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The heater core may be plugged or not flowing properly. This would not allow the water to flow properly to cool the motor. Also you may have a bad or loose ground wire to your heater switch, this will give you a false reading on the temperature gauge.

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Q: Could someone help. I have a 1992 Buick Rivera and the temperature gauge in car is going toward the red I turn off the heater and it drops away. is it some kind of sensor heater core thermostat?
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