GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC Sierra Denali 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Heater Door Replacement

Removal Procedure
  1. Remove the heater/vent module. Refer to Heater/Vent Module Replacement .

    2. Object Number: 668357 Size: SH
  2. Remove the heater/vent module screws.
  3. Separate the heater/vent module.
  4. Remove the mode actuator (3).
  5. Remove the mode actuator cam assembly (4).
  6. Remove the heater door cam assembly (5).
  7. Remove the heater door (6).

Installation Procedure

    Object Number: 668357 Size: SH
  1. Remove the heater door (6).
  2. Install the heater door cam assembly (5).
  3. Install the mode actuator cam assembly (4).
  4. Install the mode actuator (3).
  5. Install the heater/vent module halves.

    6. 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.

  6. Install the heater/vent module screws.

    7. Tighten
    Tighten the screws to 1.6 N·m (14 lb in).

  7. Install the heater/vent module. Refer to Heater/Vent Module Replacement .