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Simple answer, the AC may have continued to run after you thought you turned it off. In my 2003 Sentra the AC seemed to have a minimum amount of time that it would run, I'm not sure if this was to keep condensation from building up in the vents or what but if you pushed the button to turn it on then pushed it again to turn it off the light would go off but the compressor would keep running for quite a while. I eventually figured out a hack to disable this so you can turn the ac on and off as you please. Its entirely possible this malibu was exhibiting some similar behavior and you couldn't detect it since it was an unfamiliar vehicle.
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