GM 12572027
Coolant Temperature Sensor

In order to replace the Engine Coolant Temperature (ECT) sensor, we must drain the cooling system to a level below the ECT sensor. Before disconnecting the ECT sensor, remove the ECT sensor from the oil fill tube brackets, with the ECT sensor electric connector. Regardreinstalling the old sensor use Sealant GM P/N 12346004(Canadian 10953480) or an equivalent, put it on the threads. Mount the ECT sensor, and tighten it to 50 N .m (37 lb ft). Then reconnect the ECT sensor electrical connector onto the oil fill tube bracket and connect the ECT sensor electrical connector. Finally, refill the cooling system.

Engine Coolant Temperature Sensor replacement starts with draining the cooling system until it settles below the sensor. After disconnecting the engine wiring harness electrical connector from the ECT sensor remove the sensor. During new sensor installation verify it matches the correct part number and apply GM P/N 12346004 (Canadian P/N 10953480) or equivalent sealant to the sensor threads when reusing the previous sensor. Tighten the ECT sensor until it reaches 20 N.m of torque (15 lb ft). Hook the engine wiring harness electrical connector to the ECT sensor before pumping cooling system fluid into the system.

Use care when handling the coolant sensor, as damage will affect the operation of the fuel control system, and ensure to follow the correct torque specifications to avoid damage.

Reconnect the ECT sensor electrical connector and refill the cooling system.

Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or an equivalent to the threads.