I've always been advised by BMW to keep the AC on at all times to avoid moisture build up, and I've been told it's better for the system.
To be honest, I don't ever remember turning it off. Why would you want to may I ask?
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Current car: 2017 BMW G30 520d M-Sport, BMW F46 218d Grand Tourer
Previous cars: 1989 BMW E30 316i, 1998 BMW E36 323i Coupe M Sport, 2009 BMW E87 116d, 2013 BMW F31 320d M-Sport
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