GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement.

  2. Object Number: 802735  Size: SH
  3. Remove the insulation (1) from the thermal expansion valve (TXV). Discard the used insulation.

  4. Object Number: 817514  Size: SH
  5. Remove the HVAC line clamp screw.

  6. Object Number: 817516  Size: SH
  7. Remove the HVAC line clamp.

  8. Object Number: 802742  Size: SH
  9. Remove the bolts (1) that secure the TXV to the evaporator.

  10. Object Number: 802746  Size: SH
  11. Remove the TXV line bracket.

  12. Object Number: 802747  Size: SH
  13. Remove the TXV from the evaporator core.
  14. Separate the TXV from the A/C lines by pulling straight out.
  15. Remove the TXV.

Installation Procedure

  1. Lubricate the O-rings. Refer to O-Ring Replacement.
  2. Install the A/C lines into the TXV.

  3. Object Number: 802747  Size: SH
  4. Carefully slide the TXV onto the evaporator core until seated.

  5. Object Number: 802746  Size: SH
  6. Install the TXV line bracket.
  7. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 802742  Size: SH
  8. Install the bolts (1) that secure the TXV to the evaporator.
  9. Tighten
    Tighten the bolts to 3.5 N·m (31 lb in).


    Object Number: 817516  Size: SH
  10. Install the HVAC line clamp.

  11. Object Number: 817514  Size: SH
  12. Install the HVAC line clamp screw.
  13. Tighten
    Tighten the screw to 1 N·m (8 lb in).

  14. Install the HVAC module. Refer to HVAC Module Assembly Replacement.

  15. Object Number: 802735  Size: SH
  16. Install new insulation (1) onto the lines and TXV.