How to test a car thermostat?

Edit Article How to Tell if Your Car's Thermostat Is Stuck Closed. Three Methods: Testing at Home Testing On-the-Road Using the Squeeze Test Community Q&A The thermostat in your car is responsible for controlling the amount of coolant released into your engine. read more

Heat the water to the temperature stamped on the thermostat (this temperature can range from 180 to 212F depending on the type of thermostat), making sure to monitor the water with a meat thermometer. Step 3: Place the thermostat in the water. Using needlenose pliers, hold on to the thermostat and place it in the heated water. read more

You can find your car's thermostat by starting at the upper radiator hose and following it to where it enters the top of the engine. The thermostat housing is right where the radiator hose meets the engine housing. It looks like half of a metal baseball. When the thermostat becomes stuck, it is reasonable to simply replace it. read more