Repair Procedures: Removal

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

Fig 1: Disconnecting Engine Coolant Temperature Sensor Connector
Courtesy of KIA MOTORS AMERICA, INC.
Remove the Engine coolant temperature sensor.
Engine Coolant Temperature Sensor Mounting:

29.4 - 39.2 N.m (3.0 - 4.0 kgf.m, 21.7 - 28.9 lb.ft)