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.

Open the hood and find a place to set your multimeter. Open the coolant reservoir or radiator cap to access the coolant. Pro Tip: If you don’t see any coolant in the reservoir, or at the top of ...

Those water pumps have a coolant temperature sensor plumbed into the "hot" passage, measuring the temperature of the coolant just before it exits the pump on the way to the radiator.