Mercedes-Benz M-Class Owner's Manual page 131

Operating the climate control system
128
Turn controls : or B clockwise or anti-
X
clockwise (
Y
or
Press the K or I button.
X
Demisting the windows
Windows misted up on the inside
Activate the ¿/Á cooling with air
X
dehumidification function.
Activate automatic mode Ã.
X
If the windows continue to mist up, activate
X
the demisting function (
i
You should only select this setting until
the windscreen is clear again.
Windows misted up on the outside
Activate the windscreen wipers.
X
Press the _ button repeatedly until the
X
P or O symbol appears in the dis-
play.
i
You should only select this setting until
the windscreen is clear again.
Rear window heating
Switching on/off
G
WARNING
Clear all windows of ice or snow before setting
off. Otherwise, impaired visibility could
endanger you and others.
The rear window heating has a high current
draw. You should therefore switch it off as
soon as the window is clear, It otherwise
switches off automatically after several
minutes.
If the battery voltage is too low, the rear win-
dow heating may switch off.
12 THERMOTRONIC automatic climate control only.
page 121), ( page 121).
Y
page 127).
Y
Turn the key to position 2 in the ignition
X
lock.
Press the ¤ button.
X
The indicator lamp in the ¤ button lights
up or goes out.
Problems with the rear window heating
The rear window heating has switched off
prematurely or cannot be activated.
Switch off any consumers that are not
X
required, e.g. reading lamps or interior
lighting.
When the battery is sufficiently charged,
the rear window heating is activated again
automatically.
Activating/deactivating air-recircula-
tion mode
You can deactivate the flow of fresh air if
unpleasant odours are entering the vehicle
from outside. The air already inside the vehi-
cle will then be recirculated.
The operation of air-recirculation mode is the
same for all control panels.
G
WARNING
Only switch over to air-recirculation mode
briefly at low outside temperatures. Other-
wise, the windows could mist up, thus impair-
ing visibility and endangering yourself and
others. This may prevent you from observing
the traffic conditions, thereby causing an
accident.
Turn the key to position 2 in the ignition
X
lock.
To activate: press the d button.
X
The indicator lamp in the d button lights
up.
i
In the event of high pollution levels
high outside temperatures, air-recircula-
tion mode is automatically activated. When
air-recirculation mode is activated auto-
12
or at