2015 MERCEDES-BENZ B-CLASS HATCHBACK climate control

Function Page
:
Overhead control panel 33
;
PARKTRONIC warning dis-
play
155
=
Combination switch 99
?
Instrument cluster 27
A
Horn
B
DIRECT SELECT lever 129
C
Steering wheel gearshift pad-
dles 132 Function Page
D
Light switch 97
E
Diagnostics connection 22
F
Opens the bonnet 239
G
Electric parking brake 146
H
Ignition lock 126
I
Adjusts the steering wheel 92
J
Cruise control lever 151
K
Climate control systems 11426
CockpitAt a glance

Useful information
i This Owner's Manual describes all models,
series and optional equipment for your vehi-
cle that were available at the time of going to
press. National variations are possible. Note
that your vehicle may not be equipped with all
of the functions described. This is also the
case for systems and functions relevant to
safety.
i Read the information on qualified specialist
workshops: (Y page 23). Overview of climate control systems
General notes
Observe the settings recommended on the fol-
lowing pages. The windows could otherwise
mist up.
To prevent the windows from misting up:
R switch off climate control only briefly
R activate air-recirculation mode only briefly
R activate the "Cooling with air dehumidifica-
tion" function
R activate the windscreen demisting function
briefly, if required
THERMOTRONIC automatic climate control reg-
ulates the temperature and the humidity in the
vehicle interior and filters undesirable substan-
ces out of the air.
THERMOTRONIC automatic climate control is
only operational when the vehicle is ready to
drive. Optimum operation is only achieved with
the side windows closed.
The residual heat function can only be activated or deactivated with the ignition switched off
(Y page 122).
Always keep the ventilation flaps behind the
side panelling clear (Y page 106). Otherwise the
vehicle will not be ventilated correctly.
i Ventilate the vehicle for a brief period during
warm weather, e.g. using the convenience
opening feature (Y page 83). This will speed
up the cooling process and the desired inte-
rior temperature will be reached more
quickly.
i The integrated filter filters out most parti-
cles of dust and soot and completely filters
out pollen. It also reduces gaseous pollutants 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 Vehicles with auxiliary heating:
under
certain environmental conditions, the resid-
ual heat function may be activated automati-
cally an hour after the key has been removed
in order to dry the automatic climate control.
When the automatic climate control drying
function is active, the blue LED lamp is lit in
the rocker switch in the centre console. The
vehicle is then ventilated for 30 minutes.
Vehicles without auxiliary heating: under
certain environmental conditions, the resid-
ual heat function may be activated automati-
cally an hour after the key has been removed in order to dry the automatic climate control.
The vehicle is then ventilated for 30 minutes. 114
Overview of climate control systemsClimate control

Control panel for THERMOTRONIC automatic climate control (2-zone)
:
To set the temperature, left (Y page 117)
; To set climate control to automatic mode (Y page 117)
= To demist the windscreen (Y page 118)
? To increase the airflow (Y page 118)
A To set the air distribution (Y page 117)
B Display
C To activate/deactivate air-recirculation mode (Y page 120)
D To switch climate control on/off (Y page 116)
E To set the temperature, right (Y page 117)
F To activate/deactivate the residual heat function (Y page 122)
G To activate/deactivate cooling with air dehumidification (Y page 116)
H To reduce the airflow (Y page 118)
I To switch the rear window heating on/off (Y page 119)
J To switch the ZONE function on/off (Y page 118)Information on using THERMOTRONIC
automatic climate control
Automatic climate control The following contains instructions and recom-
mendations to enable you to get the most out of
your THERMOTRONIC automatic climate con-
trol.
R Activate climate control using the Ãand
¿ buttons. The indicator lamps in the
à and¿ buttons light up.
R Set the temperature to 22 †.
R Only use the "Windscreen demisting" function
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 otherwise mist up as no fresh air is drawn into the vehicle inair-recirculation mode.
R Use the ZONE function to adopt the temper-
ature settings on the driver's side for the
front-passenger side as well. The indicator
lamp in the ábutton goes out.
R Use the residual heat function if you want to
briefly 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 If you change the settings of the climate con-
trol system, the climate status display Overview of climate control systems
115Climate control

appears for approximately three seconds at
the bottom of the screen in the Audio/
COMAND display (see separate operating
instructions). You will see the current settings
of the various climate control functions.
You can choose between various drive programs
with the program selector button (Y page 131).
If you have selected drive program E+:
R the cooling output is reduced when cooling
R the heat output is reduced during heating
R the rear window heating time is reduced
If you have selected drive program Eor S, the
current climate settings are maintained. Operating the climate control system
Switching the 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.
THERMOTRONIC automatic climate
control X
Turn the key to position 2in the ignition lock
(Y page 126).
X To activate: press theÃbutton.
The indicator lamp in the Ãbutton lights
up. Airflow and air distribution are set to auto-
matic mode.
or X Press the ^button.
The indicator lamp in the ^button goes
out. The previous settings are reactivated.
X To deactivate: press the^button.
The indicator lamp in the ^button lights
up.
i Activate climate control primarily using the
à button. Activating/deactivating cooling with
air dehumidification
General notes If you deactivate the "Cooling with air dehumid-
ification" function, the air inside the vehicle will
not be cooled. The air inside the vehicle will also
not be dehumidified. The windows can mist up
more quickly. Therefore, only deactivate the
"Cooling with air dehumidification" function
briefly.
The "Cooling with air dehumidification" function
is operational when the vehicle is ready to drive. The air inside the vehicle is cooled and dehu-
midified 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 malfunc-
tion.
Activating/deactivating X
To activate: press the¿button.
The indicator lamp in the ¿button lights
up.
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. 116
Operating the climate control systemClimate control

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 cooling with air
dehumidification func-
tion cannot be activated. The cooling with air dehumidification function 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 main-
tained automatically at a constant level. The
system automatically regulates the temperature of the dispensed air, the airflow and the air dis- tribution.
The automatic mode functions optimally when
the "Cooling with air dehumidification" function is activated. If desired, cooling with air dehu-
midification can be deactivated.
If you deactivate the "Cooling with air-dehumid-
ification" function, the air inside the vehicle will
not be cooled. The air inside the vehicle will also
not be dehumidified. The windows can mist up
more quickly. Therefore, only deactivate the
"Cooling with air-dehumidification" function
briefly.
Setting climate control to automatic
mode X
Turn the key to position 2in the ignition lock
(Y page 126).
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.
X To switch to manual mode: press theÉ
or Ë button.
or X Press the KorI button.
The indicator lamp in the Ãbutton goes
out. Automatic air distribution and airflow are deactivated. Setting the temperature
Different temperatures can be set for the driv-
er's and front-passenger sides. The set temper-
ature is automatically maintained at a constant
level.
X Turn the key to position 2in the ignition lock
(Y page 126).
X To increase/reduce: turn control:orE
anti-clockwise or clockwise. Only change the
temperature setting in small increments.
Start at 22 †. Setting the air distribution
Air distribution settings ¯
Directs the airflow through the demister
vents
P Directs the airflow through the centre
and side air vents
O Directs the airflow through the footwell
air vents
S Directs the airflow through 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 demister
vents
a Directs the airflow through the footwell
and demister vents
_ Directs the airflow through the demister
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 if the adjusters are turned clockwise until they
engage. Operating the climate control system
117Climate control

Setting the air distribution
X
Turn the key to position 2in the ignition lock
(Y page 126).
X Press the ÉorË button repeatedly
until the desired symbol appears in the dis-
play. Setting the airflow
X Turn the key to position 2in the ignition lock
(Y page 126).
X To increase/reduce: press theKor
I button. Switching the ZONE function on/off
X To activate: press theábutton.
The indicator lamp in the ábutton lights
up.
The temperature setting for the driver's side
is not adopted for the front-passenger side.
X To deactivate: press theábutton.
The indicator lamp in the ábutton goes
out.
The temperature setting for the driver's side
is adopted for the front-passenger side. Demisting the windscreen
General notes You can use this function to defrost the wind-
screen or to demist the inside of the windscreen
and the side windows.
i You should only select the "Windscreen
demisting" function until the windscreen is
clear again.
Switching the "Windscreen demisting"
function on/off X
Turn the key to position 2in the ignition lock
(Y page 126).
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
Vehicles with windscreen heating: the
windscreen heating is switched on automati-
cally using the "Windscreen demisting" func-
tion.
i The "Windscreen demisting" function auto-
matically sets the blower output to the opti-
mum demisting effect. As a result, the airflow may increase or decrease automatically after
the ¬ button is pressed.
i You can adjust the blower output manually
while the "Windscreen demisting" function is
in operation:
Press the óorô button.
X To deactivate: press the¬button.
The indicator lamp in the ¬button goes
out. The previous settings are reactivated.
Air-recirculation mode remains deactivated.
or
X Press the Ãbutton.
The indicator lamp in the ¬button goes
out. Airflow and air distribution are set to
automatic mode.
or X Turn temperature control :orE anti-clock-
wise or clockwise (Y page 115). Demisting the windows
Windows misted up on the inside X
Activate the ¿"Cooling with air dehumid-
ification" function.
X Activate automatic mode Ã.
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. 118
Operating the climate control systemClimate control

Windows misted up on the outside
X
Activate the windscreen wipers.
X Set the air distribution to PorO.
i You should only select this setting until the
windscreen is clear again. 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 window
heating may switch off.
Switching on/off X
Turn the key to position 2in the ignition lock
(Y page 126).
X Press the ¤button.
The indicator lamp in the ¤button lights
up or goes out. Operating the climate control system
119Climate control

Problems with the rear window heating
Problem
Possible causes/consequences and
M
MSolutions The rear window heating
has switched off prema-
turely or cannot be acti-
vated. 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 heating
can be activated again. Switching air-recirculation mode
on/off
General notes You can deactivate the flow of fresh air if
unpleasant odours are entering the vehicle from
outside. The air already inside the vehicle will
then be recirculated.
If you activate air-recirculation mode, the win-
dows can mist up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows misting up.
Switching on/off X
Turn the key to position 2in the ignition lock
(Y page 126).
X To activate: press theebutton.
The indicator lamp in the ebutton lights
up.
Air-recirculation mode is activated automati-
cally:
R at high outside temperatures
R at high levels of pollution
When air-recirculation mode is activated auto-
matically, the indicator lamp in the ebutton
is not lit. Outside air is added after about
30 minutes.
X To deactivate: press theebutton.
The indicator lamp in the ebutton goes
out. i
Air-recirculation mode is deactivated auto-
matically:
R after approximately five minutes at outside
temperatures below approximately 7 †
R after approximately five minutes if the
"Cooling with air dehumidification" func-
tion is deactivated
R after approximately 30 minutes at outside
temperatures above approximately 7 † if
the cooling with air dehumidification func-
tion is activated Convenience opening or closing using
the air-recirculation button G
WARNING
When using convenience closing, you could
become trapped within the sweep of the clos- ing window. There is a risk of injury.
Monitor the entire closing procedure when
using convenience closing. When closing,
make sure that no one has any parts of the
body within 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.
When opening, make sure that nobody is
touching the side window. If someone
becomes trapped, immediately press
the W switch in the door to stop the move-
ment of the side windows. To continue closing
the side window, pull on the Wswitch. 120
Operating the climate control systemClimate control