GM Service Manual Online
For 1990-2009 cars only

Compressor Pressure Relief Valve Replacement LX9

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
  2. Remove the A/C Compressor. Refer to Air Conditioning Compressor Replacement.

  3. Object Number: 903621  Size: SH
  4. Remove the high pressure relief valve from the A/C compressor.

Installation Procedure

  1. Lubricate the high pressure relief valve O-ring. Refer to O-Ring Replacement.
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 903621  Size: SH
  3. Install the high pressure relief valve to the A/C compressor.
  4. Tighten
    Tighten the valve to 12 N·m (9 lb ft).

  5. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement.
  6. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
  7. Leak test the fittings of the component using J 39400-A .

Compressor Pressure Relief Valve Replacement LY7

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
  2. Remove the A/C Compressor. Refer to Air Conditioning Compressor Replacement.

  3. Object Number: 1644880  Size: SH
  4. Remove the high pressure relief valve from the A/C compressor.

Installation Procedure

  1. Lubricate the high pressure relief valve O-ring. Refer to O-Ring Replacement.
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1644880  Size: SH
  3. Install the high pressure relief valve to the A/C compressor.
  4. Tighten
    Tighten the valve to 12 N·m (9 lb ft).

  5. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement.
  6. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
  7. Leak test the fittings of the component using J 39400-A .