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The heating system is an option in ADDITION to the professional iDrive Nav. It has a separate remote and it does actually heat up the car. The function you are referring to is just timed activation of the fan. Obviously this will do nothing to defrost/demist the car, it is actually of more use in hot weather to allow some ventilation before you get in the car. I don't think this heating system is an option available to E9x vehicles, but you can have it on an X5/5er/7er (Auxillary heating system option 536).
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