Mercedes-Benz 2009 M-Class Operator's Manual page 190

Controls in detail
Climate control
X
Deactivating: Press button
The indicator lamp in button
The automatic operation of air volume
switches off. The selected blower speed is
shown in air volume display
( Y page 183).
or
X
Press air distribution button {, a, or
Y.
The indicator lamp in button
The automatic operation of air distribution
switches off.
Setting the temperature
You can adjust the air temperature on each
side of the passenger compartment. You
should raise or lower the temperature setting
in small increments, preferably starting at
72‡ (22†).
X
Increasing/decreasing: Turn
temperature control and/or
1
( Y page 183) slightly clockwise or
counterclockwise.
188
or Q.
· Adjusting air distribution
goes out.
U
The air distribution can be adjusted manually.
The symbols on the buttons represent the
following functions:
b
Symbol
{
a
goes out.
U
Y
X
Press the desired air distribution button
{, a, or Y.
The indicator lamp in button
The automatic mode is switched off. Air
distribution is controlled according to the
desired button.
7
Function
Directs air to the windshield and
side air vents
Directs air through the center
and side air vents
Directs air to the footwells and
side air vents
goes out.
U
Adjusting air volume
X
Decrease/increase: Press button
Q.
The automatic mode is switched off. The
selected blower speed is shown in air
volume display ( Y page 183).
b
Front defroster
You can use this setting to defrost the
windshield, for example if it is iced up.
You can also defog the windshield and the
side windows.
i Keep this setting selected only until the
windshield or the side windows are clear
again.
Activating
X
Press button |.
The indicator lamp in the button comes on.
The climate control switches to the
following functions automatically:
or
·