GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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

    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. Drain the cooling system below the level of the sensor. Refer to Cooling System Draining and Filling .
  3. Disconnect the ECT sensor electrical connector.

  4. Object Number: 19623  Size: SH
  5. Remove the ECT sensor.

Installation Procedure

  1. Coat the ECT threads (only) with SPO P/N 12346004 sealer or equivalent.

  2. Object Number: 19623  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 sensor to 20 N·m (15 lb ft).

  5. Connect the ECT sensor electrical connector.
  6. Refill the cooling system. Refer to Cooling System Draining and Filling .
  7. Connect the negative battery cable.