GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Remove the auxiliary HVAC module. Refer to Auxiliary HVAC Module Replacement .

  2. Object Number: 2074318  Size: SH
  3. Remove the screws from the lower HVAC case.
  4. Seperate the lower case halves.

  5. Object Number: 300828  Size: SH
  6. Remove the screws from the auxiliary HVAC module.
  7. Separate the case halves.
  8. Remove the evaporator core seal.
  9. Remove the evaporator core from the auxiliary HVAC module.
  10. Inspect the gaskets and the seals for damage.
  11. Replace the gaskets and the seals.

Installation Procedure

  1. Add refrigerant oil to the evaporator. Refer to Refrigerant System Capacities .

  2. Object Number: 300828  Size: SH
  3. Install the evaporator core to the auxiliary HVAC module.
  4. Install the evaporator core seal.
  5. Reassemble the case halves.
  6. Notice: Refer to Fastener Notice in the Preface section.

  7. Install the auxiliary HVAC module screws.
  8. Tighten
    Tighten the screws to 2 N·m (16 lb in).

  9. Reassemble the lower HVAC halves.
  10. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 2074318  Size: SH
  11. Install the lower HVAC case screws.
  12. Tighten
    Tighten the screws to 2 N·m (16 lb in).

  13. Install the auxiliary HVAC module. Refer to Auxiliary HVAC Module Replacement .
  14. Leak test the fittings using the J 39400-A .