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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 Heater Pipe Replacement >> 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.
IMPORTANT: The replacement A/C and heater pipes are shipped in two sections and spliced together upon installation. Refer to Auxiliary Heater and Air Conditioning Pipe Repair .
  1. Install the auxiliary heater pipes to the vehicle.
    2. Fig 1: View Of Auxiliary Heater Pipes, Clamps & Heater/A/C Tubes Retaining Nut & Stud
    GM691870Courtesy of GENERAL MOTORS CORP.
  2. Install the auxiliary heater pipes (2) to the clamps (5).
    3. NOTE: Refer to Fastener Notice .
  3. Install the heater/A/C tubes retaining nut (4) to the stud (1) at the frame (6).

    Tighten:  Tighten the nut to 7 N.m (62 lb in).

    4. Fig 2: View Of Auxiliary Heater Pipes
    GM612548Courtesy of GENERAL MOTORS CORP.
  4. Install the auxiliary heater pipes (2, 3) to the auxiliary heater core.
  5. Install the right front wheelhouse panel. Refer to Front Wheelhouse Liner Replacement - Right Side .
  6. Install the right rear wheelhouse panel. Refer to Rear Wheelhouse Panel Liner Replacement (RPO X88 Chevrolet, RPO O88 GMC) or Rear Wheelhouse Panel Liner Replacement (RPO HP2) .
  7. Install the vehicle right assist step. Refer to Assist Step Replacement (Z71) or Assist Step Replacement (Power) or Assist Step Replacement (Chevrolet HP2) or Assist Step Replacement (GMC Denali XL) .
    8. Fig 3: View Of Auxiliary Heater Pipes At Heater Inlet & Outlet Tees
    GM612571Courtesy of GENERAL MOTORS CORP.
  8. Install the auxiliary heater pipes (1, 2) to the heater inlet and outlet tees (3, 4).
    9. Fig 4: Connecting Quick-Connect Fittings
    GM21855Courtesy of GENERAL MOTORS CORP.
  9. Connect the outlet heater hose to the heater core.
  10. Connect the inlet heater hose to the heater core.
  11. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) .
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