Mercedes-Benz 2009 M-Class Operator's Manual page 196

Controls in detail
3-zone automatic climate control
Canada only
Function
Temperature control, driver's side
1
U Air distribution and air volume (automatic mode)
2
6 Air distribution, driver's side (directs air through the
3
windshield and side air vents)
194
Recommendation/Notes
i Set the temperature to 72‡ (22†).
i Switches on the automatic mode. The indicator lamp
in button U comes on.
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