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Sounds like the thermostat is sluggish to react to temperature changes

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16y ago
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Q: Temperature gauge goes up and down does it need a new thermostat?
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Why does the temperature gauge on your car fluctuate?

The temperature gauge on a car fluctuates because the car's thermostat is opening and closing. The gauge goes up when the thermostat closes and the gauge goes down when the thermostat opens.


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