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Discussion Starter #1
We made a long trip in CA. On the way back, "AC Off Due to High Engine Temp" message showed up. I pulled off from freeway and cooled off the car for an hour in a shade. We didn't turn on AC since. Next day morning, with fully charged battery, the same message comes on. Whenever engine starts, fan is going at high speed with loud noise. The engine is completely cool and engine is running on battery. What is going on? Has anyone experienced this?
 

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Bad thermostat?
Bad sensor?
Low coolant level?

If you have OnStar you can ask them to give you any error codes they see.
 

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Discussion Starter #5 (Edited)
Yes, it was the thermostat failure. I took it to Chevy Dealer. The part was $74 and the labor charge was $480. Yikes. : (

I wanted to see the old part, but they said they don't have it since I did not request at the time of work order.
 

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That's strange. Unless the Volt thermostat is of a different breed, thermostats are designed to open when they fail with the result that the engine stays cool rather than over heat. When the thermostat on my Integra failed on a winters day (that's 39F here) I couldn't get any cabin heat at all and the temp gauge didn't budge.
 
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