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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating, Ventilation, And Air Conditioning >> Repair Instructions >> Auxiliary Heater Pipe Replacement - Rear >> Installation Procedure

Installation Procedure

IMPORTANT: The replacement A/C and heater pipes are shipped in front and rear sections.
    Fig 1: Identifying Auxiliary Heater Tubes Clip
    GM1968221Courtesy of GENERAL MOTORS CORP.
  1. Install the auxiliary heater tubes (3) to the retaining clips (2).
  2. Install the auxiliary heater tubes (3) to the vehicle.
    3. Fig 2: Identifying Heater Tubes Retaining Push Pins, Retaining Bolt, And Auxiliary Heater Tubes
    GM1968226Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  3. Install the auxiliary heater tube nut (2).

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

  4. Install the auxiliary heater tube push pins (1).
    5. Fig 3: Auxiliary Heater Tubes
    GM1968254Courtesy of GENERAL MOTORS CORP.
  5. Install the auxiliary heater tubes (1) to the auxiliary HVAC module.
    6. Fig 4: Identifying Auxiliary Heater Tubes Connector Nuts
    GM1968229Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Use a adjustable wrench or equivalent holding tool at tube connections to prevent twisting.
    IMPORTANT: Mandatory torque sequence required for proper connections.
  6. Install the auxiliary heater tube connection nuts (2) to the intermediate connection point.

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

  7. Install the rear wheelhouse liner. Refer to Wheelhouse Panel Replacement .
  8. Install the right assist step if necessary. Refer to Assist Step Replacement (w/WS2, BVX) or Assist Step Replacement (Tubular BVE) .
  9. Lower the vehicle.
  10. Fill the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac-N-Fill) .
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