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 lower quarter trim panel. Refer to Rear Quarter Lower Trim Panel Replacement in Interior Trim.
  3. Remove the foam wrap from the auxiliary TXV.

  4. Object Number: 791031  Size: SH
  5. Remove the auxiliary TXV line clamp screws.
  6. Remove the auxiliary TXV line clamp from the HVAC module assembly.

  7. Object Number: 791034  Size: SH
  8. Remove the bolt from the auxiliary TXV line block fitting.
  9. Remove the A/C lines from the auxiliary TXV.
  10. Important: Cap or tape the open A/C refrigerant lines immediately to prevent contamination of the refrigerant system.

  11. Cap or tape the A/C lines.

  12. Object Number: 791035  Size: SH
  13. Remove the auxiliary TXV to evaporator core bolts.
  14. Remove the auxiliary TXV from the evaporator core.
  15. Cap or tape off the evaporator core lines.
  16. Remove and discard the sealing washers.

Installation Procedure

  1. Remove the cap or tape from the evaporator lines.
  2. Using a lint-free clean, dry cloth, carefully clean the sealing surface of the evaporator lines and the TXV.
  3. Important: Flat washer type seals do not require lubrication.

  4. Carefully slide the new sealing washers onto the evaporator lines until seated.

  5. Object Number: 791035  Size: SH
  6. Install the auxiliary TXV to the evaporator core.
  7. 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.

  8. Install the auxiliary TXV to the evaporator core mounting bolts.
  9. Tighten
    Tighten the bolts to 3.5 N·m (31 lb in).

  10. Remove the cap or tape from the A/C lines.
  11. Using a lint-free clean, dry cloth, carefully clean the sealing surface of the A/C lines and the TXV.
  12. Carefully slide the new sealing washers onto the A/C line until seated.
  13. Install the A/C lines to the auxiliary TXV.

  14. Object Number: 791034  Size: SH
  15. Install the auxiliary TXV line block fitting retaining bolt.
  16. Tighten
    Tighten the nut to 11 N·m (97 lb in).


    Object Number: 791031  Size: SH
  17. Install the auxiliary TXV line clamp to the HVAC module assembly.
  18. Install the auxiliary TXV line clamp screw.
  19. Tighten
    Tighten the screw to 1.6 N·m (14 lb in).

  20. Install a new foam wrap to the auxiliary TXV.
  21. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  22. Leak test the fittings of the component using J 39400-A .
  23. Install the left lower quarter trim panel. Refer to Rear Quarter Lower Trim Panel Replacement in Interior Trim.