GM 25037332
Coolant Temperature Sensor

To service the Coolant Temperature Sensor/switch, one can disconnect the negative Battery Cable and take off the air cleaner assembly. Do not try to remove the Radiator Cap or surge tank cap when the motor is hot in order to prevent being scalded by burning liquid and steam. Relieve the pressure in the cooling system and drain the cooling system below the engine coolant temperature (ECT) sensor. Remove the ect sensor connecting harness and the ect sensor. For installation, apply sealer to threads of a new ect sensor (GM P/N 9985253, or equivalent) and install it with 13 n.m (10 lb ft). Connect the ect sensor harness connector, refill the cooling system, install the air cleaner assembly, and finally connect the negative Battery Cable.

To service the Coolant Temperature Sensor/switch, apply first the ignition off, then take out the air cleaner assembly. Drain the cooling system below the ect sensor level, disconnect the ect sensor harness connector, and remove ect sensor. In the process of installation, one should be careful about damaging the coolant sensor for it influences the fuel control system. Apply sealer to the threads of new ect sensor (GM P/N 9985253 or equivalent) and install it, tightening to 13 n.m (115 lb in). Connect ect sensor harness connector, refill the cooling system, and install air cleaner assembly back. Make sure the replacement parts are the correct part number, and the torque specifications are followed to avoid damage.

Refill the cooling system and install the engine cover.

Coat the ECT threads (only) with SPO P/N 12346004 sealer or equivalent.

Coat the ECT sensor threads with sealer GM P/N 12346004 or an equivalent.

Ensure that any required compounds, lubricants, corrosion inhibitors, or sealants are used as specified, as these can impact the final torque and component operation.