Q: thermostat on 1997 Cadillac DeVille

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I'm always adding coolant and the car's over heating. I believe I not only need to have my radiator flushed, but also change my thermostat. Is that normally the case?? And how much would that normally run. plus witha new fuel filter??
(1) Answer
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I would first have the cooling system checked for leaks. The way an automotive shop would locate the leak is by removing the radiator cap and attaching an adapter that screws on in place of the radiator cap. Something that looks like a bicycle pump with a pressure gauge attached to it is used to "pump up" pressure to simulate pressure generated when the cooling system is at operating temperature, the leak is then found sometimes it is obviously leaking from a coolant hose or cracked housing, failed gasket or water pump, sometimes the engines cooling system needs to be inspected from below or inspected using a mirror and flash light. If the coolant leak is not fist addressed the engine may blow a head gasket.
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