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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 Front 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: Auxiliary Heater Tubes Clip Push Pins Locations
    GM1968232Courtesy of GENERAL MOTORS CORP.
  3. Install the auxiliary A/C tubes clip push pins (1) to vehicle frame locations.
    4. Fig 3: Identifying Auxiliary Heater Tubes Connector Nuts
    GM1968229Courtesy of GENERAL MOTORS CORP.
  4. Install new O-rings with replacement auxiliary A/C tubes. Refer to O-Ring Replacement .
    5. NOTE: Refer to Fastener Notice .
    IMPORTANT: Use a adjustable wrench or equivalent holding tool at tube connections to prevent twisting.
    IMPORTANT: Mandatory torque sequence required for proper connections.
  5. Install the auxiliary A/C tube connection nuts (1) to the intermediate connection point.

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

  6. Install the right assist step if necessary. Refer to Assist Step Replacement (w/WS2, BVX) or Assist Step Replacement (Tubular BVE) .
  7. Lower the vehicle.
    8. Fig 4: Auxiliary Evaporator Hose Nuts, Evaporator Hoses, And O-Rings
    GM1970351Courtesy of GENERAL MOTORS CORP.
  8. Install new O-rings with replacement auxiliary A/C tubes. Refer to O-Ring Replacement .
  9. Install the auxiliary evaporator hose nuts (1) to the main evaporative hose connections.

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

  10. Install the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  11. Recharge the refrigerant to the system. Refer to Refrigerant Recovery and Recharging .
  12. Leak test the fittings of the component using the J 39400-A  .
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