module Replacement (Suburban XL) >> Installation Procedure

Installation Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Auxiliary HVAC Module Assembly & Bolts
    GM1846828Courtesy of GENERAL MOTORS CORP.
  1. Install the auxiliary HVAC module assembly (2) to the vehicle.
  2. Install the 2 bolts (1) inside the vehicle in order to retain the auxiliary HVAC module to the vehicle.
  3. Install the forward auxiliary air duct.
  4. Connect the electrical connectors to the auxiliary HVAC module.
  5. Install the right rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side (Standard Wheelbase) or Rear Quarter Trim Panel Replacement - Right Side (Extended Wheelbase) .
  6. Raise the vehicle.
    7. Fig 2: Identifying Heater Lines, Air Conditioning Lines & 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 to the auxiliary HVAC module.

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

  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 Cooling System Draining and Filling (Static Fill) .
  12. Recharge the refrigerant to the system. Refer to Refrigerant Recovery and Recharging (Non HP2)  or Refrigerant Recovery and Recharging (HP2) .
  13. Leak test the fittings of the component using the J 39400-A  . See Special Tools .
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