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Well a car that old will probably develop some problems with the coolant system. First thing you can do is check your thermostat. That is probably due by now. Once you change your thermostat you can test it by sticking it in a pot of boiling water with a temperature gauge if it doesn't open or doesn't open until its really really hot (like over 200 degrees) If your water pump was out you would probably be leaking antifreeze at a good rate. Temp sensors don't really go bad...you would have a really bad or no reading at all...So yup i'm guessing it's the thermostat...which engine does your car have in it?
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