GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Envoy - 2WD 🢒 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. Important: 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

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

  3. Assemble the HVAC module assembly.

    4. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the screws to join the HVAC module assembly halves.

    5. Tighten
    Tighten the screws to 1.9 N·m (17 lb in).

  5. Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement .