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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 >> O-Ring Replacement >> Installation Procedure

Installation Procedure

  1. Inspect the new O-ring seal for any sign or cracks, cuts, or damage. Replace if necessary.
  2. Remove the cap or tape from the A/C refrigerant components.
  3. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant components.
    4. IMPORTANT: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the new O-ring seal to enter the refrigerant system.
  4. Lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil.
    5. IMPORTANT: DO NOT reuse O-ring seals.
  5. Carefully slide the new O-ring seal onto the A/C refrigerant component.
    6. Fig 1: Identifying Proper Seating Of A/C Refrigerant O-Ring
    GM662315Courtesy of GENERAL MOTORS CORP.
  6. The O-ring seal must be fully seated.
    7. Fig 2: Disassembling/Reassembling A/C Line Fittings
    GM297225Courtesy of GENERAL MOTORS CORP.
  7. Assemble the A/C components.

    Refer to the appropriate repair procedure.

    • For compression style fittings use a back up wrench on the fitting (2) and tighten the fitting nut (1) to specification.
    • For banjo style fittings install the bolt retaining the banjo type fitting and tighten to specification.
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