BMW 1999-2005 M3 Service Manual page 1128

Heating and Air Conditioning
10 of 22
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/6...
2 - Defrost
3 - Footwell
4 - Recirculation
5 - Fresh air
Two different types of air distribution
motors are used in the system. Fast
acting motors (A) are used for the fresh
air/recirculation flaps. (Right side
shown.)
-
Slower acting motors (B) are used
for the other operations.
The center dashboard air outlet
distribution motor (arrow) allows
ventilation air temperature to be
controlled by the driver or passenger.
When fresh air is selected, the fresh air
inlet distribution flaps are positioned
according to road speed and blower
motor speed. The motors close the air
inlet flaps incrementally according to
road speed but the motion is dampened
to avoid closing and opening continually
due to slight speed changes.
2/25/2009 11:16 PM