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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 (Tahoe/Yukon/Escalade) >> Removal Procedure

Removal 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.
  1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging (Non HP2)  or Refrigerant Recovery and Recharging (HP2) .
  2. Drain the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) .
  3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
    4. Fig 1: Identifying Heater Lines, Air Conditioning Lines & Components
    GM1681365Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the heater lines (2, 3) from the auxiliary HVAC module at the underside of the vehicle.
  5. Disconnect the air conditioning lines (4, 5) from the auxiliary HVAC module at the underside of the vehicle.
  6. Remove the nuts (6) from the studs (1) that secure the auxiliary HVAC module to the underside of the vehicle.
  7. Lower the vehicle.
  8. Remove 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) .
  9. Disconnect the electrical connectors from the Auxiliary HVAC module.
    10. Fig 2: View Of Upper Auxiliary Air Duct & Fastener (Tahoe/Yukon)
    GM612462Courtesy of GENERAL MOTORS CORP.
  10. Remove the fastener (5) for the upper auxiliary air duct (1). Carefully slide the duct up, into the headliner, until the bottom edge of the duct is above the air distributor duct.
    11. Fig 3: View Of Auxiliary HVAC Module (Tahoe/Yukon)
    GM612394Courtesy of GENERAL MOTORS CORP.
  11. Remove the fasteners (3) retaining the auxiliary HVAC module to the vehicle.
  12. Remove the auxiliary HVAC module (4) from the vehicle.
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