Mercedes-Benz 2009 M-Class Operator's Manual page 187

Function
Air volume display
b
· Decreasing air volume
c
1 Rear window defroster
d
: Air recirculation
e
Interior temperature sensor
f
´ Climate control on/off
g
Recommendation/Notes
i At very low temperatures, rear window defroster
operation is delayed until the vehicle interior has
warmed up.
i Only use this function for a short time, e.g. in a tunnel.
Otherwise, the windows can fog up due to lack of fresh
air.
i Switches on the climate control system. The indicator
lamp in button ´ goes out.
Controls in detail
Climate control
( Y page 188)
( Y page 204)
( Y page 189)
( Y page 186)
Z
185