GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 69919  Size: SH
  1. Drain the coolant. Refer to Cooling System Draining and Filling .
  2. 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.

  3. Disconnect the negative battery cable.
  4. Remove the air intake duct. Refer to Air Cleaner Inlet Duct Replacement
  5. Disconnect the radiator hose.

  6. Object Number: 69948  Size: SH
  7. Remove the thermostat housing.

  8. Object Number: 69947  Size: SH
  9. Remove the thermostat.
  10. Clean all sealing surfaces.

Installation Procedure


    Object Number: 69947  Size: SH
  1. Install the thermostat.
  2. Install the thermostat housing using a new gasket.

  3. Object Number: 69948  Size: SH
  4. Install the thermostat housing bolts.
  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.

    Tighten
    Tighten the thermostat housing bolts to 20 N·m (15 lb ft).


    Object Number: 69919  Size: SH
  6. Connect the radiator hose.
  7. Install the air intake duct. Refer to Air Cleaner Inlet Duct Replacement
  8. Refill the coolant. Refer to Cooling System Draining and Filling .
  9. Connect the negative battery cable.
  10. Start the engine.
  11. Check for leaks.