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You most likely have a bad or dirty connection at the sensor.

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Q: Why does my temperature gauge work some times on 2001 Chevrolet Impala?
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Why don't my temperature gauge only work some times on 2001 Chevy impala?

Replace your thermostat had same problem it sets a code but no check engine light


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If the temperature gauge is moving a lot while you're driving it could be a sticking thermostat. Its probably a good idea to replace it. You should check with the operators manual to find the right temperature, but your local auto parts retailer can help you with that and they're generally quite accurate. Normal thermostats are either 185 or 195, but in either case once the car gets up to operating temperature it shouldn't vary.


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