MERCEDES-BENZ R350 2010 W251 Owner's Manual

X
Press button I to decrease or button
K to increase air volume to the desired
level.
The air volume decreases/increases to the
next lower/higher blower speed and
heating switches to the temperature that
was set before the front defroster was
switched on.
The indicator lamp in button ¦ goes out.
The indicator lamp in button Á comes
on.
or
X Turn temperature control : and/or C
(Y page 164) slightly in any direction.
Heating switches to the temperature that
was set before the front defroster was
switched on.
The

indicator lamp in button ¦ goes out.
The indicator lamp in button Á comes
on.
i The air conditioning compressor remains
on even if the indicator lamp in button
¦ goes out. This helps to prevent the
windshield from fogging.
Deactivating X
Press button ¦ again.
The indicator lamp in the button goes out.
Defrosting is turned off.
The previous settings are once again in
effect. The air conditioning compressor
remains switched on.
i To deactivate, you can also press button
^ or Ã.
Windshield fogged on the outside X
Switch the windshield wipers on
(Y page 104).
X Press air distribution button P
or O. Air recirculation mode
Switch to air recirculation mode to prevent
unpleasant odors from entering the vehicle
from the outside (e. g. before driving through
a tunnel). This setting cuts off the intake of
outside air and recirculates the air in the
passenger compartment. G
Warning!
Fogged windows impair visibility,
endangering you and others. If the windows
begin to fog on the inside, switching off the
air recirculation mode immediately should
clear interior window fogging. If interior
window fogging persists, make sure the air
conditioning is activated, or press button
¦.
X Activating: Press button d.
The
indicator lamp in the button comes on.
i The air recirculation mode is activated
automatically at high outside
temperatures.
The

indicator lamp in button d is not lit
when the air recirculation mode is switched
on automatically.
A quantity of outside air is added after
approximately 30 minutes.
If you have turned off the air conditioning
or the outside temperature is below 41‡
(5†), the air recirculation mode will not
switch on automatically.
X Deactivating: Press button d.
The indicator lamp in the button goes out. Climate control
169
Controls in detail
251_AKB; 4; 52, en-US
d2ureepe, Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 169 Z

i
The manually selected air recirculation
mode is deactivated automatically:
R after 5 minutes if the outside
temperature is below approximately
41‡ (5†)
R after 5 minutes if the air conditioning and
air-drying are turned off
R after 30 minutes if the outside
temperature is above approximately
41‡ (5†) Residual heat and ventilation
With the engine switched off, it is possible to
continue to heat or ventilate the interior for
up to 30 minutes. This feature makes use of
the residual heat produced by the engine.
i How long the system will provide heating
depends on the coolant temperature and
the battery voltage. Regardless of the temperature and air
volume set on the climate control panel, an
interior temperature is aimed at by 72‡
(22†) and the blower runs on low speed to
protect the vehicle battery.
X Activating: Switch off the ignition.
X Press button Á.
The indicator lamp in the button comes on.
X Deactivating: Press button Á again.
The indicator lamp in the button goes out.
The residual heat is deactivated automatically
R when the ignition is switched on
R after approximately 30 minutes
R if the battery voltage drops
R if the coolant temperature is too low 3-zone automatic climate control
Control panels
USA only170
3-zone automatic climate controlControls in detail
251_AKB; 4; 52, en-US
d2ureepe,
Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 170

Function Recommendation/Notes
:
Temperature control, driver’s
side i
Set the temperature to 72 ‡
(22†). (Y page 176)
;
Air distribution and air volume
(automatic mode) i
Switches on the automatic
mode. The indicator lamp in
button à comes on. (Y page 176)
=
Front defroster i
Keep this setting selected
only

until the windshield or the
side windows are clear again. (Y page 178)
?
Increasing air volume (Y page 178)
A
Air distribution (directs air
through the windshield and side
air vents) (Y page 177)
B
AC cooling on/off i
Switches on the air
conditioning. The indicator
lamp in button Á comes
on. (Y page 175)
Residual heat/ventilation i
With
the engine turned off, it
is possible to continue to heat
or ventilate the interior. (Y page 180)
C
Temperature control, passenger
side i
Set the temperature to 72
‡
(22†). (Y page 176)
D
Operating the rear climate
control from the front (Y page 175)
E
Air distribution (directs air
through center and side air
vents) (Y page 177)
F
Air distribution (directs air
through the footwells and side
air vents) (Y page 177)
G
Air volume display
H
Decreasing air volume (Y page 178)
I
Rear window defroster (Y page 180)
J
Air recirculation i
Only use this function for a
short time, e.g. in a tunnel.
Otherwise, the windows can
fog

up due to lack of fresh air. (Y page 179)3-zone automatic climate control
171
Controls in detail
251_AKB; 4; 52, en-US
d2ureepe, Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 171 Z

Function Recommendation/Notes
K
Interior temperature sensor
L
Climate control on/off i
Switches on the climate
control system. The indicator
lamp in button ^ goes out. (Y page 175)
Canada only
Function Recommendation/Notes
:
Temperature control, driver’s
side i
Set the temperature to 72‡
(22†). (Y page 176)
;
Air distribution and air volume
(automatic mode) i
Switches on the automatic
mode. The indicator lamp in
button à comes on. (Y page 176)
=
Air distribution, driver’s side
(directs air through the
windshield and side air vents) (Y page 177)
?
Front defroster i
Keep this setting selected
only until the windshield or the
side windows are clear again. (Y page 178)
A
Increasing air volume (Y page 178)
B
Rear window defroster (Y page 180)172
3-zone automatic climate controlControls in detail
251_AKB; 4; 52, en-US
d2ureepe,
Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 172

Function Recommendation/Notes
C
Air distribution, passenger side
(directs air through the
windshield and side air vents) (Y page 177)
D
Operating the rear climate
control from the front (Y page 175)
E
Temperature control, passenger
side i
Set the temperature to 72 ‡
(22†). (Y page 176)
F
Automatic climate control on/
off i
Switches on the climate
control system. The indicator
lamp

in button ^ goes out. (Y page 175)
G
Air distribution, passenger side
(directs

air through the footwells
and side air vents) (Y page 177)
H
Air distribution, passenger side
(directs air through center and
side air vents) (Y page 177)
I
AC cooling on/off i
Switches on the air
conditioning. The indicator
lamp in button Á comes
on. (Y page 175)
Residual heat ventilation i
With
the engine turned off, it
is possible to continue to heat
or ventilate the interior. (Y page 180)
J
Display
K
Decreasing air volume (Y page 178)
L
Air recirculation i
Only use this function for a
short time, e.g. in a tunnel.
Otherwise, the windows can
fog

up due to lack of fresh air. (Y page 179)
M
Air distribution, driver’s side
(directs air through center and
side air vents) (Y page 177)
N
Air distribution, driver’s side
(directs

air through the footwells
and side air vents) (Y page 177)3-zone automatic climate control
173
Controls in detail
251_AKB; 4; 52, en-US
d2ureepe, Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 173 Z

Function Recommendation/Notes
O
Interior temperature sensor
P
Adopting driver’s side settings
for all zones (Y page 180)
Rear automatic climate control
:
Increasing air volume
; Temperature control
= Air distribution and air volume (automatic
mode)
? Air distribution (directs air through the
side air vents)
A Air distribution (directs air through the
footwells and side air vents)
B Rear automatic climate control on/off
C Decreasing air volume Notes on 3-zone automatic climate
control
With the help of a sun sensor, the automatic
climate control determines the relation of the
sun to the vehicle and automatically adjusts
the inside temperature for every individual
zone.
The automatic climate control is operational
whenever the engine is running. It cools the
vehicle’s interior according to the angle and
intensity of the sun’s rays, the outside
temperature and the selected temperature.
You can operate the automatic climate
control in either the automatic or manual
mode. Nearly all dust particles, pollutants and odors
are filtered out before outside air enters the
passenger compartment through the air
distribution system. G
Warning!
Severe conditions (e.g. strong air pollution)
may require replacement of the filter before
its scheduled replacement interval. A clogged
filter will reduce the air volume to the interior
and the windows could fog up, impairing
visibility and endangering you and others.
Have a clogged filter replaced as soon as
possible at an authorized Mercedes-Benz
Center.
The air conditioning will not engage (no
cooling) if the A/C mode is deactivated
(Y page 175). G
Warning!
Follow the recommended settings for heating
and cooling given on the following pages.
Otherwise the windows could fog up,
impairing visibility and endangering you and
others.
Keep the air intake grille in front of the
windshield free of snow and debris.
i If the vehicle interior is hot, ventilate the
interior before driving off, see “Summer
opening feature” (Y page 108). The climate
control will then adjust the interior
temperature to the set value much faster. 174
3-zone automatic climate controlControls in detail
251_AKB; 4; 52, en-US
d2ureepe,
Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 174

Deactivating the climate control
system
G
Warning!
When the climate control system is switched
off, the outside air supply and circulation are
also
switched off. Only choose this setting for
a short time. Otherwise the windows could fog
up, impairing visibility and endangering you
and others.
Deactivating the front climate control X
Deactivating: Press button ^.
The
indicator lamp in the button comes on.
Canada only: Display J (Y page 172) is
cleared.
X Reactivating: Press button Ã.
i You can also press button ^ on the
climate control panel.
If you press button ¦ to reactivate the
climate control system, the defrosting
mode is activated.
Deactivating the rear climate control
from the front USA only
X
Deactivating: Press button ±.
The
indicator lamp in the button comes on.
X Reactivating: Press button ±.
The indicator lamp in the button goes out.
Canada only
X Deactivating: Press button X.
The
indicator lamp in the button comes on.
In display J (Y page 172), you will see the
Y symbol followed by MODE for
approximately 3 seconds.
X Within these 3 seconds press button
^.
In

display J, you will see the Y symbol
followed by OFF.
The rear climate control is switched off.
X Reactivating: Press button X. The indicator lamp in the button comes on.
In

display J, you will see the Y symbol
followed by ON and MODE. The MODE display
is cleared and the indicator lamp in button
X goes out after approximately
3 seconds.
The rear climate control switches on.
Deactivating the rear climate control
from the rear X
Deactivating: Press button ^.
The
indicator lamp in the button comes on.
X Reactivating: Press button Ã.
The
indicator lamp in the button comes on. Air conditioning
The air conditioning is operational while the
engine

is running and cools the interior air to
the temperature set by the operator. In
addition, the air conditioning dehumidifies
the interior air and helps prevent window
fogging. G
Warning!
If you switch off the air conditioning, the
vehicle will not be cooled when weather
conditions

are warm. The windows can fog up
more quickly. Window fogging may impair
visibility and endanger you and others.
i Condensation may drip out from
underneath the vehicle. This is normal and
not an indication of a malfunction.
Deactivating It is possible to deactivate the cooling
function of the climate control system. The
interior air will then no longer be cooled or
dehumidified.
X
Press button Á.
The indicator lamp in the button goes out.
The cooling function switches off after a
short delay. 3-zone automatic climate control
175
Controls in detail
251_AKB; 4; 52, en-US
d2ureepe, Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 175 Z

Activating
Moist air can fog up the windows. You can
dehumidify the interior air with the air
conditioning.
X
Press button Á again.
The indicator lamp in the button comes on.
The air conditioning uses the refrigerant
R134a.
This refrigerant is free of CFCs which
are harmful to the ozone layer.
! If the air conditioning cannot be activated
again, this indicates that the air
conditioning is losing refrigerant. The
compressor has turned off.
Have the air conditioning checked at the
nearest authorized Mercedes-Benz Center. Automatic mode
You
can switch the climate control system on
and off for each zone of the passenger
compartment as desired.
When operating the climate control system in
automatic mode, the interior air temperature,
air volume and air distribution are adjusted
automatically.
In automatic mode, cooling with
dehumidification is switched on. This function
can be switched off if necessary. G
Warning!
If you switch off the air conditioning, the
vehicle will not be cooled when weather
conditions

are warm. The windows can fog up
more quickly. Window fogging may impair
visibility and endanger you and others.
X Set the desired temperature
(Y page 176).
X Activating: Press button Ã.
The
indicator lamp in the button comes on. i
The settings for the passenger side are
also used for the rear passenger
compartment.
X Deactivating:
Press button I or K.
The indicator lamp in button à goes out.
The automatic air volume is switched off
and is controlled according to the desired
setting. The automatic air distribution
remains switched on.
or
X Press an air distribution button Z 11
,
M 11
, \ 11
, P, ¯ 12
, c 11
or
O.
The

indicator lamp in button à goes out.
The automatic air distribution is switched
off and is controlled according to the
desired position. The automatic air volume
remains switched on.
Automatic mode with rear climate
control panel X
Activating: Press button Ã.
The
indicator lamp in the button comes on.
The temperature, air volume and air
distribution are adjusted automatically.
X Deactivating:
Press button I or K.
The automatic air volume is switched off
and is controlled according to the desired
setting. The automatic air distribution
remains switched on.
or
X Press button M or P.
The automatic air distribution is switched
off and is controlled according to the
desired

position. The automatic air volume
remains switched on. Setting the temperature
You can set the air temperature for each of
the 3 zones separately.You should raise or
lower the temperature setting in small
11 Canada only
12 USA only 176
3-zone automatic climate control
Controls in detail
251_AKB; 4; 52, en-US
d2ureepe,
Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 176

increments, preferably starting at 72‡
(22†).
Front temperature with front climate
control panel
USA only
X
Increasing/decreasing: Turn
temperature control : and/or C
(Y page 170) slightly clockwise or
counterclockwise.
Canada only
X Increasing/decreasing: Turn
temperature control : and/or E
(Y page 172) slightly clockwise or
counterclockwise.
Rear temperature with front climate
control panel USA only
X
Press button ±.
X Increasing/decreasing: Turn
temperature control C (Y page 170)
slightly clockwise or counterclockwise.
Canada only
X Press button X.
In display J (Y page 172) you will see the
Y symbol.
X Increasing/decreasing: Turn
temperature control E (Y page 172)
slightly clockwise or counterclockwise. Rear temperature with rear climate
control panel X
Increasing/decreasing: Turn
temperature control ; (Y page 174)
slightly clockwise or counterclockwise. Adjusting air distribution
USA only The air distribution can be adjusted manually.
The symbols on the buttons represent the
following functions:
Symbol Function
¯
Directs air to the windshield and
side air vents
P
Directs air through the center
and side air vents
O
Directs air to the footwells and
side air vents
X
Press the desired air distribution button
¯, P, or O.
The automatic mode is switched off. The
indicator lamp in the desired button comes
on.
Canada only The air distribution can be adjusted
separately on each side of the passenger
compartment.
The symbols on the buttons represent the
following functions:3-zone automatic climate control
177Controls in detail
251_AKB; 4; 52, en-US
d2ureepe, Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 177 Z

Symbol
Driver’s
side Symbol
Passenger
side Function
Z M
Directs air to
the windshield
and side air
vents
\ P
Directs air
through the
center, side
and rear
passenger
compartment
air vents
c O
Directs air to
the footwells
and side air
vents
X
Press the desired air distribution button
Z, \, or c for the driver’s side,
or M, P, or O for the passenger
side.
The automatic mode is switched off. The
indicator
lamp in the desired button comes
on. Adjusting air volume
USA only
X Decrease/increase:
Press button I or
K.
The automatic mode is switched off. The
selected blower speed is shown in air
volume display G (Y page 170).
Canada only
X Decrease/increase:
Press button I or
K.
The automatic mode is switched off. The
selected blower speed appears in display
J (Y page 172). When using the Voice Control System, the
blower speed reduces automatically. When
the Voice Control System is not used
anymore, the blower speed increases to the
previously selected level. Front defroster
You can use this setting to defrost the
windshield, for example if it is iced up.
You can also defog the windshield and the
side windows.
i Keep this setting selected only until the
windshield or the side windows are clear
again.
Activating X
Press button ¦.
The
indicator lamp in the button comes on.
The climate control switches to the
following functions automatically:
R most efficient blower speed and heating
power, depending on outside
temperature
R air flows onto the windshield and the
front door windows (side air vents must
be open)
R the air conditioning compressor
switches on at outside temperatures
above approximately 41‡ (5†) for air-
drying
Adjustments
You can adjust the air volume and the
temperature when the front defroster is
switched on. The air flow will remain on the
windshield and front door windows.
X Press button I to decrease or button
K
to increase air volume to the desired
level.
The air volume decreases/increases to the
next lower/higher blower speed and
heating switches to the temperature that 178
3-zone automatic climate control
Controls in detail
251_AKB; 4; 52, en-US
d2ureepe,
Version: 2.11.8.1 2009-03-23T09:22:52+01:00 - Seite 178