2012 MERCEDES-BENZ A CLASS Owners Manual

Fitting the wiper blades
X
Position new wiper blade : with
recess B on lug A.
X Fold wiper blade : in the direction of
arrow =
onto the wiper arm, until retaining
clips ; engage in bracket ?.
X Make sure that wiper blade : is seated
correctly.
X Fold the wiper arm back onto the wind-
screen.
Replacing the rear window wiper blade Removing the wiper blades
X
Remove the key from the ignition lock.
X Fold wiper arm :
away from the rear win-
dow until it engages.
X Position wiper blade ; at a right angle to
wiper arm :. X
Hold wiper arm : and press wiper
blade ; in the direction of the arrow until
it releases.
X Remove wiper blade ;.
Fitting the wiper blades
X Place new wiper blade ; onto wiper
arm :.
X Hold wiper arm : and press wiper
blade ; in the opposite direction to the
arrow until it engages.
X Make sure that wiper blade ; is seated
correctly.
X Position wiper blade ; parallel to wiper
arm :.
X Fold wiper arm : back onto the rear win-
dow. Windscreen wipers
119
Lights and windscreen wipers Z

Problems with the windscreen wipers
Problem Possible causes/consequences and
M SolutionsThe 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.
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 spray nozzles are
misaligned. The windscreen washer fluid from the spray nozzles no longer hits
the centre of the windscreen. The spray nozzles are misaligned.
X
Have the spray nozzles adjusted at a qualified specialist work-
shop.120
Windscreen wipersLights and windscreen wipers

Useful information ............................
122
Overview of climate control sys-
tems ................................................... 122
Operating the climate control sys-
tem ..................................................... 126
Adjusting the air vents .....................139 121Climate control

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 24). 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 defrost windscreen function
briefly, if required
THERMATIC automatic climate control/
THERMOTRONIC automatic climate control
regulates the temperature and the humidity
of the vehicle interior and filters out undesir-
able substances from the air.
THERMATIC automatic climate control/
THERMOTRONIC

automatic climate control is
only operational when the engine is running.
Optimum operation is only achieved with the
side windows and panorama sliding sunroof
closed.
The residual heat function can only be acti-
vated or deactivated with the ignition
switched off (Y page 133).
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the con-
venience opening feature (Y page 85). This will speed up the cooling process and the
desired

vehicle interior temperature will be
reached more quickly.
i The integrated filter can filter out most
particles of dust and completely filters out
pollen. 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 it
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 residual heat func-
tion may be activated automatically an hour
after the key has been removed in order to
dry the air-conditioning system. The vehicle
is ventilated for 30 minutes. 122
Overview of climate control systems
Climate control

Control panel for THERMATIC automatic climate control
:
To set the temperature (Y page 128)
; To demist the windscreen (Y page 130)
= To set the air distribution ( Y page 129)
? To activate/deactivate air-recirculation mode ( Y page 132)
A To set the airflow ( Y page 129)
B To activate/deactivate cooling with air dehumidification (Y page 126)
C To switch the rear window heating on/off ( Y page 131)Notes on using THERMATIC automatic
climate control
Automatic climate control The following contains notes and recommen-
dations
on optimum use of THERMATIC auto-
matic climate control.
R Switch on the air-conditioning system by
turning control knob A clockwise to the
desired position (except position 0).
R Set the temperature to 22 †.
R Recommendation to avoid misting of
the windows in the event of low outside
temperatures or rain: switch on the air
distribution ¯ and if possible switch off
P and O(Y page 129).
Deactivate air-recirculation mode
d(Y page 132). Set airflow control
A
to a setting between
3 and 6(Y page 129).
R Recommendation for rapid cooling or
heating of the vehicle interior: briefly set
airflow control A to a setting between 3
and 6(Y page 129).
R Recommendation for a constant vehi-
cle interior temperature: set airflow con-
trol A to a position between 1 and
3(Y page 129).
R Recommendation for air distribution in
winter: select the O and ¯ settings
(Y page 129).
Recommendation for air distribution in
summer: select the P or P and
¯ settings ( Y page 129).
R Only use the "Windscreen demisting" func-
tion briefly until the windscreen is clear
again. Overview of climate control systems
123
Climate control

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 If you change the settings of the climate
control system, the climate status display
appears for three seconds at the bottom of
the screen in the COMAND display. See
also the separate COMAND Online operat-
ing instructions 9
. You will see the current
settings of the various climate control func-
tions.
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 147).
9 Only for vehicles with "COMAND Online Multimedia System" optional equipment124
Overview of climate control systems
Climate control

Control panel for THERMOTRONIC automatic climate control (2-zone)
:
To set the temperature, left (Y page 128)
; To set climate control to automatic mode (Y page 128)
= To demist the windscreen (Y page 130)
? To increase the airflow ( Y page 129)
A To set the air distribution ( Y page 129)
B Display
C To activate/deactivate air-recirculation mode ( Y page 132)
D To switch climate control on/off (Y page 126)
E To set the temperature, right (Y page 128)
F To activate/deactivate the residual heat function ( Y page 133)
G To activate/deactivate cooling with air dehumidification (Y page 126)
H To reduce the airflow ( Y page 129)
I To switch the rear window heating on/off ( Y page 131)
J To switch the ZONE function on/off (Y page 129) Notes on using THERMOTRONIC auto-
matic 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 à and
¿ buttons. The indicator lamps in the
à and ¿ buttons light up.
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- Overview of climate control systems
125
Climate control

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 as well. The indi-
cator lamp in 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 resid-
ual heat function can only be activated or
deactivated with the ignition switched off.
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 147). Operating the climate control system
Switching climate control on/off
Points to observe before use When the climate control is switched off, the
air supply and air circulation are also
switched off. The windows could then mist
up.

Therefore, switch off climate control only
briefly.
THERMATIC automatic climate control X
Turn the key to position 2 in the ignition
lock (Y page 143).
X To switch on: turn
control A clockwise to
the desired position (except position 0)
(Y page 123).
X To switch off: turn control A anti-clock-
wise to position 0(Y page 123). THERMOTRONIC automatic climate
control X
Turn the key to position 2 in the ignition
lock (Y page 143).
X To activate: press the à button.
The
indicator lamp in the à button 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 deactivate: press the ^ button.
The
indicator lamp in the ^ button lights
up.
i THERMOTRONIC automatic climate con-
trol: switch on climate control primarily
using the à button. Activating/deactivating the cooling
with air dehumidification function
Points to observe before use If you deactivate the "Cooling with air dehu-
midification

function", the air inside the vehi-
cle will not be cooled in warmer weather. The
air inside the vehicle will not be dehumidified
either. The windows can mist up more
quickly. Therefore, only switch off the "Cool-
ing with air dehumidification function" briefly.
The "Cooling with air dehumidification" func-
tion is only available when the engine is run-
ning. 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. 126
Operating the climate control system
Climate control