I’ve been driving for 20+ years and have never turned the a/c off before shutting the motor down and never suffered any negative consequences as a result. This is one of those old wives tales that get passes down from generation to generation. Kind of like my grandmother used to keep the top of her console TV clean, would dust it several times a week because someone told her that the TV would ovwrheat and blow up if dust accumulated on the top of the cabinet.
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