climate control MERCEDES-BENZ CLS 2012 User Guide

Control panel for dual-zone automatic climate control
Canada only
:To set the temperature, left (Y page 123);To defrost the windshield ( Y page 125)=To switch the ZONE function on/off ( Y page 125)?To activate/deactivate cooling with air dehumidification ( Y page 122)ATo switch the rear window defroster on/off ( Y page 126)BTo set the temperature, right ( Y page 123)CTo activate/deactivate air-recirculation mode ( Y page 126)DTo set the air distribution ( Y page 124)ETo increase the airflow ( Y page 124)FTo reduce the airflow ( Y page 124)GTo switch climate control on/off ( Y page 122)HTo set climate control to automatic ( Y page 123)Overview of climate control systems119Climate controlZ

USA only
:To set the temperature, left (Y page 123);To defrost the windshield ( Y page 125)=To switch maximum cooling MAX COOL on/off ( Y page 125)?To activate/deactivate cooling with air dehumidification ( Y page 122)ATo switch the rear window defroster on/off ( Y page 126)BTo set the temperature, right ( Y page 123)CTo activate/deactivate air-recirculation mode ( Y page 126)DTo set the air distribution ( Y page 124)ETo increase the airflow ( Y page 124)FTo reduce the airflow ( Y page 124)GTo switch climate control on/off ( Y page 122)HTo set climate control to automatic ( Y page 123)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
¿ buttons. The indicator lamps in the
à and ¿ 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 ZONE function to adopt the
temperature settings on the driver's side
for the front-passenger side as well. The
indicator lamp in the á button goes out.120Overview of climate control systemsClimate control

Control panel for 3-zone automatic climate control
Canada only
:To set the temperature, left (Y page 123);To defrost the windshield ( Y page 125)=To activate/deactivate the residual heat function ( Y page 127)?To activate/deactivate cooling with air dehumidification ( Y page 122)ATo switch the rear window defroster on/off ( Y page 126)BTo set the temperature, right ( Y page 123)CTo switch the ZONE function on/off ( Y page 125)DTo switch climate control on/off ( Y page 122)ETo set the air distribution ( Y page 124)FTo increase the airflow ( Y page 124)GTo reduce the airflow ( Y page 124)HTo adjust the climate control settings (AIR FLOW) ( Y page 123)ITo activate/deactivate air-recirculation mode ( Y page 126)JTo set climate control to automatic ( Y page 123) Rear control panelKTo increase the airflow ( Y page 124)LTo reduce the airflow ( Y page 124)MDisplayNTo reduce the temperature ( Y page 123)OTo increase the temperature ( Y page 123)Overview of climate control systems121Climate controlZ

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
¿ buttons. The indicator lamps in the
à and ¿ buttons light up.
R In automatic mode, you can also use the
ñ button to set a climate mode
(FOCUS/MEDIUM/DIFFUSE). The
MEDIUM level is recommended.
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 ZONE function to adopt the
temperature settings on the driver's side
for the front-passenger side and the rear
compartment as well. The indicator lamp in
the á button goes out.
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 123).
Activating/deactivatingXTurn 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 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.
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.
122Operating the climate control systemClimate control

iThe cooling with air dehumidification
function uses refrigerant R134a. This
coolant does not contain
chlorofluorocarbons, and therefore does
not damage the ozone layer.
Activating/deactivatingXTo activate: press the ¿ button.
The indicator lamp in the ¿ button lights
up.XTo switch off: press the ¿ button.
The indicator lamp in the ¿ button goes
out. The cooling with air dehumidification
function has a delayed switch-off feature.
Problems with the cooling with air
dehumidification function
When you press the ¿ button, the
indicator lamp in the button flashes three
times or remains off. 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.
Adjusting the climate mode settings
(AIR FLOW)
This function is only available with automatic
climate control.
The climate control settings are especially
effective at high temperatures.
You can select the following climate control
settings in automatic mode:FOCUShigh airflow that is set slightly
coolerMEDIUMmedium airflow, standard settingDIFFUSElow airflow that is set slightly
warmer and with a lower rate of
airflowXTurn the SmartKey to position 2 in the
ignition lock.XPress the à button.XPress the ñ button repeatedly until the
desired climate mode appears in the
display.
Setting the temperature
Dual-zone automatic climate control
Different temperatures can be set for the
driver's and front-passenger sides.
XTurn the SmartKey to position 2 in the
ignition lock.XTo increase/reduce: turn controls : and
B clockwise or counter-clockwise
( Y page 119).
Only change the temperature setting in
small increments. Start at 72 ‡ (22 † ).Operating the climate control system123Climate controlZ

3-zone automatic climate control
Automatic climate control climate zones
You can select different temperature settings
for the driver's and front-passenger sides as
well as for the rear compartment.
XTurn the SmartKey to position 2 in the
ignition lock.XTo increase/reduce the temperature in
the front: turn controls : and B
clockwise or counter-clockwise
( Y page 121).
Only change the temperature setting in
small increments. Start at 72 ‡ (22 † ).XTo increase/reduce the temperature in
the rear compartment using the front
control panel: press the á button.
The indicator lamp in the á button goes
out.XTurn control : clockwise or counter-
clockwise ( Y page 121).
Only change the temperature setting in
small increments. Start at 72 ‡ (22 † ).
The temperature setting for the driver's
side is adopted for the rear compartment
and the front-passenger side.XTo increase/reduce the temperature in
the rear compartment using the rear
control panel: press the r or s
button on the rear control panel.
Only change the temperature setting in
small increments. Start at 72 ‡ (22 † ).i If you leave the vehicle parked for longer
than 30 minutes, the temperature setting
for the rear compartment then switches
back to 72 ‡.
Setting the air distribution
PDirects the airflow through the center
and side air ventsODirects the airflow through the
footwell air ventsSDirects the airflow through the center
and side air vents as well as the
footwell air vents¯Directs the airflow through the
defroster ventsbDirects the airflow through the
defroster, center and side air vents. 11aDirects the airflow through the
footwell and defroster vents_Directs the airflow through the
defroster, center and side air vents as
well as the footwell air vents 11
i
Regardless of the air distribution setting,
airflow is always directed through the side
air vents. The side air vents can only be
closed when the controls on the side air
vents are turned downwards.
XTurn the SmartKey to position 2 in the
ignition lock.XPress the _ button repeatedly until the
desired symbol appears in the display.
Setting the airflow
XTurn the SmartKey to position 2 in the
ignition lock.XTo increase: press the K button.XTo reduce: press the I button.11
Canada only.124Operating the climate control systemClimate control

iYou can use automatic climate control to
set the airflow in the rear compartment
separately.
Switching the ZONE function on/off
XTo switch on: press the á button.
The indicator lamp in the á button lights
up.
Dual-zone automatic climate control: the
temperature setting for the driver's side is
not adopted for the front-passenger side.
3-zone automatic climate control: the
temperature setting for the driver's side is
not adopted for the front-passenger side
and the rear compartment.
When the buttons or controls for
temperature, airflow or air distribution are
activated, the temperature setting for the
driver's side is not adopted for the other
climate control zones.
XTo switch off: press the á button.
The indicator lamp in the á button goes
out.
Dual-zone automatic climate control: the
temperature setting for the driver's side is
adopted for the front-passenger side.
3-zone automatic climate control: the
temperature setting for the driver's side is
adopted for the front-passenger side and
the rear compartment.
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.
The climate control system switches to the
following functions:
R cooling with air dehumidification on
R high airflow 12
R high temperature 12
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 à button.
The indicator lamp in the ¬ button goes
out. Airflow and air distribution are set to
automatic mode.
or
XTurn controls : or B clockwise or
counter-clockwise ( Y page 119),
( Y page 121).
or
XPress the K or I button.
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.
12 Depending on the outside temperature.Operating the climate control system125Climate controlZ

When you activate MAX COOL, climate
control switches to the following functions:
R maximum cooling
R maximum airflow
R air-recirculation mode onXTo activate: press the Ù button.
The indicator lamp in the button lights up.XTo 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
XActivate the ¿ cooling with air
dehumidification function.XActivate automatic mode Ã.XIf the windows continue to fog up, activate
the defrosting function ( Y page 125).
i
You should only select this setting until
the windshield is clear again.
Windows fogged up on the outside
XSwitch on the windshield wipers.XPress 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
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 ¤ button.
The indicator lamp in the ¤ button 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
from outside. The air already inside the
vehicle will then be recirculated.
The operation of air-recirculation mode is the
same for all control panels.
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.
126Operating the climate control systemClimate control

XTurn the SmartKey to position 2 in the
ignition lock.XTo activate: press the g button.
The indicator lamp in the g button lights
up.
i In the event of high pollution levels 13
or at
high outside temperatures, air-
recirculation mode is automatically
activated. When air-recirculation mode is
activated automatically, the indicator lamp
in the g button is not lit.
Outside air is added after about 30
minutes.
XTo switch off: press the g button.
The indicator lamp in the g button 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
The residual heat function is only available in
vehicles for Canada with automatic climate
control.
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 button.
The indicator lamp in the Ì button lights
up.XTo switch off: press the Ì button.
The indicator lamp in the Ì button 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.
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.
13 Automatic climate control only.Setting the air vents127Climate controlZ

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 inlet between the windshield
and the hood free of blockages, such as ice,
snow or leaves.
R never cover the vents or air inlet and outlet
grilles 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
:Center air vent, left;Center air vent, right=Center vent thumbwheel, right?Center vent thumbwheel, leftXTo open/close: turn thumbwheels =
and ? up or down.
Setting the side air vents
XTo 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 glove box air vent
When automatic climate control is activated,
the glove box can be ventilated, for instance
to cool its contents. The level of airflow
depends on the airflow and air distribution
settings.
! Close the air vent when heating the
vehicle.
At high outside temperatures, open the air
vent and activate the "cooling with air
dehumidification" function. Otherwise,
temperature-sensitive items stored in the
glove box could be damaged.
:Air vent thumbwheel;Air ventXTo open/close: turn thumbwheel :
clockwise or counter-clockwise.128Setting the air ventsClimate control