A vehicle's engine coolant termperature sensor plays a significant role in preventing overheating. Here are four signs that it has failed and needs replacing.

A faulty Engine Coolant Temperature (ECT) sensor may lead the turbocharged 2.0L LSY gasoline engine in certain GM vehicles to run hot or even overheat.

Retry the test after the engine has cooled down. Mechanic is testing the battery of a car© ollo/Getty Images open and close car coolant reservior cap© Provided by The Family Handyman ...