Removal Procedure

WARNING: This page is about a different car, the 2005 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.

Loosen the radiator drain plug and drain the coolant 1 liter below the level of the coolant in the coolant surge tank, using a drain pan.
Tighten the drain plug.

Fig 1: Removing/Installing Engine Coolant Temperature Sensor

Courtesy of GENERAL MOTORS CORP.

Disconnect the engine coolant temperature (ECT) sensor harness connector.
Remove the ECT sensor.