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.


    Object Number: 15986  Size: SH
  1. Turn OFF the ignition.
  2. Drain the coolant below the level of the ECT sensor. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Disconnect the sensor electrical connector.
  4. Carefully remove the ECT sensor.

Installation Procedure

    Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

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


    Object Number: 15986  Size: SH
  1. Coat the threads with sealer GM P/N 9985253 or equivalent.
  2. Carefully install the ECT sensor.
  3. Tighten
    Tighten the ECT sensor to 20 N·m (15 lb ft).

  4. Connect the ECT electrical connector to the sensor.
  5. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.