2014 MERCEDES-BENZ C-CLASS SALOON cooling

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

THERMOTRONIC automatic climate con-
trol with auxiliary heating
You can activate or deactivate the cooling
with air dehumidification function using
Audio 20/COMAND Online; see the separate operating instructions. 158
Operating the climate control systemClimate control

Problems with the "Cooling with air dehumidification" function
Problem
Possible causes/consequences and
M
MSolutions THERMOTRONIC
with auxiliary heat-
ing:
cooling with air
dehumidification can
no longer be switched
on using Audio 20/
COMAND Online; see
the separate operating
instructions. The cooling with air dehumidification function has been deactiva-
ted due to a malfunction.
X Visit a qualified specialist workshop. THERMATIC/
THERMOTRONIC
without auxiliary
heating:
the indicator
lamp in the ¿but-
ton flashes three times
or remains off. The
cooling with air dehu-
midification function
can also no longer be
activated using Audio
20/COMAND Online
(see the separate oper-
ating instructions). The cooling with air dehumidification function has been deactiva-
ted 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. The "Cooling with air
dehumidification" function must be activated
manually in automatic mode. If necessary,
"Cooling with air dehumidification" can also
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. Operating the climate control system
159Climate 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

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

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

Hybrid system overview
:
Recuperative Brake System
; 12 V battery
= High-voltage battery
? Electric cables for the high-voltage electrical system
A High-voltage battery cooling
B Electric refrigerant compressor
C Power electronics cooling
D Electric vacuum pump
E Transmission with electric motor
F Power electronics (DC/AC converter or DC/DC converter)
You can deactivate the hybrid system manually. For further information on the high-voltage
disconnect device, see (Y page 43). Hybrid operation
271Driving and parking Z

Engine
Display messages
Possible causes/consequences and
M
MSolutions +
Top Top
up
upcoolant
coolant See
See
Owner’s Manual
Owner’s Manual The coolant level is too low.
! Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Top up the coolant, observing the warning notes before doing so
(Y page 393).
X If the coolant needs topping up more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop. ? ? The fan motor is faulty.
X If the coolant temperature is below 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid putting the engine under heavy load as you do so, e.g.
driving in mountainous terrain and stop-start traffic. ?
Coolant Stop vehi‐ Coolant Stop vehi‐
cle Switch engine cle Switch engine
off off The coolant is too hot.
A warning tone also sounds.
G WARNING
Never drive with an overheated engine. Driving when your engine is overheated can cause some fluids which may have leaked into
the engine compartment to catch fire.
In addition, steam from an overheated engine can cause serious
burns, which can occur just by opening the bonnet.
There is a risk of injury.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicle to prevent it from rolling away (Y page 207).
X Wait until the engine has cooled down.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X Do not start the engine again until the display message goes out
and the coolant temperature is below 120 †. The engine may
otherwise be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant level, the coolant temperature may rise to 120 †. Display messages
333On-board computer and displays Z