Malibu L4-2.2L VIN F (2005)
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT
REMOVAL PROCEDURE
1. Turn the ignition OFF.
2. Disconnect the ECT sensor harness connector.
IMPORTANT: Engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor.
3. Remove the ECT (1).
INSTALLATION PROCEDURE
1. Apply the thread sealant GM P/N 21485227, LOCTITE 242(R) Threadlocker or equivalent to the sensor threads.
IMPORTANT: Tap out the sensor mounting hole in the engine head to remove any thread sealant residue. Clean any sealant residue from the old
sensor and apply the RTV sealant to threads if old the sensor is going to be reused.
2. Install the ECT sensor (1).
NOTE: Refer to Fastener Notice in Service Precautions.
Tighten the ECT sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
4. Fill the engine coolant to the proper level.
