2012 MERCEDES-BENZ CL-Class Owner's Manual

Useful information ............................256
Overview of climate control sys-
tems ................................................... 256
Operating the climate control sys-
tem ..................................................... 257
Setting the air vents .........................261255Climate control

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 29).
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 controls the
temperature and the humidity in the vehicle
interior and filters undesirable substances
from the air.
The automatic climate control is only
operational when the engine is running 13
.
Optimum operation is only achieved when
you drive with the side windows and the
sliding sunroof closed.
You can also set some automatic climate
control functions via COMAND (Y page 235).
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature ( Y page 87).
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.
i It is possible that the blower may be
activated automatically 40 minutes after
the SmartKey is removed. The vehicle is
then ventilated for 30 minutes to dry the
air-conditioning system.13 The residual heat function can only be activated/deactivated if the ignition is switched off.256Overview of climate control systemsClimate control

Automatic climate control panel:Sets climate control to automatic mode, left (Y page 258);Sets the temperature, left ( Y page 259)=Sets the airflow, left ( Y page 259)?Defrosts the windshield ( Y page 259)AActivates/deactivates air-recirculation mode ( Y page 260)BSwitches climate control on /off( Y page 257)CSwitches the residual heat function on/off( Y page 261)DSwitches the rear window defroster on/off ( Y page 260)ESets the airflow, right ( Y page 259)FSets the temperature, right ( Y page 259)GSets climate control to automatic mode, right ( Y page 258)Notes on using climate control
Below, you can find a number of notes and
recommendations to help you use climate
control optimally.
R Activate climate control using the Ã
rocker switch. The indicator lamp in the
à rocker switch lights 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 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 beactivated 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 rocker switch ( Y page 258).
Operating the climate control system257Climate controlZ

Activating/deactivatingXTurn the SmartKey to position 2 in the
ignition lock.XTo activate: press the ^ rocker switch
up or down.
The indicator lamp in the rocker switch
goes out. The previously selected settings
come into effect again.XTo deactivate: press the ^ rocker
switch up or down.
The indicator lamp in the rocker switch
lights up.
Activating/deactivating the cooling
with air dehumidification function
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.
You can activate or deactivate the cooling
with air dehumidification function via
COMAND ( Y page 237).
i The cooling with air dehumidification
function uses refrigerant R134a. This
coolant does not contain
chlorofluorocarbons, and therefore does
not damage the ozone layer.
Problems with the cooling with air
dehumidification function
If you can no longer switch on the cooling with
air dehumidification function via COMAND,
the cooling with air dehumidification function
is switched off due to a malfunction.
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.
XTurn the SmartKey to position 2 in the
ignition lock.XSet the desired temperature.X To switch on: press the à rocker
switch up or down.
The indicator lamp in the à rocker
switch lights up.XTo deactivate: press the K rocker
switch up or down.
The indicator lamp in the à rocker
switch goes out.
or
XSet the air distribution using COMAND
( Y page 236).
The indicator lamp in the à rocker
switch goes out.258Operating the climate control systemClimate control

Setting the temperature
Climate control climate zones
You can select different temperature settings
for the driver's and front-passenger sides as
well as for the footwells.
XTurn the SmartKey to position 2 in the
ignition lock.XTo increase/reduce: press the w
rocker switch up or down.
Only change the temperature setting in
small increments. Start at 72 ‡ (22 †).
i You can also use COMAND to set the
temperature ( Y page 235).
i The footwell temperature can be set via
COMAND ( Y page 238).
Setting the air distribution
Air distribution settings
The air distribution can be set individually for
the driver's and front-passenger sides.
¯Directs air through the defroster ventsPDirects air through the center and side
air ventsODirects the airflow through the
footwell air ventsSDirects air through the center, side and
footwell ventsaDirects air through the defroster and
footwell vents_Directs air through the defroster,
center, side and footwell ventsbDirects air through the defroster,
center and side air ventsWSets the air distribution to automatic
The air distribution can be set using COMAND
( Y page 236).
Setting the airflow
You can select different airflow settings for
the driver's and front-passenger sides.
XTurn the SmartKey to position 2 in the
ignition lock.XTo increase/reduce: press the K
rocker switch up or down.
You can also use COMAND to set the airflow
( Y page 236).
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 switch on: press the ¬ rocker
switch up or down.
The indicator lamp in the ¬ rocker
switch lights up.
The climate control system switches to the
following functions:
R cooling with air dehumidification on
R high airflow 14
R high temperature 14
R air distribution to the windshield and
front side windows
R air-recirculation mode off14Depending on the outside temperature.Operating the climate control system259Climate controlZ

XTo deactivate: press the ¬ rocker
switch up or down.
The indicator lamp in the ¬ rocker
switch 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 w rocker switch up or down.
or
XPress the K rocker switch up or down.
MAX COOL maximum cooling
The MAX COOL function is only available in
vehicles for the USA.
MAX COOL is only operational when the
engine is running.
The MAX COOL function is activated
automatically:
R if climate control is set to automatic
( Ã ) on both sides
R if additional cooling is used
The display shows MAX COOL.
This is the quickest way to cool the vehicle
interior when the sliding sunroof and the side
windows are closed.
Defrosting the windows
Windows fogged up on the inside
XActivate the cooling with air
dehumidification function via COMAND
( Y page 237).XActivate automatic mode Ã.XIf the windows continue to fog up, activate
the defrosting function ( Y page 259).
i
You should only select this setting until
the windshield is clear again.
Windows fogged up on the outsideXSwitch on the windshield wipers.XActivate automatic climate control.
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 ¤ rocker switch up or down.
The indicator lamp in the ¤ rocker
switch lights up or goes out.
Problems with the rear window
defroster
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.
Activating/deactivating air-
recirculation mode
You can deactivate the flow of fresh air if
unpleasant odors are entering the vehicle
260Operating the climate control systemClimate control

from outside. The air already inside the
vehicle will then be recirculated.GWARNING
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 the ¬
button.
XTurn the SmartKey to position 2 in the
ignition lock.XTo activate: press the g rocker switch
up or down.
The indicator lamp in the g rocker
switch lights up.
i Air-recirculation mode is activated
automatically at high outside
temperatures. The indicator lamp in the
g rocker switch is not lit when
automatic air-recirculation mode is
activated.
Outside air is added after about 30
minutes.
X To deactivate: press the g rocker
switch up or down.
The indicator lamp in the g rocker
switch goes out.
i Air-recirculation mode deactivates
automatically:
R after approximately five minutes if
outside temperatures are less than about
41 ‡ (5 †)
R after approximately five minutes if
cooling with air dehumidification is
deactivated
R after approximately 30 minutes if outside
temperatures are over about
41 ‡ (5 †)
Activating/deactivating the residual
heat function
It is possible to make use of the residual heat
of the engine to continue heating the
stationary vehicle for up to 30 minutes after
the engine has been switched off. The heating
time depends on the temperature that has
been set.
i The blower will run at a low speed
regardless of the airflow setting.
i If you activate the residual heat function
at high temperatures, only the ventilation
will be activated. The blower runs at
medium speed.XTurn the SmartKey to position 0 in the
ignition lock or remove it.XTo activate: press the Ì rocker switch
up or down.
The indicator lamp in the Ì rocker
switch lights up.XTo deactivate: press the Ì rocker
switch up or down.
The indicator lamp in the Ì rocker
switch goes out.
i Residual heat is deactivated
automatically:
R after about 30 minutes
R when the ignition is switched on
R if the battery voltage drops
R if the coolant temperature is too low
Setting the air vents
Important safety notes
GWARNING
When operating the climate control, the air
that enters the passenger compartment
through the air vents can be very hot or very
cold (depending on the set temperature). This
could cause burns or frostbite to unprotected
skin in the immediate area of the air vents.
Setting the air vents261Climate controlZ

Always keep sufficient distance between
unprotected parts of the body and the air
vents. If necessary, use the air distribution
adjustment to direct the air to air vents in the
vehicle interior that are not in the immediate
area of unprotected skin.
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior,
please observe the following notes:
R keep the air intake grille on the hood free
of blockages, such as ice, snow or leaves
R never cover the air vents or air intake grille
in the vehicle interior.
i For virtually draft-free ventilation, adjust
the sliders of the air vents to the center
position.
Setting the center air vents
:Fixed center air vent;Center air vent, right=Center vent thumbwheel, right?Center vent thumbwheel, leftACenter air vent, leftXTo open/close: turn thumbwheels =
and ? up or down.Setting the side air ventsXTo open/close: turn thumbwheel = up or
down.
i Side window defroster vent : is never
completely shut, even if side air vent ; is
shut.
Setting the air vents in the stowage
compartment
When automatic climate control is activated
the stowage compartment can be ventilated,
for instance to cool its contents. The level of
airflow depends on the airflow and air
distribution settings. The temperature of the
air is approximately the same as that of the
air flowing from the center air vents.
! Close the stowage compartment air vent
when heating mode is activated and
activate "cooling with air dehumidification"
if the outside temperature is high.
Otherwise, temperature-sensitive items
stored in the stowage compartment could
be damaged.
262Setting the air ventsClimate control