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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Air Conditioning (A/C) High Pressure Switch Replacement (HU6 Only) >> Installation Procedure

Installation Procedure

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Important  : If you reinstall an existing control switch in the compressor, use a new O-ring and a new retainer ring. An O-ring and a retainer ring is included in a new switch kit.

  1. Lubricate the new O-ring using new 525 viscosity refrigerant oil.
  2. Install the new O-ring into the groove in the switch cavity.
  3. Lubricate the control switch housing using new 525 viscosity refrigerant oil.
  4. Install the switch (2) into the switch cavity until the switch bottoms in the cavity.
  5. Install the A/C high pressure switch snap ring using the J-5403  . Ensure that the high point of the curved sides is adjacent to the switch housing. Ensure that the snap ring is properly seated in the switch cavity retaining groove.
  6. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  7. Leak test the fittings of the components using the J-39400-A  .
    Fig 1: Installing A/C High Pressure Switch
    G01216934Courtesy of GENERAL MOTORS CORP.