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Q:

Coolant temp gauge only comes on now and then. Is this a bad sensor? on 2007 Chevrolet HHR

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does this need cleaned? The a/c does not work if the coolant temp gauge is not working.
(2) Answers
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I had the same problem. I replaced the thermostat and that fixed the problem. The new thermostat will remain open when they mess up. Mine also said coolant temp low. Hope this helps.