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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 >> Expansion (Orifice) Tube Replacement >> Installation Procedure

Installation Procedure

  1. Uncap or unplug the evaporator tube.
  2. Lubricate the new O-ring using new 525 viscosity refrigerant oil.
    3. Fig 1: Locating Evaporator Tube
    GM703266Courtesy of GENERAL MOTORS CORP.
  3. Install the new O-ring seal.
  4. Install the orifice tube (1) to the evaporator tube (2).
    1. Coat the O-ring seal with 525 viscosity refrigerant oil.
    2. Insert the long screen end of the new orifice (1) into the evaporator tube (2).
    5. NOTE: Refer to Fastener Notice .
  5. Connect the evaporator tube at the fitting.

    Tighten:  Tighten the fitting to 25 N.m (18 lb ft).

  6. Evacuate and recharge the system. Refer to Refrigerant Recovery and Recharging .
  7. Leak test the fittings of the repaired component using J 39400-A  .
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