Repair procedures: Removal

Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Disconnect the engine coolant temperature sensor connector (A).
Remove the sensor (B).

Fig 1: Engine Coolant Temperature Sensor And Connector Component Location
Courtesy of KIA MOTORS AMERICA, INC.

CAUTION: Note that engine coolant may be flowed out from the water temperature control assembly when removing the sensor.
Supplement the engine coolant (Refer to REFILLING AND BLEEDING .