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Hi i have a 98 Buick lesbabre i have been filling my over flow tank with anmtifreeze and when i check it the next day its emtpy again i have checked hoses and made sure that it wasent mixing with anyother fluids and the car hasent been overheating at all could it be the thermostat going bad or stuck open?

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Q: What signs mean your thermostat on your car is bad?
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Overheating or no heat from the heater are sure signs it is bad. You car is 12 years old, just replace it if you have a suspicion it is bad. You can test the thermostat but why bother? You will have to remove it to perform the test. Just replace it.


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How do you determine if your thermostat is bad?

When the car is hot, squeeze the upper radiator hose. If it feels soft, then the thermostat is not opening and therefore bad. If you squeeze the hose and its hard to squeeze, then it is pressurized and the thermostat is open. That is one way to check if the thermostat is stuck closed. If the thermostat is stuck open, then in cold conditions the car will take a long time to produce hot air from the heater.