2014 MERCEDES-BENZ C-CLASS SALOON engine

Problems with the windscreen wipers
Problem
Possible causes/consequences and
M
MSolutions The windscreen wipers
are jammed. Leaves or snow, for example, may be obstructing the windscreen
wiper movement. The wiper motor has been deactivated.
X For safety reasons, you should remove the key from the ignition
lock.
or
X Switch off the engine using the Start/Stop button and open the
driver's door.
X Remove the cause of the obstruction.
X Switch the windscreen wipers back on. The windscreen wipers
fail completely. The windscreen wiper drive is malfunctioning.
X Select another wiper speed on the combination switch.
X Have the windscreen wipers checked at a qualified specialist
workshop. The windscreen washer
fluid from the spray
nozzles no longer hits
the centre of the wind-
screen. The spray nozzles are misaligned.
X Have the spray nozzles adjusted at a qualified specialist work-
shop. 148
Windscreen wipersLights and windscreen wipers

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variations are pos- sible. Note that your vehicle may not be
equipped with all of the functions descri-
bed. This is also the case for systems and
functions relevant to safety.
i Read the information on qualified special-
ist workshops: (Y page 27). Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could other-
wise mist up.
To prevent the windows from misting up:
R switch off climate control only briefly
R switch on air-recirculation mode only
briefly
R switch on the cooling with air dehumidifi-
cation function
R switch on the "demist windscreen" function
briefly, if required
Climate control regulates the temperature
and air humidity in the vehicle interior. The
interior filter cleans the air, thus improving
the interior climate.
For vehicles without hybrid drive, the "Cooling with air dehumidification" function is availa-
ble when the engine is running. For hybrid
vehicles, the cooling with air dehumidification function is also available via the electric
refrigerant compressor when the engine is
not running. Optimum climate control is only
achieved with the side windows and roof
closed.
The residual heat function can only be acti-
vated or deactivated with the ignition
switched off (Y page 166). i
Ventilate the vehicle for a brief period
during warm weather, e.g. using the con-
venience opening feature (Y page 107).
This will speed up the cooling process and
the desired interior temperature will be
reached more quickly.
i The integrated filter filters out most par-
ticles of dust and soot and completely fil-
ters out pollen. It also reduces gaseous pol-
lutants and odours. 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 this 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 acti-
vated automatically 60 minutes after the
key has been removed depending on vari-
ous factors, e.g. the outside temperature.
The vehicle is then ventilated for
30 minutes to dry the automatic climate
control. 150
Overview of climate control systemsClimate control

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. Overview of climate control systems
153Climate control

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

X
To switch off: press thet/!
rocker switch up or down.
The Audio 20/COMAND Online climate
control menu opens.
X Deactivate the climate control using the
air-conditioning function bar; see the sep-
arate Audio 20/COMAND Online operating
instructions.
or
X Set the airflow to level 0 using the H
rocker switch. 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,
deactivate the "Cooling with air-dehumidifi-
cation" function only briefly.
For vehicles without hybrid drive, the "Cooling with air dehumidification" function is availa-
ble when the engine is running. For hybrid
vehicles, the cooling with air dehumidification function is also available via the electric
refrigerant compressor when the engine is
not running. The air inside the vehicle is
cooled and dehumidified according to the
temperature selected.
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 THERMATIC automatic climate control
X To activate: press the¿rocker switch
up or down.
The indicator lamp above the rocker switch lights up.
or
X Activate the cooling with air dehumidifica-
tion function via Audio 20/COMAND
Online (see the separate operating instruc-
tions).
X To deactivate: press the¿rocker
switch up or down.
The indicator lamp above the rocker switch
goes out.
or
X Deactivate the cooling with air dehumidifi-
cation function via Audio 20/COMAND
Online (see the separate operating instruc-
tions).
THERMOTRONIC automatic climate con-
trol without auxiliary heating
X To activate: press the¿rocker switch
up or down.
The indicator lamp above the rocker switch lights up.
or
X Activate the cooling with air dehumidifica-
tion function via Audio 20/COMAND
Online (see the separate operating instruc-
tions).
X To deactivate: press the¿rocker
switch up or down.
The indicator lamp above the rocker switch
goes out.
or X Deactivate the cooling with air dehumidifi-
cation function via Audio 20/COMAND
Online (see the separate operating instruc-
tions). Operating the climate control system
157Climate control

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 (vehicles
with a sliding sunroof/panorama slid-
ing sunroof): press and hold the g
rocker switch up or down until the side win- dows and the sliding sunroof/panorama
sliding sunroof start to close automatically.The indicator lamp above the grocker
switch lights up. Air-recirculation mode is
activated.
X Convenience closing feature (vehicles
without a sliding sunroof/panorama
sliding sunroof): press and hold the g
rocker switch up or down until the side win- dows start to close automatically.
The indicator lamp above the grocker
switch lights up. Air-recirculation mode is
activated.
If you open the side windows or the sliding sunroof/panorama sliding sunroof man-
ually after closing them with the conveni-
ence closing feature, they will remain in this
position when opened using the conveni-
ence opening feature.
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 window, press the
W button again.
X Only vehicles with sliding sunroof/
panorama sliding sunroof: press the3
switch to open/close the sliding sun-
roof/panorama sliding sunroof.
The sliding sunroof/panorama sliding sun-
roof stops.
X To then open the sliding sunroof/pano-
rama sliding sunroof, pull back on the 3
button.
Notes on the automatic reversing feature for:
R the side windows (Y page 106)
R the sliding sunroof/panorama sliding sun-
roof (Y page 111)
X Convenience opening feature (vehicles
with a sliding sunroof/panorama slid-
ing sunroof): press and hold the g
rocker switch up or down until the side win- dows and the sliding sunroof/panorama
sliding sunroof start to open automatically.
The indicator lamp above the grocker
switch goes out. Air-recirculation mode is
deactivated.
X Convenience opening feature (vehicles
without a sliding sunroof/panorama
sliding sunroof): press and hold the g
rocker switch up or down until the side win- dows start to open automatically.
The indicator lamp above the grocker
switch goes out. Air-recirculation mode is
deactivated. Activating/deactivating the residual
heat function
General notes The residual heat function is only available
with THERMOTRONIC automatic climate con- trol and THERMATIC automatic climate con-
trol with auxiliary heating.
Once the engine is switched off, it is possible
to make use of the residual heat of the engine to continue heating or ventilating the front
compartment of the vehicle for approximately
30 minutes. The heating or ventilation time
depends on the set interior temperature. 166
Operating the climate control systemClimate control

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