5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
It will blow warm air into the cabin while the car is off, using the heat from the (presumably) just-driven engine to warm you up without having to actually run the car.
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According to the video that comes with the car, it blows warm air into the cabin for 15 minutes after you've left the car. It's supposed to be used on cool days for long trips where you've stopped (or some other break) for lunch and want a nice warm car when you get back in.
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