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One way to easily tell is to check the bottom radiator hose, if the hose is extremely hotter than the top hose, the thermostat is not opening fully or stuck in the closed position.
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How can I tell if my thermostat is bad?
Does vehicle overheat rapidly? Do you have heat? Does temperature gauge show that vehicle is running cold
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Sometimes they'll emit a high pitched noise before they go bad. Is your engine running hot? Could be a bad thermostat.
How can you tell if your thermostat is bad in a 2001 chvy Malibu?
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What are the symptoms of a bad thermostat on a 1997 Chrysler Sebring Lxi?
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What are signs of a bad thermostat?
Two easy ways to tell are if the motor takes too long to warm up. This means the thermostat may be stuck open. If the motor gets hot and the top hose on the radiator is not warm the thermostat may be stuck closed.
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Would a bad thermostat cause overheating in 1997 ford probe?
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