A coolant temperature sensor is a vital part of an automobile engine’s cooling system. Without a properly operating cooling system, the engine will run hot which will cause the engine to operate inefficiently and may result in serious damage.

Coolant Sensor Purpose

The coolant sensor is basically a thermometer that reports the internal engine temperature to the engine’s control computer. Information from the sensor is used by the computer to make adjustments to the fuel injection system, ignition timing and other engine components.