key MERCEDES-BENZ C-CLASS SALOON 2014 Repair Manual

mode. If necessary, activate this function
(Y
page 157).
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 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. The
residual heat function is deactivated when
the ignition is switched on.
AGILITY SELECT switch You can choose between various drive pro-
grams with the AGILITY SELECT switch.
R Manual transmission (Y page 191)
R Automatic transmission (Y page 197)
If you have selected drive program E, the cli-
mate control switches to Eco mode.
In Eco mode:
R the cooling output is reduced when cooling
R when heating, the electrical heater booster
is deactivated and heat output is reduced
as a result
R the rear window heating running time is
reduced
If you have selected drive program C,Sor S+
the climate control switches to Comfort
mode. The current climate control settings
are maintained in Comfort mode.
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 187).
Hybrid vehicles The cooling with air dehumidification function
is available when the vehicle is operational
and the READY indicator is lit (Y page 276).
If the internal combustion engine has been
shut off automatically, the set interior tem-
perature will be maintained for a certain
period of time. 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.
Switch on climate control primarily using the à rocker switch (Y page 159).
Activating/deactivating X
Turn the key to position 2in the ignition
lock (Y page 181).
X To switch on: press thet/!
rocker switch up or down.
The Audio 20/COMAND Online climate
control menu opens.
X Activate the climate control using the air-
conditioning function bar; see the separate
Audio 20/COMAND Online operating
instructions.
or
X Set the airflow to level 1 or higher using the
H button. 156
Operating the climate control systemClimate control

Automatic control
X
Turn the key to position 2in the ignition
lock (Y page 181).
X Set the desired temperature using the
w rocker switch on the front control
unit.
or X Set the desired temperature using
Audio 20/COMAND Online; see the sepa-
rate operating instructions.
X To activate: press theÃrocker switch
up or down.
The indicator lamp above the Ãrocker
switch lights up.
X To switch to manual operation: press the
H rocker switch up or down.
or
X Set the airflow using Audio 20/COMAND
Online; see the separate operating instruc-
tions.
or
X Press the upper or lower section of the
_ rocker switch.
or X Set the air distribution using Audio 20/
COMAND Online; see the separate operat-
ing instructions.
The indicator lamp above the Ãrocker
switch goes out.
In automatic mode, if you adjust the airflow or air distribution manually, the indicator lamp
above the Ãrocker switch goes out. The
function which has not been changed man-
ually, however, continues to be controlled
automatically. When the manually set func-
tion switches back to automatic mode, the
indicator lamp above the Ãrocker switch
lights up again. Setting the climate mode
This function is only available with
THERMOTRONIC automatic climate control. In automatic mode you can select the follow-
ing airflow settings for the driver's and front-
passenger areas:
FOCUS high airflow that is set slightly cooler
MEDIUM medium airflow, standard setting
DIFFUS Elow airflow that is set slightly
warmer and with less of a draught
X To set: set the climate mode using Audio
20/COMAND Online (see separate operat-
ing instructions). 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 181).
X To increase/reduce: press the upper or
lower section of the wrocker switch.
or
X Set the temperature using Audio 20/
COMAND Online; see the separate operat-
ing instructions.
Only change the temperature setting in
small increments. Start at 22 †.
THERMOTRONIC automatic climate
control General notes
THERMOTRONIC automatic climate control zones160
Operating the climate control systemClimate control

You can select different temperature settings
for the driver's and front-passenger sides as
well as for the rear compartment.
Setting the temperature in the front com-
partment using the front control panel
X Turn the key to position 2in the ignition
lock (Y page 181).
X To increase/reduce: press the upper or
lower section of the wrocker switch.
or X Set the temperature using Audio 20/
COMAND Online; see the separate operat-
ing instructions.
Only change the temperature setting in
small increments. Start at 22 †.
Setting the temperature in the rear com-
partment using the front control panel
X Turn the key to position 2in the ignition
lock (Y page 181).
X Set the temperature with the wrocker
switch on the front control panel.
or X Set the temperature using Audio 20/
COMAND Online; see the separate operat-
ing instructions.
Only change the temperature setting in
small increments. Start at 22 †.
X Press the upper or lower section of
the ! rocker switch.
The climate control menu in Audio 20/
COMAND Online opens.
X Select the synchronisation function; see
separate Audio 20/COMAND Online oper-
ating instructions.
The temperature setting for the driver's
side is adopted for the front-passenger side
and the rear compartment. Setting the temperature in the rear com-
partment using the rear control panel
X Turn the key to position 2in the ignition
lock (Y page 181).
X To increase/reduce: press the upper or
lower section of the wrocker switch on
the rear control panel (Y page 154).
Only change the temperature setting in
small increments. Start at 22 †.
The set temperature appears on the rear-
compartment display. Setting the air distribution
Air distribution settings ¯
Directs the airflow through the demis-
ter vents
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
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
b Directs the airflow through the centre
and side air vents as well as the demis-
ter vents
W Sets the air distribution to automatic
Setting THERMOTRONIC automatic climate control:
you can set the air distribution separately for
the driver's and front-passenger side.
X Turn the key to position 2(Y page 181).
X Press the _button up or down.
The various air distribution settings appear in Audio 20/COMAND Online. Operating the climate control system
161Climate control

X
Press and hold the _button upwards
until the desired position is reached.
or X Set the air distribution using Audio 20/
COMAND Online; see the separate operat-
ing instructions. Setting the airflow
THERMATIC automatic climate control X
Turn the key to position 2in the ignition
lock (Y page 181).
X To increase/reduce: press the upper or
lower section of the Hrocker switch.
or
X Set the airflow using Audio 20/COMAND
Online; see the separate operating instruc-
tions.
THERMOTRONIC automatic climate
control Setting the front-compartment airflow
You can set the airflow separately for the
front and rear compartment. X Turn the key to position 2in the ignition
lock (Y page 181).
X To increase/reduce: press the upper or
lower section of the Hrocker switch.
or
X Set the airflow using Audio 20/COMAND
Online; see the separate operating instruc-
tions.
Setting the rear compartment airflow X Turn the key to position 2in the ignition
lock (Y page 181).
X Press the upper or lower section of
the ! rocker switch.
The Audio 20/COMAND Online climate
control menu opens.
X Select the synchronisation function in the
climate control menu; see separate Audio 20/COMAND Online operating
instructions.
The airflow setting for the front area is
adopted for the rear compartment.
Setting the rear compartment airflow
using the rear control panel
X Turn the key to position 2in the ignition
lock (Y page 181).
X To increase/reduce: press the upper or
lower section of the K/Irocker
switch on the rear control panel.
The selected airflow level is shown in the
rear-compartment display. Activating/deactivating the synchro-
nisation function
General notes Climate control can be set centrally using the
synchronisation function. The temperature
setting is adopted for the front-passenger
side. For THERMOTRONIC automatic climatecontrol, the temperature setting is adopted
for the front-passenger side and rear com-
partment.
Activating/deactivating THERMATIC automatic climate control
without auxiliary heating
X Press the 0rocker switch up or down.
The indicator lamp in the 0rocker
switch lights up or goes out.
or
X Activate/deactivate the synchronisation
function using Audio 20/COMAND Online;
see the separate operating instructions).
The synchronisation function deactivates if
the settings for the front-passenger side are
changed. 162
Operating the climate control systemClimate control

THERMATIC automatic climate control
with auxiliary heating
X Activate/deactivate the synchronisation
function using Audio 20/COMAND Online;
see the separate operating instructions).
The synchronisation function deactivates if
the settings for the front-passenger side are
changed.
THERMOTRONIC automatic climate con-
trol
X Activate/deactivate the synchronisation
function using Audio 20/COMAND Online;
see the separate operating instructions).
The synchronisation function is deactivated:
R if the settings for the front-passenger side
are changed
R if the settings for the rear compartment are
changed Demisting the windscreen
General notes You can use this function to defrost the wind-
screen or to demist the inside of the wind-
screen and the front side windows.
Switch off the windscreen demisting function as soon as the windscreen is clear again.
Activating/deactivating the wind-
screen demisting function X
Turn the key to position 2in the ignition
lock (Y page 181).
X To activate: press the¬rocker switch
on the front control unit up or down.
The indicator lamp above the ¬rocker
switch lights up. The current climate con-
trol settings are deactivated.
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
i If necessary, the "Cooling with air dehu-
midification" function is activated. In this
case, the indicator lamp above the
¿ button remains switched off.
X To deactivate: press the¬rocker
switch up or down.
The indicator lamp above the ¬rocker
switch goes out. The previous settings are
reactivated. Air-recirculation mode
remains deactivated.
or
X Press the top or bottom section of the Ã
rocker switch. Demisting the windows
Windows misted up on the inside X
Activate the "Cooling with air dehumidifi-
cation" function with the ¿rocker
switch.
or
X Activate the cooling with air dehumidifica-
tion function via Audio 20/COMAND
Online; see the separate operating instruc-
tions.
For THERMOTRONIC automatic climate
control with auxiliary heating, the "Cooling
with air dehumidification" function can only be activated using Audio 20/COMAND
Online.
X Switch on automatic mode using the Ã
rocker switch.
X If the windows continue to mist up, activate
the windscreen demisting function using
the ¬ rocker switch.
i You should only select this setting until
the windscreen is clear again. Operating the climate control system
163Climate control

Windows misted up on the outside
X
Activate the windscreen wipers.
X Switch on automatic mode using the Ã
rocker switch.
i If you clean the windows regularly, they
do not mist up so quickly. 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 181).
X Press the ¤rocker switch up or down.
The indicator lamp above the ¤rocker
switch lights up or goes out. 164
Operating the climate control systemClimate control

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 also temporarily deactivate the flow
of fresh air manually if unpleasant odours are
entering the vehicle from outside. The air
already inside the vehicle will then be recir-
culated.
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.
Activating/deactivating X
Turn the key to position 2in the ignition
lock (Y page 181).
X To activate: press thegrocker switch
up or down.
The indicator lamp above the grocker
switch lights up.
Air-recirculation mode switches on automat-
ically:
R at high outside temperatures
R at high levels of pollution (THERMOTRONIC
automatic climate control only)
R in a tunnel (vehicles with a navigation sys-
tem only)
The indicator lamp above the grocker
switch is not lit when automatic air-recircula- tion mode is activated. Outside air is added
after about 30 minutes. X
To deactivate: press thegrocker
switch up or down.
The indicator lamp above the grocker
switch goes out.
Air-recirculation mode is deactivated auto-
matically:
R after approximately five minutes at outside
temperatures below approximately 5 †
R after approximately five minutes if cooling
with air dehumidification is deactivated
R after approximately 30 minutes at outside
temperatures above approximately 5 † if
the cooling with air dehumidification func-
tion 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
between the side window and window frame.
There is a risk of injury. Operating the climate control system
165Climate control
Z

Activating/deactivating
X
Turn the key to position 0in the ignition
lock or remove it (Y page 181).
X To activate: press the!rocker switch
up or down.
The indicator lamp above the !rocker
switch lights up.
The blower will run at a low speed regardless of the airflow setting.
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 the!rocker
switch up or down.
The indicator lamp above the !rocker
switch 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 Perfume atomiser
Operating the perfume atomiser G
WARNING
If children open the perfume vial, they could
drink the perfume or it could come into con-
tact with their eyes. There is a risk of injury. Do not leave children unsupervised in the vehicle.
If the perfume liquid has been drunk, consult
a doctor. If perfume comes into contact with
your eyes or skin, rinse the eyes with clean
water. If you continue to experience difficul-
ties, consult a doctor. H
Environmental note Full perfume vials must not
be disposed of with house-
hold rubbish. They must be
collected separately and dis-
posed of in an environmen- tally responsible recycling
system.
Dispose of full perfume vials
in an environmentally
responsible manner and
take them to a special waste
collection point. :
Perfume lid
; Perfume vial
The perfume atomiser helps to improve driv-
ing comfort.
Using Audio 20/COMAND Online, you can:
R switch the perfume atomiser on/off (see
separate Audio 20/COMAND Online oper-
ating instructions)
R regulate the perfume intensity (see the sep-
arate Audio 20/COMAND Online operating
instructions)
The following conditions can affect your per-
ception of the perfume intensity:
R operating mode of the automatic climate
control
R interior temperature
R time of year/day
R air humidity
R physiological condition of occupants, e.g.
fatigue or hunger
The perfume atomiser can only be operated
when the automatic climate control is
switched on and is only active when the glove compartment is closed.
The perfume atomiser is provided with a pre-
filled perfume vial. You can also choose from Operating the climate control system
167Climate control Z

X
To activate pre-entry climate control:
unlock the vehicle with the key or KEYLESS-
GO.
The air-conditioning functions are activatedfor up to 120 seconds for preheating and
for up to 60 seconds for pre-cooling.
The pre-entry climate control switches off
automatically when the engine is started.
Seat heating (heating), seat ventilation (ven-
tilation), perfume atomiser and ionisation
remain switched on after starting the engine. 170
Operating the climate control systemClimate control

Problems with the pre-entry climate control
Problem
Possible causes/consequences and
M
MSolutions The pre-entry climate
control cannot be
switched on or has
switched itself off. The charge status of the high-voltage battery is under the specified
minimum charge status.
X Start the engine when the vehicle is at a standstill.
The internal combustion engine drives the electric motor. The
electric motor is operating as an alternator. The high-voltage
battery is charging.
Further information on charging the high-voltage battery
(Y page 416). The pre-entry climate control was started more than twice when
the engine was switched off.
X Switch on the engine and let it run for more than ten seconds.
X Try again to switch the pre-entry climate control on. The difference between the interior temperature and the desired
temperature is too small.
X Increase the difference between the interior temperature and
the desired temperature. Remote activation of heating and ven-
tilation system
General notes Remote activation is only available on vehi-
cles with the BlueEFFICIENCY package.
The driver's and front-passenger seat areas
can also be heated or ventilated when the
engine is switched off.
The starter battery must be sufficiently
charged before remote activation can be
switched on.
When the vehicle is heated, the following
functions are activated:
R seat heating
R rear window heating
R exterior mirror heating
When the vehicle is ventilated, the following
functions are activated:
R blower
R seat ventilation If you have activated ionisation using Audio
20/COMAND Online (see separate operating
instructions), it is activated together with the
remote activation function.
Activating/deactivating the remote
activation function X
To switch on remote activation: push the
climate control symbol button on the key.
The air-conditioning functions are switched on, for up to 10 minutes for heating and up
to 120 minutes for ventilation.
Remote activation switches off automatically if:
R the ignition is switched on, or
R the engine is started
Seat heating (heating), seat ventilation (ven-
tilation) and ionisation remain switched on
after starting the engine. Operating the climate control system
171Climate control Z