The thermostat has quite an important job, especially when it’s cold outside and you need your engine to warm up faster. It bypasses the coolant from not entering the radiator, so the coolant ...

The probe side of a thermostat. Depositphotos 4. Inspect and Replace Thermostat While the radiator is out, it’s a good idea to generally refresh the cooling system.

If you need to have your radiator or any gaskets or hoses replaced in your cooling system, you may also want to ask your mechanic about whether you should replace your thermostat at the same time.