Removal Procedure

WARNING: This page is about a different car, the 2004 Saturn Ion 3, 2004 Saturn Ion 2, and 2004 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.

Turn OFF the ignition.
Drain the coolant system to below the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System (2.2L (L61)) or Draining and Filling Cooling System (2.0L (LSJ)) in Engine Cooling.
Disconnect the engine coolant temperature ECT sensor electrical connector.
Carefully remove the ECT sensor.

Fig 1: View Of ECT Sensor

Courtesy of GENERAL MOTORS CORP.