Repair Procedures: Removal

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

Fig 1: Locating Engine Coolant Temperature Sensor Connector
Courtesy of HYUNDAI MOTOR AMERICA
Supplement the engine coolant.
(Refer to Engine Mechanical System - "COOLING SYSTEM ")