GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Air Conditioning Evaporator Core Replacement

Removal Procedure
  1. Remove the HVAC module assembly. Refer to HVAC Module Assembly Replacement.

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

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

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

    5. Object Number: 802742 Size: SH
  5. Remove the TXV to evaporator bolts (1).

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

    7. Object Number: 802747 Size: SH
  7. Remove the TXV from the evaporator core.
  8. Separate the TXV from the A/C lines by pulling straight out.
  9. Remove the TXV.
  10. Remove the screws that hold the case together.

    11. Object Number: 756307 Size: SH
  11. Remove the clips that hold the case together.

    12. Object Number: 817507 Size: SH
  12. Disconnect the thermistor electrical connector.

    13. Object Number: 756343 Size: SH
  13. Separate the HVAC module.

    14. Object Number: 802751 Size: SH
  14. Remove the thermistor from the evaporator core.

    15. Object Number: 802748 Size: SH
  15. Remove the evaporator core.

Installation Procedure
  1. Add refrigerant oil. Refer to Refrigerant System Capacities.
  2. Install new evaporator core seals to evaporator.

    3. Object Number: 802748 Size: SH
  3. Install the evaporator core.

    4. Object Number: 802751 Size: SH
  4. Install the thermistor to the evaporator into the same position as removed.

    5. Object Number: 756343 Size: SH
  5. Slide the HVAC module together.

    6. Caution: Refer to Fastener Caution in the Preface section.

  6. Install the screws that hold the case together and tighten to 1 N·m (8 lb in).
  7. Install the clips that hold the case together.

    8. Object Number: 817507 Size: SH
  8. Connect the thermistor electrical connector.
  9. Lube A/C lines with refrigerant oil before installing. Refer to O-Ring Replacement.
  10. Install the A/C lines into the TXV.

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

    12. Object Number: 802746 Size: SH
  12. Install the TXV line bracket.

    13. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 802742 Size: SH
  13. Install the TXV to evaporator bolts (1) and tighten to 3.5 N·m  (31 lb in).

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

    15. Object Number: 817514 Size: SH
  15. Install the HVAC line clamp screw and tighten to 1 N·m  (8 lb in).

    16. Object Number: 802735 Size: SH
  16. Install the insulation (1) onto the lines and TXV.
  17. Install the HVAC module. Refer to HVAC Module Assembly Replacement.