GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 50967  Size: SH
  1. Turn OFF the ignition.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  4. Lower the vehicle.
  5. Disconnect the electrical connector from the ECT sensor.

  6. Object Number: 50974  Size: SH

    Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

  7. Remove the ECT sensor.

Installation Procedure

    Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

  1. Coat the Engine Coolant Temperature (ECT) sensor threads with sealer P/N 12346004 or the equivalent.

  2. Object Number: 50974  Size: SH

    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.

  3. Install the ECT sensor.
  4. Tighten
    Tighten the ECT sensor to 23 N·m (17 lb ft).


    Object Number: 50967  Size: SH
  5. Connect the ECT sensor electrical connector.
  6. Refill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  7. Start the engine and inspect for leaks.
  8. Re-inspect the engine coolant level.