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Information about using
THERMOTRONIC automatic climate
control
Automatic climate control The following contains instructions and rec-
ommendations to enable you to get the most
out of your THERMOTRONIC automatic cli-
mate control.
R Activate climate control using the Ãand
¿ buttons. The indicator lamps above
the à and¿ buttons light up.
R In automatic mode, you can also use the
ñ button to adjust airflow (FOCUS/
MEDIUM/DIFFUSE). The MEDIUM level is
recommended.
R Set the temperature to 22 †.
R Only use the "Windscreen demisting" func-
tion briefly until the windscreen is clear
again.
R Only use air-recirculation mode briefly, e.g.
if there are unpleasant outside odours or
when in a tunnel. The windows could oth-
erwise mist up as no fresh air is drawn into
the vehicle in air-recirculation mode.
R Use the ZONE function to adopt the tem-
perature settings on the driver's side for
the front-passenger side and the rear com-
partment as well. The indicator lamp above
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 deac- tivated with the ignition switched off.
R Vehicles with COMAND Online: if you
change the settings of the climate control
system, the climate status display appears for approximately three seconds at the bot-
tom of the screen in the COMAND display. See also the separate COMAND Online
operating instructions. You will see the cur- rent settings of the various climate controlfunctions. ECO start/stop function During automatic engine switch-off, the cli-
mate control only operates at a reduced capa-
city. If you require the full climate control out-
put, you can switch off the ECO start/stop
function by pressing the ECO button
(Y page 164). Operating the climate control system
Switching climate control on/off
General notes When the climate control is switched off, the
air supply and air circulation are also
switched off. The windows could mist up.
Therefore, only switch off climate control
briefly.
i Activate climate control primarily using
the à button (Y page 144).
Switching on/off X
Turn the key to position 2in the ignition
lock (Y page 159).
X To switch on: press theÃbutton on
the control panel for the climate control.
The indicator lamp in the Ãbutton lights
up. Airflow and air distribution are set to
automatic mode.
or X Press the ^button.
The indicator lamp in the ^button goes
out. The previous settings are reactivated.
X To switch off: press the^button.
The indicator lamp in the ^button lights
up. 142
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rol
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Activating/deactivating the cooling
with air dehumidification function
General notes If you deactivate the "Cooling with air-dehu-
midification" function, the air inside the vehi- cle will not be cooled. The air inside the vehi-
cle will also not be dehumidified. The win-
dows can mist up more quickly. Therefore,
only switch off cooling with air dehumidifica-
tion for a short period.
The cooling with air dehumidification function is only available when the engine is running.
The air inside the vehicle is cooled and dehu-midified according to the temperature selec-
ted.
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 mal-
function.
Activating/deactivating X
To activate: press the¿button.
The indicator lamp in the ¿button lights
up.
i In vehicles with auxiliary heating, one of
the indicator lamps on the auxiliary heating
button lights up when the "cooling with air
dehumidification" function is activated.
X To deactivate: press the¿button.
The indicator lamp in the ¿button goes
out. The "Cooling with air dehumidification"
function has a delayed switch-off feature. Operating the climate control system
143Climate control
Page 147 of 417

Problems with the "Cooling with air dehumidification" function
Problem
Possible causes/consequences and
M
MSolutions The indicator lamp in
the
¿ button
flashes three times or
remains off. The cool-
ing with air dehumidifi-
cation system cannot
be switched on. Cooling with air dehumidification has been deactivated due to a
malfunction.
X Visit a qualified specialist workshop. Setting climate control to automatic
mode
General notes In automatic mode, the set temperature is
maintained automatically at a constant level.
The system automatically regulates the tem-
perature of the dispensed air, the airflow and
the air distribution.
The automatic mode functions optimally
when the "Cooling with air dehumidification"
function is activated. If desired, cooling with
air dehumidification can be deactivated.
If you deactivate the "Cooling with air-dehu-
midification" function, the air inside the vehi-
cle will not be cooled. The air inside the vehi- cle will also not be dehumidified. The win-
dows can mist up more quickly. Therefore,
only switch off cooling with air dehumidifica-
tion for a short period.
Activating/switching X
Turn the key to position 2in the ignition
lock (Y page 159).
X Set the desired temperature.
X To activate: press theÃbutton.
The indicator lamp in the Ãbutton lights
up. Automatic air distribution and airflow
are activated.
i THERMOTRONIC automatic climate con-
trol: when automatic mode is activated, you can set the climate mode (Y page 144).X
To switch to manual mode: press the
_ button.
or X Press the IorK button.
The indicator lamp in the Ãbutton goes
out. Setting the climate mode
The "Set climate mode" function is only avail-
able with THERMOTRONIC automatic climate control.
In automatic mode you can select the follow-
ing climate modes:
FOCUS high airflow that is set slightly cooler
MEDIUM medium airflow, standard setting
DIFFUSE low airflow that is set slightly warmer and with less of a draught
X Turn the key to position 2in the ignition
lock (Y page 159).
X Press the Ãbutton.
X Press the ñbutton repeatedly until the
desired climate mode appears in the dis-
play. 144
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Setting the temperature
THERMATIC automatic climate control Different temperatures can be set for the
driver's and front-passenger sides.
X Turn the key to position 2in the ignition
lock (Y page 159).
X To increase/reduce: turn temperature
control :orB clockwise or anti-clock-
wise (Y page 139).
Only change the temperature setting in
small increments. Start at 22 †.
THERMOTRONIC automatic climate
control THERMOTRONIC automatic climate control zones
You can select different temperature settings for the driver's and front-passenger sides as
well as for the rear compartment.
X Turn the key to position 2in the ignition
lock (Y page 159).
X To increase/reduce the temperature in
the front compartment: turn temperature
control :orB clockwise or anti-clock-
wise (Y page 141).
Only change the temperature setting in
small increments. Start at 22 †.
X To increase/reduce the temperature in
the rear compartment using the front
control panel: press theábutton.
The indicator lamp in the ábutton goes
out. X
Turn temperature control :clockwise or
anti-clockwise (Y page 141).
Only change the temperature setting in
small increments. Start at 22 †.
The temperature setting for the driver's
side is adopted for the rear compartment
and the front-passenger side.
X To increase/reduce the temperature in
the rear compartment using the rear
control panel: press therors
button on the rear control panel.
Only change the temperature setting in
small increments. Start at 22 †. Setting the air distribution
Air distribution settings P
Directs the airflow through the centre
and side air vents
O Directs the airflow through the foot-
well air vents
S Directs the airflow through the centre
and side air vents as well as the foot-
well air vents
¯ Directs the airflow through the demis-
ter vents
b Directs the airflow through the demis-
ter, centre and side air vents (only for
certain countries)
a Directs the airflow through the foot-
well and demister vents
_ Directs the airflow through the demis-
ter vents, the centre and side air vents as well as the footwell air vents
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. Operating the climate control system
145Climate control
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Setting the air distribution
X
Turn the key to position 2in the ignition
lock (Y page 159).
X Press the _button repeatedly until the
desired symbol appears in the display. Setting the airflow
X Turn the key to position 2in the ignition
lock (Y page 159).
X To increase: press theKbutton.
X To reduce: press theIbutton.
i You can use THERMOTRONIC automatic
climate control to set the airflow in the rear compartment separately.
If the battery is not charged sufficiently, the
blower output may be reduced. Once the bat-
tery is sufficiently charged again, full blower
output will be available. Switching the ZONE function on/off
X To switch on: press theábutton.
The indicator lamp above the ábutton
lights up.
THERMATIC automatic climate control: the temperature setting for the driver's side is
not adopted for the front-passenger side.
THERMOTRONIC automatic climate con-
trol: the temperature setting for the driver's
side is not adopted for the front-passenger
side and the rear compartment.
X To switch off: press theábutton.
The indicator lamp above the ábutton
goes out.
THERMATIC automatic climate control: the
temperature setting for the driver's side is
adopted for the front-passenger side.
THERMOTRONIC automatic climate con-
trol: 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 defrost the wind-
screen or to demist the inside of the wind-
screen and the side windows.
Switch off the windscreen demisting function
as soon as the windscreen is clear again.
X Turn the key to position 2in the ignition
lock (Y page 159).
X To activate: press the¬button.
The indicator lamp in the ¬button lights
up.
The climate control system switches to the
following functions:
R high airflow
R high temperature
R air distribution to the windscreen and
front side windows
R air-recirculation mode off
If the battery is not charged sufficiently, the
blower output may be reduced. Once the bat- tery is sufficiently charged again, full blower
output will be available again.
X To deactivate: press the¬button.
The indicator lamp in the ¬button goes
out. The previous settings are reactivated.
Air-recirculation mode remains deactiva-
ted.
or
X Press the Ãbutton.
The indicator lamp in the ¬button goes
out. Airflow and air distribution are set to
automatic mode.
or
X THERMATIC automatic climate control:
turn temperature controls :orB clock-
wise or anti-clockwise (Y page 139).
THERMOTRONIC automatic climate con-
trol: turn temperature controls :orB
clockwise or anti-clockwise (Y page 141).
or X Press the KorI button. 146
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Demisting the windows
Windows misted up on the inside X
Activate the ¿cooling with air dehu-
midification function.
X Activate automatic mode Ã.
X Adjust the side air vents so that the heated
air is directed towards the side windows.
X If the windows continue to mist up, activate
the "Windscreen demisting" function ¬.
i You should only select this setting until
the windscreen is clear again.
Windows misted up on the outside X
Press the _button repeatedly until the
P orO symbol appears in the dis-
play.
X Adjust the side air vents so that no air is
directed towards the side windows. Rear window heating
General notes 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.
Activating/deactivating X
Turn the key to position 2in the ignition
lock (Y page 159).
X Press the ¤button.
The indicator lamp in the ¤button lights
up or goes out. Operating the climate cont
rol system
147Climate cont rol
Page 151 of 417

Problems with the rear window heating
Problem
Possible causes/consequences and
M
MSolutions The rear window heat-
ing has switched off
prematurely or cannot
be activated. The battery has not been sufficiently charged.
X Switch off any consumers that are not required, e.g. reading
lamps, interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window heat- ing can be activated again. Activating/deactivating air-recircula-
tion mode
General notes 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.
If you switch on air-recirculation mode, the
windows can mist up more quickly, in partic-
ular at low temperatures. Only use air-recir-
culation mode briefly to prevent the windows misting up.
The operation of air-recirculation mode is thesame for all control panels.
Activating/deactivating X
Turn the key to position 2in the ignition
lock (Y page 159).
X To activate: press thegbutton.
The indicator lamp in the gbutton lights
up.
i THERMATIC automatic climate control:
air-recirculation mode is activated auto-
matically at high outside temperatures.
THERMOTRONIC automatic climate con-
trol: air-recirculation mode is automatically
activated at high levels of pollution or at
high outside temperatures.
When air-recirculation mode is activated
automatically, the indicator lamp above the g
button does not light up. Outside air is
added after about 30 minutes.
X To deactivate: press thegbutton.
The indicator lamp in the gbutton goes
out.
i Air-recirculation mode is deactivated
automatically:
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 † if the cooling with air dehumidifica-
tion function is activated Convenience opening/closing using
the air-recirculation button G
WARNING
When the convenience closing feature is oper- ating, parts of the body could become trapped
in the closing area of the side window and the
sliding sunroof. There is a risk of injury.
Observe the complete closing procedure
when the convenience closing feature is oper-
ating. When closing make sure that no parts of the body are in the closing area. G
WARNING
During convenience opening parts of the body could be drawn in or become trapped 148
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between the side window and window frame.
There is a risk of injury.
When opening, make sure that nobody is
touching the side window. If someone
becomes trapped, press the Wswitch
immediately to open/close the side window
in the door. The side window stops. To con-
tinue closing the side window, pull on the
W switch.
X Convenience closing feature: press and
hold the gbutton until the side win-
dows and the sliding sunroof are closed.
The indicator lamp in the gbutton lights
up. Air-recirculation mode is activated.
If parts of the body are in the closing area
during convenience closing, proceed as fol-
lows:
X Press the Wbutton for opening/closing
the side windows.
The side windows stop.
X To then open the side windows, press the
W button again.
X Press the 3button to open/close the
sliding sunroof.
The sliding sunroof stops.
X To then open the sliding sunroof, pull back
on the 3button.
i Notes on the automatic reversing feature
for:
R the side windows (Y page 96)
R the sliding sunroof (Y page 100)
X Convenience opening feature: press and
hold the gbutton until the side win-
dows and the sliding sunroof have opened. The side windows and the sliding sunroof
move back to their original position.
The indicator lamp in the gbutton goes
out. Air-recirculation mode is deactivated.
i If you open the side windows or the sliding
sunroof manually after closing with the
convenience closing feature, they will
remain in this position when opened using
the convenience opening feature. Activating/deactivating the residual
heat function
General notes The residual heat function is only available
with THERMOTRONIC automatic climate con- trol.
It is possible to make use of the residual heat
of the engine to continue heating the vehicle
for approximately 30 minutes after the engine
has been switched off. The heating time
depends on the temperature that has been
set for the vehicle interior.
Activating/deactivating X
Turn the key to position 0in the ignition
lock or remove it (Y page 159).
X To activate: press theÌbutton.
The indicator lamp in the Ìbutton lights
up.
i If the residual heat function is activated,
the windows may mist up on the inside.
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. The blower runs at
medium speed.
X To deactivate: press theÌbutton.
The indicator lamp in the Ìbutton goes
out.
Residual heat is deactivated automatically: R after approximately 30 minutes
R when the ignition is switched on
R if the battery voltage drops
R when the auxiliary heating is switched on Operating the climate control system
149Climate control Z