2012 MERCEDES-BENZ GL window

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
Overview of climate control systems
Important safety notes
GWARNING
Severe conditions (e.g. strong air pollution)
may require replacement of the filter before
its scheduled replacement interval. A clogged
filter will reduce the air volume to the interior
and the windows could fog up, impairing
visibility and endangering you and others.
Have a blocked filter replaced at a Mercedes-
Benz Center as soon as possible.
GWARNING
Follow the recommended settings for heating
and cooling given on the following pages.
Otherwise, the windows could fog up,
impairing visibility and endangering you and
others.
The automatic climate control 13
adjusts the
temperature and the humidity of the vehicle
interior and filters undesired substances from
the air.
The automatic climate control 13
is only
operational when the engine is running. 14
Optimum operation is only achieved when
you drive with the side windows and the
sliding sunroof closed.
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature ( Y page 91).
This will speed up the cooling process and
the desired vehicle interior temperature
will be reached more quickly.
i The integrated filter can filter out most
particles of dust and completely filters out
pollen. A clogged filter reduces the amount
of air supplied to the vehicle interior. For
this reason, you should always observe the
interval for replacing the filter, which is
specified in the Service Booklet. As it
depends on environmental conditions, e.g.
heavy air pollution, the interval may be
shorter than stated in the Service Booklet.13 Canada only.
14 The residual heat function can only be activated/deactivated when the ignition is switched off.134Overview of climate control systemsClimate control

Control panel for dual-zone automatic climate control:To set the temperature, left (Y page 141);To set climate control to automatic ( Y page 140)=To defrost the windshield ( Y page 142)?To increase the airflow ( Y page 142)ATo direct the airflow through the defroster vents ( Y page 142)BTo activate/deactivate cooling with air dehumidification ( Y page 139)CTo set the temperature, right ( Y page 141)DTo switch rear-compartment climate control on/off ( Y page 138)ETo direct the airflow through the center and side air vents ( Y page 142)FTo direct the airflow to the footwells and side air vents ( Y page 142)GTo display the airflow levelHTo reduce the airflow ( Y page 142)ITo switch the rear window defroster on/off ( Y page 143)JTo activate/deactivate air-recirculation mode ( Y page 144)KInterior temperature sensorLTo switch climate control on/off ( Y page 138)Notes on using dual-zone automatic
climate control
The following contains notes and
recommendations on optimum use of dual-
zone automatic climate control.
R Activate climate control using the à and
Á buttons. The indicator lamps in the
à and Á buttons light up.
R Set the temperature to 72 ‡ (22 †).
R Only use the "defrosting" function briefly
until the windshield is clear again.
R Only use "air-recirculation" mode briefly,
e.g. if there are unpleasant outside odorsor when in a tunnel. The windows could
otherwise fog up as, in air-recirculation
mode, no fresh air is drawn into the vehicle.
R Use the residual heat function if you want
to heat or ventilate the vehicle interior
when the ignition is switched off. The
"residual heat" function can only be
activated or deactivated with the ignition
switched off.Overview of climate control systems135Climate controlZ

Control panel for 3-zone automatic climate control
Canada only
Front control panel:To set the temperature, left (Y page 141);To set climate control to automatic ( Y page 140)=To direct the airflow through the defroster vents, left ( Y page 142)?To defrost the windshield ( Y page 142)ATo increase the airflow ( Y page 142)BTo switch the rear window defroster on/off ( Y page 143)CTo direct the airflow through the defroster vents, right ( Y page 142)DTo operate the rear-compartment climate control via the front control panel
( Y page 138)ETo set the temperature, right ( Y page 141)FTo switch climate control on/off ( Y page 138)GTo direct the airflow to the footwells and side air vents, right ( Y page 142)HTo direct the airflow through the center and side air vents, right ( Y page 142)ITo activate/deactivate cooling with air dehumidification ( Y page 139)To activate/deactivate the residual heat function ( Y page 144)JDisplayKTo reduce the airflow ( Y page 142)LTo activate/deactivate air-recirculation mode ( Y page 144)MTo direct the airflow through the center and side air vents, left ( Y page 142)NTo direct the airflow to the footwells and side air vents, left ( Y page 142)OInterior temperature sensor136Overview of climate control systemsClimate control

HTo reduce the airflow (Y page 142)ITo switch the rear window defroster on/off ( Y page 143)JTo activate/deactivate air-recirculation mode ( Y page 144)KInterior temperature sensorLTo switch climate control on/off ( Y page 138) Rear control panelMTo increase the airflow ( Y page 142)NTo set the temperature ( Y page 141)OTo set the rear-compartment climate control to automatic ( Y page 140)PTo direct the airflow through the rear air vents ( Y page 142)QTo direct the airflow through the footwell vents ( Y page 142)RTo switch rear-compartment climate control on/off ( Y page 138)STo reduce the airflow ( Y page 142)Notes on using 3-zone automatic
climate control
The following contains instructions and
recommendations to enable you to get the
most out of your automatic climate control.
R Activate climate control using the à and
Á buttons. The indicator lamps in the
à and Á buttons light up.
R Set the temperature to 72 ‡ (22 †).
R Only use the "defrosting" function briefly
until the windshield is clear again.
R Only use "air-recirculation" mode briefly,
e.g. if there are unpleasant outside odors
or when in a tunnel. The windows could
otherwise fog up as, in air-recirculation
mode, no fresh air is drawn into the vehicle.
R Use the MONO function if you want to
adopt the temperature and air distribution
settings from the driver's side for all
climate zones. The indicator lamp in the
º button lights up.
R Use the residual heat function if you want
to heat or ventilate the vehicle interior
when the ignition is switched off. The
"residual heat" function can only be
activated or deactivated with the ignition
switched off.Operating the climate control system
Activating/deactivating climate
control
Important information
GWARNING
When the climate control system is
deactivated, the outside air supply and
circulation are also deactivated. Only choose
this setting for a short time. Otherwise the
windows could fog up, impairing visibility and
endangering you and others.
i Switch on climate control primarily using
the à button ( Y page 140).
138Operating the climate control systemClimate control

Switching the front climate control on/
off using the front control panelXTurn the SmartKey to position 2 in the
ignition lock.XTo switch on: press the à button.
The indicator lamp in the à button lights
up. Airflow and air distribution are set to
automatic mode.
or
XPress the ^ button.
The indicator lamp in the ^ button goes
out. The previously selected settings come
into effect again.XTo switch off: press the ^ button.
The indicator lamp in the ^ button lights
up.
Switching the rear-compartment
climate control on/off using the front
control panel
2-zone automatic climate control
XTurn the SmartKey to position 2 in the
ignition lock.XTo switch on/off: press the ± button.
The indicator lamp in the ± button lights
up or goes out.
3-zone automatic climate control
USA only:
XTurn the SmartKey to position 2 in the
ignition lock.XTo switch on/off: press the ± button.
The indicator lamp in the ± button lights
up or goes out.
Canada only:
XTurn the SmartKey to position 2 in the
ignition lock.XTo switch on: press the Y button.
ON and MODE are shown in the automatic
climate control display behind the Y
symbol. The MODE display goes out after
three seconds. The display switches back
to the standard display.XTo switch off: press the Y button.
MODE is shown in the display behind the
Y symbol.XPress button ^.
OFF is shown in the display behind the
Y symbol.
Switching the rear-compartment
climate control on/off using the rear
control panel
3-zone automatic climate control
XTurn the SmartKey to position 2 in the
ignition lock.XSwitch on automatic climate control using
the front control panel.XTo switch on: press the à button.
The indicator lamp in the à button lights
up.XTo switch off: press the ^ button.
The indicator lamp in the ^ button lights
up.
Activating/deactivating cooling with
air dehumidification
Important information
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.
GWARNING
If you switch off the cooling function, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog up
more quickly. Window fogging may impair
visibility and endanger you and others.
Condensation may drip from the underside of
the vehicle when it is in cooling mode. This is
normal and not a sign that there is a
malfunction.
Operating the climate control system139Climate controlZ

iThe cooling with air dehumidification
function uses refrigerant R134a. This
coolant does not contain
chlorofluorocarbons, and therefore does
not damage the ozone layer.
Activating/deactivating
! If the cooling with air dehumidification
does not switch on, it is possible that the
climate control system has lost coolant.
Have the cooling with air dehumidification
checked at a qualified specialist workshop.
XTo activate: press the Á button.
The indicator lamp in the Á button lights
up.XTo switch off: press the Á button.
The indicator lamp in the Á button goes
out. The cooling with air dehumidification
function has a delayed switch-off feature.
Problems with the cooling with air
dehumidification function
If the indicator lamp in the Á button does
not go out when the function is activated, the
cooling with air dehumidification function is
deactivated due to a malfunction. You can no
longer switch on the cooling with air
dehumidification function.
XConsult a qualified specialist workshop.
Setting climate control to automatic
GWARNING
If you switch off the cooling function, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog up
more quickly. Window fogging may impair
visibility and endanger you and others.
In automatic mode, the set temperature is
maintained automatically at a constant level.
The system automatically regulates the
temperature of the dispensed air, the airflow
and the air distribution.
Automatic mode will achieve optimal
operation if cooling with air dehumidification
is also activated. If desired, cooling with air
dehumidification can be deactivated.
Controlling the front climate control
using the front control panelXTurn the SmartKey to position 2 in the
ignition lock.XSet the desired temperature.XTo activate: press the à button.
The indicator lamp in the à button lights
up. Automatic air distribution and airflow
are activated.XTo deactivate: press the K or I
button.
The indicator lamp in the à button goes
out. Automatic airflow is deactivated and
the airflow is controlled according to the
level set. Automatic air distribution
remains activated.
or
XPress the Z, M , ¯ , \ , P ,
c or O button.
The indicator lamp in the à button goes
out. Automatic air distribution is
deactivated. Air distribution is controlled
according to the position set. Automatic
airflow remains activated.
Controlling the rear-compartment
climate control automatically using the
rear control panel
XTurn the SmartKey to position 2 in the
ignition lock.XSwitch on automatic climate control using
the front control panel.XSet the desired temperature.XTo activate: press the à button.
The indicator lamp in the à button lights
up. Automatic air distribution and airflow
are activated.140Operating the climate control systemClimate control

Only change the temperature setting in
small increments. Start at 72 ‡ (22 †).
Setting the air distribution
Air distribution settings
Automatic climate control: the air distribution
can be set individually for the driver's and
front-passenger sides. 17
Front control unit:
ZDirects the airflow through the
defroster ventsMDirects the airflow through the
defroster vents¯Directs the airflow through the
defroster ventscDirects the airflow through the
footwell and side air ventsODirects the airflow through the
footwell and side air vents\Directs the airflow through the center
and side air ventsPDirects the airflow through the center
and side air vents
Rear control panel:
MDirects the airflow through the rear-
compartment air ventsODirects the airflow through the
footwell air vents
Adjusting
XTurn the SmartKey to position 2 in the
ignition lock.XPress the Z, M , ¯ , c , O ,
\ or P button.Setting the airflowXTurn the SmartKey to position 2 in the
ignition lock.XTo increase/reduce: press the K or
I button.
Vehicles with Voice Control System: when the
Voice Control System is switched on, the
airflow is restricted to 50%. When command
input is complete, the airflow is adjusted back
to the previous setting.
Activating/deactivating the MONO
function
The MONO function is only available with
automatic climate control. 18
You can use the MONO function to adopt the
settings configured for temperature, air
distribution and airflow on the driver's side for
the front-passenger side and the rear
compartment.
XPress the º button.
The indicator lamp in the º button lights
up or goes out.
Defrosting the windshield
You can use this function to defrost the
windshield or to defrost the inside of the
windshield and the side windows.
i You should only select the defrosting
function until the windshield is clear again.
XTurn the SmartKey to position 2 in the
ignition lock.XTo activate: press the ¦ button.
The indicator lamp in the ¦ button lights
up.17 Canada only.
18 Canada only.142Operating the climate control systemClimate control

The climate control system switches to the
following functions:
R cooling with air dehumidification on
R high airflow 19
R high temperature 19
R air distribution to the windshield and
front side windows
R air-recirculation mode offXTo 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
XPress the ^ button.
or
XPress the à button.
or
XTurn the temperature control clockwise or
counter-clockwise.
or
XPress the K or I button.
Defrosting the windows
Windows fogged up on the inside
XActivate the cooling with air
dehumidification function Á.XActivate automatic mode Ã.XIf the windows continue to fog up, activate
the defrosting function ( Y page 142).
i
You should only select this setting until
the windshield is clear again.
Windows fogged up on the outsideXSwitch on the windshield wipers.XPress the P/\ 20
or O /c 20
air distribution button.
i You should only select this setting until
the windshield is clear again.
Rear window defroster
Activating/deactivating
GWARNING
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.
XTurn the SmartKey to position 2 in the
ignition lock.XPress the ª button.
The indicator lamp in the ª button lights
up or goes out.
Problems with the rear window
defroster
If the indicator lamp in the ª rear window
defroster button flashes, the on-board
voltage is too low or the roof is open. The rear
window defroster has deactivated itself
prematurely or cannot be activated.
XSwitch off any consumers that are not
required, e.g. reading lamps or interior
lighting.
When the battery is sufficiently charged,
the rear window defroster is activated
again automatically.19 Depending on the outside temperature.
20 Canada only.Operating the climate control system143Climate controlZ