Maximum Defrosting; Air Distribution Control Via M-Bus - BMW 1999-2005 M3 Service Manual

Heating and Air Conditioning
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Maximum defrosting

Pressing the defrost button turns on
maximum defrost functions:
Fresh air distribution valves are
opened.
Recirculation valves are closed.
Windshield defrost vents are
opened.
All other air distribution vents are
closed.
Blower runs at maximum speed.
Rear window defroster is switched
on.
Note:
When windshield defrosting is turned on,
the A/C compressor does not run
automatically, although it can be turned
on manually.

Air distribution control via M-bus

Five stepper motors control fresh,
heated and air conditioned air
distribution.
1 - Face vent
2/25/2009 11:16 PM