Coolant Temperature Sensor/Switch (For Computer): Service and Repair

Engine Coolant Temperature Sensor Replacement

Removal Procedure

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




1. Turn OFF the ignition.
2. Drain the coolant system to below the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System (2.0L (LSJ)) Draining and Filling Cooling System (2.2L (L61), 2.4L (LE5)) Draining and Filling Cooling System (GE 47716 Fill).
3. Disconnect the engine coolant temperature ECT sensor electrical connector.
4. Carefully remove the ECT sensor (1).

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.




1. If you are reinstalling the original sensor, or if you are installing a new sensor without a sealer, coat the threads with sealer GM P/N 21485227, LOCTITE(R) 242 Threadlocker or an equivalent.

Notice: Refer to Fastener Notice.

2. Install the ECT sensor (1).

Tighten the ECT sensor to 22 N.m (16 lb ft).

3. Connect the ECT sensor electrical connector.
4. Refill the engine coolant system. Refer to Draining and Filling Cooling System (2.0L (LSJ)) Draining and Filling Cooling System (2.2L (L61), 2.4L (LE5)) Draining and Filling Cooling System (GE 47716 Fill).