GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 G8 🢒 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: 2040981 Size: SH
  2. Disconnect the main mode actuator electrical connector (1).
  3. Disconnect the air mix actuator electrical connector (2).
  4. Disconnect the rear mode actuator electrical connector (3).
  5. Detach the wiring harness (5) from the HVAC module assembly (4).

    6. Object Number: 2040983 Size: SH
  6. Detach the wiring harness (1) from the HVAC module assembly (2).

    7. Object Number: 2040995 Size: SH

    Important: Do not damage the foam seal (1).

  7. Remove the foam seal (1) from the HVAC module assembly (2).

    8. Object Number: 2040999 Size: SH
  8. Remove the TX valve positioning bracket to the HVAC module assembly retaining screws (2).
  9. Remove TX valve positioning bracket (3) from the HVAC module assembly (1).

    10. Object Number: 2041000 Size: SH

    Important: Unclip the upper plastic retaining cover (1) to remove.

  10. Remove the upper retaining plastic cover (1) from HVAC module assembly (2).
  11. Remove the evaporator pipe assembly to evaporator retaining bolts (4).
  12. Remove the evaporator pipe assembly (5) from the evaporator (3).

    13. Object Number: 2041004 Size: SH
  13. Remove the HVAC module assembly retaining clips (1) from the HVAC module assembly (2).

    14. Object Number: 2041006 Size: SH
  14. Remove the left side HVAC module assembly housing to right side HVAC module assembly housing retaining screws (1).

    15. Object Number: 2041009 Size: SH

    Important: Make sure the air distribution flaps and linkages are not damaged on removal, otherwise incorrect HVAC operation may result.

  15. Separate the left side HVAC module assembly housing (1) from the right side HVAC module assembly housing (2).

    16. Object Number: 2041011 Size: SH

    Important: Use a suitable tool to remove the evaporator temperature sensor (3) from the evaporator (2).

  16. Remove the evaporator temperature sensor (3) from the evaporator (2).

    17. Important: Remove the evaporator (2) by sliding it out of the HVAC module assembly (1).

  17. Remove the evaporator (2) from the HVAC module assembly (1).

Installation Procedure

    Object Number: 2041011 Size: SH

    Important: DO NOT force the evaporator (2) into the HVAC module assembly (1). Damage to the evaporator temperature sensor (3) can occur.

  1. Install the evaporator (2) to the HVAC module assembly (1).

    2. Important: Install the evaporator temperature sensor (3) to the evaporator (2) 22.2 mm (7/8 in) from the side of the evaporator and 50 mm (2 in) from the bottom of the evaporator.

  2. Install the evaporator temperature sensor (3) to the evaporator (2).

    3. Object Number: 2041009 Size: SH

    Important: Make sure the air distribution flaps and linkages are not damaged on removal, otherwise incorrect HVAC operation may result.

  3. Install the left side HVAC module assembly housing (1) to the right side HVAC module assembly housing (2).

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 2041006 Size: SH
  4. Install the left side HVAC module assembly housing to right side HVAC module assembly housing retaining screws (1).

    5. Tighten
    Tighten the screws to 1 N·m (8 lb in).


    Object Number: 2041004 Size: SH
  5. Install the HVAC module assembly retaining clips (1) to the HVAC module assembly (2).

    6. Object Number: 2041013 Size: SH
  6. Install NEW O-rings (1) to the evaporator (2). Refer to O-Ring Replacement.

    7. Object Number: 2041000 Size: SH
  7. Install the evaporator pipe assembly (5) to the evaporator (3).
  8. Install the evaporator pipe assembly to evaporator retaining bolts (4)

    9. Tighten
    Tighten the bolts to 3.5 N·m  (31 lb in).

  9. Install the upper retaining plastic cover (1) to the HVAC module assembly (2).

    10. Object Number: 2040999 Size: SH
  10. Install the TX valve positioning bracket (3) to the HVAC module assembly (1).
  11. Install the TX valve positioning bracket to HVAC module assembly retaining screws (2).

    12. Tighten
    Tighten the screws to 1 N·m (9 lb in).


    Object Number: 2040995 Size: SH

    Important: Using a commercially available adhesive install the foam seal (1) to the HVAC module assembly (2)

  12. Install the foam seal (1) to the HVAC module assembly (2).

    13. Object Number: 2040983 Size: SH
  13. Install the wiring harness (1) to the HVAC module assembly (2).

    14. Object Number: 2040981 Size: SH
  14. Install the wiring harness (5) to the HVAC module assembly (4).
  15. Connect the main mode actuator electrical connector (1).
  16. Connect the air mix actuator electrical connector (2).
  17. Connect the rear mode actuator electrical connector (3).
  18. Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.