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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 447 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> Auxiliary Heater Pipe Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Quick Connect Fitting Release Tabs (Plastic Collar)
    GM12777Courtesy of GENERAL MOTORS COMPANY
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) .
  2. Squeeze the plastic retainer tabs on the inlet hose.
    3. Fig 2: View Of Pulling Connection Apart (Plastic Collar)
    GM12778Courtesy of GENERAL MOTORS COMPANY
  3. Pull the connection apart.
    4. Fig 3: View Of Quick Connect Fitting Release Tabs (Plastic Collar)
    GM12777Courtesy of GENERAL MOTORS COMPANY
  4. Squeeze the plastic retainer tabs on the outlet hose.
    5. Fig 4: View Of Pulling Connection Apart (Plastic Collar)
    GM12778Courtesy of GENERAL MOTORS COMPANY
  5. Pull the connection apart.
    6. Fig 5: View Of Auxiliary Heater Pipes At Heater Inlet & Outlet Tees
    GM612571Courtesy of GENERAL MOTORS COMPANY
  6. Remove the auxiliary heater pipes (1, 2) from the heater inlet and outlet tees (3, 4) at the HVAC module.
  7. Remove the vehicle right assist step. Refer to Assist Step Replacement (GMC Denali XL) , Assist Step Replacement (Chevrolet HP2) , Assist Step Replacement (Power BRS) , Assist Step Replacement (Z71) .

    Remove both of the right tires. Refer to Tire and Wheel Removal and Installation .

  8. Remove the right rear wheelhouse panel. Refer to Rear Wheelhouse Panel Liner Replacement (RPO X88 Chevrolet, RPO O88 GMC) , Rear Wheelhouse Panel Liner Replacement (RPO HP2) .
  9. Remove the right front wheelhouse panel. Refer to Front Wheelhouse Liner Replacement - Right Side .
    10. Fig 6: View Of Auxiliary Heater Pipes
    GM612548Courtesy of GENERAL MOTORS COMPANY
  10. Remove the auxiliary heater pipes (2, 3) from the auxiliary heater core.
    11. Fig 7: View Of Auxiliary Heater Pipes, Clamps & Heater/A/C Tubes Retaining Nut & Stud
    GM691870Courtesy of GENERAL MOTORS COMPANY
  11. Remove the heater/A/C tubes retaining nut (4) from the stud (1) at the frame (6).
  12. Remove the auxiliary heater pipes (2) from the clamps (5).
  13. Remove the auxiliary heater pipes from the vehicle.
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