A coolant temperature sensor is a device that measures the temperature of the coolant in an engine. This information is used by the engine’s computer to control the engine’s cooling system. A faulty coolant temperature sensor can cause the engine to overheat or run too cold, both of which can lead to serious engine damage.
Checking a coolant temperature sensor is a relatively simple procedure that can be done with a few basic tools. First, locate the sensor. It is typically located near the thermostat housing. Once you have located the sensor, disconnect the electrical connector. Next, start the engine and let it idle. Use a multimeter to measure the voltage between the sensor’s terminals. The voltage should be between 0.5 and 1.0 volts. If the voltage is not within this range, the sensor is faulty and should be replaced.
