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You may have air trapped in the cooling system.This will cause the gauge to spike. Try this: remove the radiator cap and allow the engine to run for about 20 minutes. Add coolant as necessary. If this does not work I would replace the stat. Finally, I would check the actual cooalant with a thermometer to determine the actual temp. I hope this helps you. Mark

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Q: Why would a temp gauge in a car go up like the car is going to overheat when the temp gauge sytem light stays off?
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