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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 Air Conditioning Evaporator Rear Tube Replacement >> 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 A/C evaporator tubes (3) to the retaining clips (2).
  2. Install the auxiliary A/C evaporator 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 - A/C tube nut (2).

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

  4. Install the auxiliary heater - A/C tube push pins (1).
    5. Fig 3: Identifying Retaining Nut And The Auxiliary A/C Evaporator Tubes
    GM1968248Courtesy of GENERAL MOTORS CORP.
  5. Install the auxiliary heater - A/C tubes (3) and the retaining nuts (1) to the auxiliary HVAC module.

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

  6. Install new O-rings with replacement auxiliary A/C tubes. Refer to O-Ring Replacement .
    7. Fig 4: Identifying Auxiliary Heater Tubes Connector Nuts
    GM1968229Courtesy of GENERAL MOTORS CORP.
  7. Install new O-rings with replacement auxiliary A/C tubes. Refer to O-Ring Replacement .
    8. IMPORTANT: Use a adjustable wrench or equivalent holding tool at tube connections to prevent twisting.
    IMPORTANT: Mandatory torque sequence required for proper connections.
  8. Install the auxiliary heater - A/C tube connection nuts (1) to the intermediate connection point.

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

  9. Install the auxiliary heater tubes connector nuts (2) if necessary.

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

  10. Install the rear wheelhouse liner. Refer to Wheelhouse Panel Replacement .
  11. Install the right assist step if necessary. Refer to Assist Step Replacement (w/WS2, BVX) or Assist Step Replacement (Tubular BVE) .
  12. Lower the vehicle.
  13. Fill the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac-N-Fill) .
  14. Recharge the refrigerant to the system. Refer to Refrigerant Recovery and Recharging .
  15. Leak test the fittings of the component using the J 39400-A  .
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