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Sensor, Coolant Temperature: Description
 Courtesy of CHRYSLER GROUP, LLC
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- The Engine Coolant Temperature (ECT) sensor (1) is used to sense engine coolant temperature. The sensor protrudes into an engine water jacket and is located on the thermostat housing.
- The ECT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as engine coolant temperature increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sensor increases.