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Before you go out and buy a thermostat. Try this start the car with the radiatior cap off and let it run for 5 or ten minuets. If this works then it was air locked. Also check to see if the cooling fan(s) operate when the engine is hot. If not it could be a faulty cooling fan motor, cooling fan relay or cooling fan temp sensor.

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โˆ™ 2009-08-09 02:28:25
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Q: Why does your 1996 Pontiac Grand Am GT keep overheating even when you add a mixture of Dex and water?
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