Mercedes-Benz 2008 M-Class Operator's Manual page 235

Controls in detail
3-zone automatic climate control*
Adjusting air volume
Adjusting manually
Five blower speeds are available.
Press button ˜ to decrease or
button Q to increase air volume to
the desired level.
The indicator lamp on the button U
goes out. The selected blower speed is
shown by the indicator lamps for air
volume settings 9 ( page 231).
Adjusting automatically
Press button U.
The indicator lamp on the button
comes on. The air volume is adjusted
automatically.
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