GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Defroster Door Replacement

Removal Procedure
  1. Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages, and Console.
  2. Remove the heater assembly cover retaining screws.
  3. Remove the heater assembly cover.

    4. Object Number: 668959 Size: SH
  4. Disconnect the vacuum hose (1) from the defrost actuator (2).
  5. Depress the clip and remove the defrost actuator (2) from the heater assembly.

    6. Object Number: 691843 Size: SH
  6. Remove the defroster door (2) door from the heater assembly (1).

Installation Procedure

    Object Number: 691843 Size: SH
  1. Install the defroster door (2) to the heater assembly (1).

    2. Object Number: 668959 Size: SH
  2. Install the defrost actuator (2) to the heater assembly.
  3. Connect the vacuum hose (1) to the defrost actuator (2).
  4. Install the heater assembly cover.

    5. 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.

  5. Install the heater assembly cover retaining screws.

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

  6. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages, and Console.