How do I know if the thermostat in my car is bad?
How to Tell if Your Car’s Thermostat Is Bad If your engine overheats quickly or never reaches normal temperature, the cabin heat is weak, or you see a check-engine light with codes like P0128, your thermostat may be failing. In most cases, a stuck-closed thermostat causes rapid overheating and a cold upper radiator hose, while …
