Mercedes-Benz M-Class 2012 Owners Manual - Manual (Page 134)

X To switch off: press the ¬ button.
The indicator lamp in the ¬ button goes
out. The previously selected settings come
into effect again. The cooling with air
dehumidification function remains on. Air-
recirculation mode remains deactivated.
or
X Press the à button.
The indicator lamp in the ¬ button goes
out. Airflow and air distribution are set to
automatic mode.
or
X Turn controls : or B clockwise or
counter-clockwise (
Y
page 123),
(
Y
page 123).
or
X Press the K or I button.
Switching maximum cooling MAX
COOL on/off
The MAX COOL function is only available in
vehicles for the USA.
MAX COOL is only operational when the
engine is running.
When you activate MAX COOL, climate
control switches to the following functions:
R maximum cooling
R maximum airflow
R air-recirculation mode on
X To activate: press the Ù button.
The indicator lamp in the button lights up.
X To deactivate: press the Ù button
again.
The indicator lamp goes out. The previously
selected settings come into effect again.
Defrosting the windows
Windows fogged up on the inside
X Activate the ¿/Á cooling with air
dehumidification function.
X
Activate automatic mode Ã.
X
If the windows continue to fog up, activate
the defrosting function (
Y
page 131).
i You should only select this setting until
the windshield is clear again.
Windows fogged up on the outside
X Activate the windshield wipers.
X Press the _ button repeatedly until the
P or O symbol appears in the
display.
i You should only select this setting until
the windshield is clear again.
Rear window defroster
Activating/deactivating
G WARNING
Any accumulation of snow and ice should be
removed from the rear window before driving.
Visibility could otherwise be impaired,
endangering you and others.
The rear window defroster has a high current
draw. You should therefore switch it off as
soon as the window is clear as it only switches
off automatically after several minutes.
If the battery voltage is too low, the rear
window defroster may switch off.
X Turn the SmartKey to position 2 in the
ignition lock.
X Press the ¤ button.
The indicator lamp in the ¤ button lights
up or goes out.
132
Operating the climate control system
Climate
control