Thermostat Replacement
What is a thermostat?
The thermostat is a valve that helps control engine temperature. When the engine is cold, the thermostat stays closed to block coolant flow to the radiator, letting the engine warm up faster. Once the engine hits a certain temperature, the thermostat opens up, allowing coolant into the radiator, where it can cool off and keep the car from overheating.
Thermostats can be controlled either mechanically or electronically.
A thermostat that is stuck closed will cause the vehicle to overheat.
If the new thermostat does not immediately resolve engine temperature problems, the cooling system needs to be checked for other issues.
A thermostat that is stuck open can cause the engine to run colder than normal and set the Check Engine Light. It may also cause poor fuel mileage and the heater to blow cool air.