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2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
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Then it's very possible that the "steam" was actually coolant escaping under pressure. That might also suggest that there was not enough coolant and the ECT sensor was not able to provide accurate temperature data to the computer. If that happens, the BCM will turn the radiator fans on high and cancel any AC. Usually it will also set the temp gauge to either full Cold or full Overheat.

What we haven't heard is whether there is a CEL and how much coolant it needed to fill it up again, if any.

You should also scan it for codes and use them to guide you.

I'm not aware of the computer shutting the engine down and preventing you from trying to start it, so if it won't crank, then the starter system may have failed in some way, or maybe the engine really is a paperweight.
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