Snowflake icon 'on', then push any/all of the three vent buttons, on left side of panel...
All in the Manual, either the one in your glove box, or the handy On Line Manual here in the 'On Line References' tab, top of any page, right center.

See page 107...
http://www.bmwmotorsports.org/pdf/e5...20-%202002.pdf

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