climate control MERCEDES-BENZ G-CLASS SUV 2012 User Guide

Operating the climate control system
Switching climate control on/off
Points to observe before use i
If climate control is switched off, the air supply and air circulation are also switched off.
Only select this setting briefly. Otherwise, the windows may mist up.
Switching the air conditioning on :
To set the temperature, left (Y page 131)
; To demist the windscreen (Y page 131)
= To switch the ZONE function on/off (Y page 131)
? To activate/deactivate cooling with air dehumidification (Y page 128)
A To switch the rear window heating on/off (Y page 133)
B To set the temperature, right (Y page 131)
C To activate/deactivate air-recirculation mode (Y page 133)
D To set the air distribution (Y page 131)
E To increase the airflow (Y page 131)
F To reduce the airflow (Y page 131)
G Display
H To switch climate control on/off (Y page 126)
I To set climate control to automatic mode (Y page 130)126
Operating the climate control systemClimate control

X
Turn the key to position 2(Ypage 143) in the ignition lock.
X Press the Ãbutton.
The indicator lamp in the Ãbutton lights up. Airflow and air distribution are set to auto-
matic mode.
or
X Press the ^button.
The indicator lamp in the ^button goes out. The previous settings are reactivated.
Switching the climate control off :
To set the temperature, left (Y page 131)
; To demist the windscreen (Y page 131)
= To switch the ZONE function on/off (Y page 131)
? To activate/deactivate cooling with air dehumidification (Y page 128)
A To switch the rear window heating on/of f(Ypage 133)
B To set the temperature, right (Y page 131)
C To activate/deactivate air-recirculation mode (Y page 133)
D To set the air distribution (Y page 131)
E To increase the airflow (Y page 131)
F To reduce the airflow (Y page 131)
G Display
H To switch climate control on/off (Y page 126)
I To set climate control to automatic mode (Y page 130)
X Press the ^button.
The indicator lamp in the ^button lights up. Operating the climate control system
127Climate control Z

Activating/deactivating the cooling with air dehumidification function
Points to observe before use G
WARNING
If the "cooling with air dehumidification" function is deactivated, the air inside the vehicle will not
be cooled (during warm weather) or dehumidified. The windows could mis tup more quickly. This
may prevent you from observing the traffic conditions, thereby causing an accident.
The cooling with air dehumidification function is only available when the engine is running.
The air inside the vehicle is cooled and dehumidified according to the temperature selected.
Condensation may drip from the underside of the vehicle when cooling mode is active. This
is normal and not a sign that there is a malfunction.
i The cooling with air dehumidification function uses refrigerant R134a. This refrigerant does
not contain chlorofluorocarbons, and therefore does not damage the ozone layer.
Activating the cooling with air dehumidification function :
To set the temperature, left (Y page 131)
; To demist the windscreen (Y page 131)
= To switch the ZONE function on/off (Y page 131)
? To activate/deactivate cooling with air dehumidification (Y page 128)
A To switch the rear window heating on/off (Y page 133)
B To set the temperature, right (Y page 131)
C To activate/deactivate air-recirculation mode (Y page 133)
D To set the air distribution (Y page 131)
E To increase the airflow (Y page 131)
F To reduce the airflow (Y page 131)
G Display 128
Operating the climate control systemClimate control

H
To switch climate control on/off (Y page 126)
I To set climate control to automatic mode (Y page 130)
X Press the Ábutton.
The indicator lamp in the Ábutton lights up.
Deactivating the cooling with air dehumidification function :
To set the temperature, left (Y page 131)
; To demist the windscreen (Y page 131)
= To switch the ZONE function on/off (Y page 131)
? To activate/deactivate cooling with air dehumidification (Y page 128)
A To switch the rear window heating on/of f(Ypage 133)
B To set the temperature, right (Y page 131)
C To activate/deactivate air-recirculation mode (Y page 133)
D To set the air distribution (Y page 131)
E To increase the airflow (Y page 131)
F To reduce the airflow (Y page 131)
G Display
H To switch climate control on/off (Y page 126)
I To set climate control to automatic mode (Y page 130)
X Press the Ábutton.
The indicator lamp in the Ábutton goes out. The cooling with air dehumidification func-
tion has a delayed switch-of ffeature. Operating the climate control system
129Climate control Z

Problems with the cooling with air dehumidification function
:
To set the temperature, left (Y page 131)
; To demist the windscreen (Y page 131)
= To switch the ZONE function on/off (Y page 131)
? To activate/deactivate cooling with air dehumidification (Y page 128)
A To switch the rear window heating on/off (Y page 133)
B To set the temperature, right (Y page 131)
C To activate/deactivate air-recirculation mode (Y page 133)
D To set the air distribution (Y page 131)
E To increase the airflow (Y page 131)
F To reduce the airflow (Y page 131)
G Display
H To switch climate control on/off (Y page 126)
I To set climate control to automatic mode (Y page 130)
When you press the Ábutton, the indicator lamp in the button flashes three times or
remains off. You can no longer switch on the cooling with air dehumidification function.
X Visit a qualified specialist workshop. Setting climate control to automatic
mode
In automatic mode, the set temperature is
maintained at a constant level. The system
automatically regulates the temperature of
the dispensed air, the airflow and the air dis-
tribution. Automatic mode will achieve optimal opera-
tion if cooling with air dehumidification is also
activated. If desired, cooling with air dehu-
midification can be deactivated.130
Operating the climate control systemClimate control

X
Turn the key to position 2(Ypage 143) in
the ignition lock.
X Set the desired temperature.
X To switch on: press theÃbutton.
The indicator lamp in the Ãbutton lights
up. Automatic air distribution and airflow
are activated.
X To switch off: press the_button.
or
X Press the IorK button.
The indicator lamp in the Ãbutton goes
out. Setting the temperature
You can set the temperature separately for
the driver's and front-passenger sides with
controls :orB(Y page 125).
X Turn the key to position 2(Ypage 143) in
the ignition lock.
X Set control :orB(Y page 125) to the
desired temperature.
Only change the temperature setting in
small increments. Start at 22 †. Setting the air distribution
X Turn the key to position 2(Ypage 143) in
the ignition lock.
X Press the _button repeatedly until the
desired symbol appears in the display.
P Directs the airflow through the centre
vents
O Directs the airflow through the foot-
well air vents
S Directs the airflow through the centre
and footwell vents
¯ Directs the airflow through the demis-
ter vents
a Directs the airflow through the demis-
ter vents and the footwell. Setting the airflow
X Turn the key to position 2(Ypage 143) in
the ignition lock.
X To increase: press theKbutton.
X To reduce: press theIbutton.
i The airflow from the rear-compartment
vents and the centre vents is the same. Activating/deactivating the ZONE
function
X To switch on: press theábutton.
The indicator lamp in the ábutton lights
up.
i The temperature setting for the driver's
side is not adopted for the front-passenger
side and the rear compartment. The tem-
perature for the front-passenger side and
the rear compartment must be set sepa-
rately.
X To switch off: press theábutton.
The indicator lamp in the ábutton goes
out.
i The temperature setting for the driver's
side is adopted for the front-passenger side
and the rear compartment. Demisting the windscreen
You can use this function to demist the wind-
screen or to demist the inside of the wind-
screen and the side windows.
i You should only select the demisting
function until the windscreen is clear again.
X Turn the key to position 2(Ypage 143) in
the ignition lock.
X To activate: press the¬button.
The indicator lamp in the ¬button lights
up. Operating the climate control system
131Climate control Z

The climate control system switches to the
following functions:
R
cooling with air dehumidification (only
with engine running)
R high airflow (depending on the outside
temperature)
R high temperature (depending on the out-
side temperature)
R air distribution to the windscreen and
fronts ide windows
R air-recirculation mode off
X To deactivate: press the¬button.
The indicator lamp in the ¬button goes
out. The previous settings are reactivated.
The cooling with air dehumidification func-
tion remains on. Air-recirculation mode
remains deactivated.
or
X Press the Ãbutton.
The indicator lamp in the ¬button goes
out. Airflow and air distribution are set to
automatic mode.
or
X Turn controls :orB clockwise or anti-
clockwise (Y page 125).
or
X Press the KorI button. Demisting the windows
Windows misted up on th einside X
Activate the Ácooling with air dehu-
midification function.
X Activate automatic mode Ã.
X If the windows continue to mist up, activate
the demisting function (Y page 131).
i You should only select this setting until
the windscreen is clear again. Windows misted up on the outside X
Switch on the windscreen wipers
(Y page 119).
X Press the _button repeatedly until the
P orO symbol appears in the dis-
play.
i You should only select this setting until
the windscreen is clear again. Switching the windscreen heating
on/off
X
Turn the key to position 2(Ypage 143) in
the ignition lock.
X To switch on: press button;.
Indicator lamp :lights up.
X To switch off: press button;.
Indicator lamp :goes out.
i At outside temperatures above 10 †, the
windscreen heating cannot be activated.
Indicator lamp :lights up briefly when you
attempt to activate it and then goes out
again.
i The windscreen heating has a high cur-
rent draw. You should therefore switch it
off as soon as the windscreen is clear. The
windscreen heating otherwise switches
itself off automatically after 10 minutes.
i If the battery voltage is too low, the wind-
screen heating may switch off. If the wind-
screen heating is automatically deactiva-
ted, indicator lamp :flashes. The wind-
screen heating will automatically switch 132
Operating the climate control systemClimate control

back on as soon as ther
eis sufficient volt-
age. Switching the rear window heating
on/off
Switching on/off G
WARNING
Cleara ll windows of ice or snow before setting
off .O therwise, impaired visibility could
endanger you and others.
X Turn the key to position 2(Ypage 143) in
the ignition lock.
X USA only: press theªbutton.
The indicator lamp in the ªbutton lights
up or goes out.
i The rea rwindow heating has ahigh cur-
ren tdraw.Y ou should therefore switch it
off as soon as the window is clear. It only
switches itself off automatically after a few
minutes.
i If the battery voltage is too low, the rear
window heating may switch off.
Problems with the rear window heating If the indicator lamp in the
ªrear window
heating button flashes, the on-board voltage
is too low. The rear window heating has
switched off prematurely or cannot be acti-
vated.
X Switch off any consumers that are not
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
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.
X Turn the key to position 2(Ypage 143) in
the ignition lock.
X To switch on: press thedbutton.
The indicator lamp in the dbutton lights
up.
i Air-recirculation mode is automatically
activated at high levels of pollution or at
high outside temperatures. When air-recir-
culation mode is activated automatically,
the indicator lamp in the dbutton is not
lit.
Outside air is added after approximately
30 minutes.
X To deactivate: press thedbutton.
The indicator lamp in the dbutton goes
out.
i Air-recirculation mode switches off auto-
matically:
R after approximately five minutes at out-
side temperatures below approximately
5 †
R after approximately five minutes if cool-
ing with air dehumidification is deactiva-
ted
R after approximately 30 minutes at out-
side temperatures above approximately
5 † Activating/deactivating the residual
heat function
It is possible to make use of the residual heat
of the engine to continue heating the station- Operating the climate control system
133Climate control Z

ary vehicle for up to 30 minutes after the
engine has been switched off
.The heating
time depends on the coolant temperature and
on the interior temperature that has been set.
i The blower will run at a low speed regard-
less of the airflow setting.
i If you activate the residual heat function
at high temperatures, only the ventilation
will be activated.
X Turn the key to position 0(Ypage 143) in
the ignition lock or remove it.
X To activate: press theÁbutton.
The indicator lamp in the Ábutton lights
up.
X To deactivate: press theÁbutton.
The indicator lamp in the Ábutton goes
out.
i Residual heat is deactivated automati-
cally:
R after approximately 30 minutes
R when the ignition is switched on
R if the battery voltage drops
R if the coolant temperature is too low Auxiliary heating
Important safety notes G
WARNING
Exhaust fumes are produced when the auxili-
ary heating is in operation. Inhaling these
exhaust fumes can be poisonous. You should
therefore switch off the auxiliary heating in
confined spaces without an extraction sys-
tem, e.g. a garage. G
WARNING
When operating the auxiliary heating parts of
the vehicle can get very hot. Make sure that
the exhaust system does not under any cir-
cumstances come into contact with easily
ignitable material such as dry grass or fuels.
The material could otherwise ignite and set the vehicle alight. Choose your parking spot
accordingly.
Operating the auxiliary heating is thus pro-
hibited at filling stations or when your vehicle
is being refuelled. You must therefore switch
off the auxiliary heating at filling stations.
! Operating the auxiliary heating/ventila-
tion draws on the vehicle battery. After you
have heated or ventilated the vehicle a
maximum of two times, drive for a longer
distance.
i Switch the auxiliary heating on regularly
once a month for approximately ten
minutes.
The auxiliary heating heats the air in the vehi-
cle interior without using the heat of the run-
ning engine. The auxiliary heating is operated
directly using the vehicle's fuel. For this rea-
son, the tank content must be at least at
reserve fuel level to ensure that the auxiliary
heating functions.
The auxiliary heating/ventilation automati-
cally adjusts to changes in temperature and
weather conditions. For this reason, the aux-
iliary heating could switch from ventilation
mode to heating mode or from heating mode
to ventilation mode.
You cannot use the auxiliary ventilation to
cool the vehicle interior to a temperature
lower than the outside temperature.
Before switching on X
Turn the key to position 2(Ypage 143) in
the ignition lock.
X Set the temperature.
The auxiliary heating/ventilation can be acti-
vated even when climate control is set to
manual. Optimum comfort can be attained
when the system is set to automatic mode.
Set the temperature to 22 †.
The auxiliary heating/ventilation can be acti-
vated or deactivated using the remote control
or the button on the centre console. 134
Operating the climate control systemClimate control

The on-board computer can be used to spec-
ify up to three departure times, one of which
may be preselected (Y page 223).
Switching the auxiliar yheating/venti-
lation on/off using the centre console
button Auxiliar
yheating overview :
To activate/deactivate th eauxiliary heat-
ing
The colours of the indicator lamps on the but-
to nh ave the following meanings:
Blue Auxiliary ventilatio nswitched on
Red Auxiliary heating switched on
Yellow Departure time preselected (Ypage 223)
Switching on the auxiliary heating/venti-
lation :
To activate/deactivate th eauxiliary heat-
ing X
Press button :.
The red or blue indicator lamp in but-
ton :lights up.
Switching off the auxiliary heating/venti-
lation :
To activates/deactivate th eauxiliary
heating
X Press button :.
The red or blue indicator lamp in but-
ton :goes out.
Switching the auxiliary heating/venti-
lation on/off using the remote control Auxiliar
yheating remote control :
Display
; . To check the status/set the depar-
ture time
= ^ To switch off the auxiliary heating/
ventilation Operating the climate control system
135Climate control Z