Installation Procedure

IMPORTANT: Tap out sensor mounting hole in engine head to remove any thread sealant residue. Clean any sealant residue from old sensor and apply RTV sealant to threads if old sensor is going to be reused.

Apply thread sealant SA P/N 21485277 Loctite 242® Threadlocker (or equivalent) to sensor threads.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Fig 1: View Of Engine Coolant Temperature (ECT) Sensor

Courtesy of GENERAL MOTORS CORP.

Install the ECT sensor with a new O-ring.
Tighten: Tighten the engine coolant temperature sensor to 18 N.m (13 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 engine coolant to proper level. Refer to Draining and Filling Cooling System in Engine Cooling.