GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the instrument panel pad. Refer to Instrument Panel Trim Pad Replacement in Instrument Panel, Gauges and Console.
  3. Remove the air distribution duct. Refer to Air Distributor Duct Replacement .
  4. Remove the valve housing cover from the module.
  5. Remove the defrost valve actuator link from the defrost valve.
  6. Remove the defrost valve from the module.

Installation Procedure

  1. Install the defrost valve to the module.
  2. Install the defrost valve actuator link to the defrost valve.
  3. 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 valve housing cover.
  5. Tighten
    Tighten the screws to 1 N·m (9 lb in).

  6. Install the air duct.
  7. Install the instrument panel pad. Refer to Instrument Panel Trim Pad Replacement in Instrument Panel, Gauges and Console.
  8. Connect the negative battery cable.
  9. Tighten
    Tighten the bolt to 16 N·m (12 lb ft).