Mercedes-Benz 2009 M-Class Operator's Manual page 191

most efficient blower speed and heating
R
power, depending on outside
temperature
air flows onto the windshield and the
R
front door windows (side air vents must
be open)
the air conditioning compressor
R
switches on at outside temperatures
above approximately 41‡ (5†) for air-
drying
Adjustments
You can adjust the air volume and the
temperature when the front defroster is
switched on. The air flow will remain on the
windshield and front door windows.
X
Press button to decrease or button
Ï
to increase air volume to the desired
Q
level.
The air volume decreases/increases to the
next lower/higher blower speed and
heating switches to the temperature that
was set before the front defroster was
switched on.
The indicator lamp in button
The indicator lamp in button
on.
or
X
Turn temperature control
1
( Y page 183) slightly in any direction.
Heating switches to the temperature that
was set before the front defroster was
switched on.
The indicator lamp in button
The indicator lamp in button
on.
i The air conditioning compressor remains
on even if the indicator lamp in button
goes out. This helps to prevent the
|
windshield from fogging.
Deactivating
X
Press button again.
|
The indicator lamp in the button goes out.
Defrosting is turned off.
The previous settings are once again in
effect. The air conditioning compressor
remains switched on.
i To deactivate, you can also press button
or U.
´
Windshield fogged on the outside
goes out.
|
comes
9
X
Switch the windshield wipers on
( Y page 116).
X
Press air distribution button
and/or
7
Y.
Air recirculation mode
Switch to air recirculation mode to prevent
goes out.
|
unpleasant odors from entering the vehicle
comes
9
from the outside (e. g. before driving through
a tunnel). This setting cuts off the intake of
outside air and recirculates the air in the
passenger compartment.
G Warning!
Fogged windows impair visibility,
endangering you and others. If the windows
begin to fog on the inside, switching off the
air recirculation mode immediately should
clear interior window fogging. If interior
window fogging persists, make sure the air
conditioning is activated, or press button
|.
X
Activating: Press button :.
The indicator lamp in the button comes on.
Controls in detail
Climate control
or
a
Z
189