GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Remove the left Front Fender Upper diagonal brace. Refer to Front End Sheet Metal Diagonal Brace Replacement in Body Front End.
  3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L or Air Cleaner Assembly Replacement in Engine Controls - 3.8L.
  4. Remove the vacuum brake booster. Refer to Power Vacuum Brake Booster Replacement in Hydraulic Brakes.
  5. Remove the accumulator tube clip.

  6. Object Number: 491758  Size: SH
  7. Disconnect the evaporator inlet tube nut from the condenser tube.
  8. Disconnect the evaporator inlet tube from the condenser tube.

  9. Object Number: 532742  Size: SH
  10. Remove the evaporator outlet tube to evaporator block fitting bolt.
  11. Important: Use care when removing the evaporator tube.

  12. Disconnect the evaporator inlet tube from the evaporator.
  13. Remove the O-ring and discard.

Installation Procedure

    Important: The new O-ring seal must be coated with mineral base 525 viscosity refrigerant oil.

  1. Install the new O-ring seals on to the evaporator tube. Refer to O-Ring Replacement .
  2. Connect the evaporator inlet tube to the condenser tube.

  3. Object Number: 532742  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Connect the evaporator inlet tube to the evaporator.
  5. Tighten
    Tighten the evaporator outlet tube to evaporator block fitting bolt to 16 N·m (12 lb ft).


    Object Number: 491758  Size: SH
  6. Tighten the evaporator inlet tube nut.
  7. Tighten
    Tighten the evaporator inlet tube nut to 27 N·m (20 lb ft).

  8. Install the accumulator tube clip.
  9. Install the vacuum brake booster. Refer to Power Vacuum Brake Booster Replacement in Hydraulic Brakes.
  10. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L or Air Cleaner Assembly Replacement in Engine Controls - 3.8L.
  11. Install the left Front Fender Upper diagonal brace. Refer to Front End Sheet Metal Diagonal Brace Replacement in Body Front End.
  12. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  13. Leak test the fittings of the component using J 39400-A .