Engine Coolant Temperature Sensor: Removal

Disconnect the ground cable from battery.

Fig 1: Connecting/Disconnecting Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.
Drain engine coolant. Refer to DRAINING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant.
Disconnect the connector (A) from the engine coolant temperature sensor, and remove the engine coolant temperature sensor.

Fig 2: Locating Engine Coolant Temperature Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.