The engine takes very long to warm up, can it be caused by a thermostat? Thermostat stuck closed: When the thermostat is stuck closed, the engine might overheat.īesides these two cases, the thermostat may also need to be replaced if the thermostat housing is leaking coolant. A stuck-open thermostat can also cause lack of heat from the heating system.
Thermostat stuck open: When the thermostat is stuck open, the engine temperature drops below normal when driving, especially on the highway in cold weather. Symptoms of a bad thermostat can be divided in two types: In cold weather, if the engine temperature drops close to the lower limit of the operating range (194☏ or 90☌), the thermostat closes again. The smaller by-pass valve is open and the coolant circulates only within the engine and through the vehicle heating system.Īs the engine warms up closer to the operating temperature, the thermostat gradually opens up, allowing coolant flow through the radiator. Ford engine cutaway.Ĭlick for a larger photo When the engine is started cold, the thermostat (the main valve) is closed there is no flow through the radiator.
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