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If you are absolutely sure you do not have air trapped in your cooling system then you may have a defective gauge if you are getting heat through your heater. Usually I would say you have a coolant flow problem with either a stuck thermostat or a bad water pump but if you have heat from your heater, then you must have circulating coolant in your system. I would check the gauge or the sensor.

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โˆ™ 2006-12-10 16:12:33
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Q: Your temperature gauge indicates overheating but water and oil levels are fine and heater works what is wrong?
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