Also referred to as an ECT sensor, a coolant temperature sensor is one of a vehicle's more vital safeguards against overheating as it directly gauges the temp of an automobile's coolant.

Many engine designs have the coolant temperature sensor screw into the thermostat ... the thermostat housing. A temperature sensor that is sending the wrong information to the car's computer can cause ...

The coolant light glowing blue when you start your car is a warning that the engine isn't yet up to its optimal running temperature ... still trigger the system's sensor," says John Ibbotson ...