GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 TrailBlazer - 4WD 🢒 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. Note: Some screws are hidden under the foam insulation.

  2. Remove the screws to separate the HVAC module assembly halves.

    3. Object Number: 741189 Size: SH
  3. Separate the HVAC module assembly (1).
  4. Remove the evaporator core (2) from the HVAC module assembly (1).
  5. Remove the seal between the HVAC module assembly halves.

Installation Procedure

    Note: If replacing the evaporator core, add the refrigerant oil to the evaporator core. Refer to Refrigerant System Capacities for system capacity information.

  1. Install the seal between the HVAC module assembly halves.

    2. Object Number: 741189 Size: SH
  2. Install the evaporator core (2) to the HVAC module assembly (1).

    3. Note: Ensure that the seal between the 2 case sections is in place.

  3. Assemble the HVAC module assembly.

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

  4. Install the screws to join the HVAC module assembly halves and tighten to 1.9 N·m (17 lb in).
  5. Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.