Coolant Temperature Sending Unit

NOTE: Coolant temperature sensor has 3 terminals. When performing resistance test, measure resistance at center terminal.

Partially drain cooling system. Disconnect coolant temperature sending unit harness connector. Remove sending unit from vehicle. Warm sending unit in water. Ensure resistance decreases with increase of temperature. SeeFig 1 . Check sending unit resistance as temperature changes. See COOLANT TEMPERATURE SENDING UNIT RESISTANCE . If resistance is not as specified, replace coolant temperature sending unit.

COOLANT TEMPERATURE SENDING UNIT RESISTANCE

Water Temperature °F (°C)	Ohms
122 (50)	190-260
176 (80)	55-65
212 (100)	25-35

Fig 1: Testing Coolant Temperature Sending Unit (Typical)

Courtesy of SUZUKI OF AMERICA CORP.