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Do engine thermostats just go bad?

April 26, 2017bad engine thermostats

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Do engine thermostats just go bad?

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Over time engine thermostats do fail. This normally results in two main symptoms. 1.) The engine will overheat, particularly when driving. This is a result of the charge cylinder leaking or getting stuck in the closed position. The valve does not open [sufficiently] and the coolant flow is restricted. 2.) The engine does not warm up enough or runs too cool. This normally results from a broken spring/valve or the charge cylinder sticking open. These symptoms often occurs on old thermostats, after the cooling system is drained and re-filled. For this reason many technicians advise replacing the thermostat on higher mileage vehicles when the cooling system is serviced.