Start by having your mechanic perform a chemical test at the radiator for a leaking cylinder head gasket. That will allow air to sneak into the cooling system, and that air will prevent the thermostat from opening, resulting in overheating.
Forget replacing sensors. They are only reporting the condition. Replacing them won't correct the cause of the problem.
When you have an engine-related problem, you need to say which engine you have. Some are known for leaking head gaskets. Some are known for other problems. Also look at how the radiator fan is run. Most are belt-driven, but it could also be electric. If yours is electric, be sure it is turning on.
Friday, May 7th, 2021 AT 11:09 AM