2007 Chevrolet HHR Q&A
2007 Chevrolet HHR Question: Coolant temp gauge only comes on now and then. Is this a bad sensor?
sounds like a bad sensor to me ,have it scan tested to get the right temp reading - goodguy
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. - ccking56