Installation Procedure

Fig 1: Removing & Installing Engine Coolant Temperature Sensor

Courtesy of GENERAL MOTORS CORP.

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.

Apply the thread sealant GM P/N 21485227, LOCTITE 242® Threadlocker or equivalent to the sensor threads.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the ECT sensor (1).
Tighten: Tighten the ECT sensor to 20 N.m (15 lb ft).
Connect the ECT sensor harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
Fill the engine coolant to the proper level.