GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 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. Remove the screws that secure the recirculation housing to the HVAC module assembly.

    3. Object Number: 1263138 Size: SH
  3. Remove the recirculation housing from the HVAC module assembly.
  4. Remove the screws that secure the mode actuator to the HVAC module assembly.
  5. Remove the mode actuator from the HVAC module assembly.
  6. Remove the bolts that secure the TXV to the evaporator core.
  7. Remove the TXV from the evaporator core.
  8. Discard the old seal rings from the evaporator core.
  9. Remove the screws that secure HVAC module assembly upper case to the HVAC module assembly lower case.
  10. Remove the heat stakes that secure the HVAC module assembly upper case to the HVAC module lower case using a small chisel.

    11. Object Number: 295357 Size: SH
  11. Separate the HVAC module assembly case (1).

    12. Object Number: 295362 Size: SH
  12. Remove the evaporator core.

Installation Procedure
  1. If replacing the evaporator, add refrigerant oil to the evaporator. Refer to Refrigerant System Capacities for system capacity information.

    2. Object Number: 144106 Size: SH
  2. Install a new side seal to the evaporator core.

    3. Object Number: 144104 Size: SH
  3. Install a new upper seal to the evaporator core.

    4. Object Number: 144107 Size: SH
  4. Install 2 new lower seals to the evaporator core.

    5. Object Number: 295362 Size: SH
  5. Install the evaporator core into the HVAC module assembly lower case.
  6. From the inside of the upper case, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit.

    7. Object Number: 295357 Size: SH
  7. Align and attach the upper and lower HVAC module assembly case (1).

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

  8. Install the removed screws that secure the HVAC module assembly upper case to the HVAC module assembly lower case to their original position.

    9. Tighten the screws to 1.5 N·m (13 lb in).

  9. Install new screws that will secure the HVAC module assembly upper case to the HVAC module assembly lower case in the predrilled holes adjacent to the heat stakes.

    10. Tighten the screws to 1.5 N·m (13 lb in).

  10. Install the mode actuator.
  11. Install the screws that secure the mode actuator to the HVAC module assembly.

    12. Tighten the screws to 1.5 N·m (13 lb in).


    Object Number: 1263138 Size: SH
  12. Install the recirculation housing to the HVAC module assembly.
  13. Install the screws that secure the recirculation housing to the HVAC module assembly.

    14. Tighten the screws to 1.5 N·m (13 lb in).

  14. Install new sealing washers on the evaporator core. Refer to Sealing Washer Replacement.
  15. Install the TXV to the evaporator core.
  16. Install the bolts that secure the TXV to evaporator core and tighten the bolts to 7 N·m (62 lb in).
  17. Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.