Page 179 of 442

179 Controls in detail
Climate control
Adjusting center air vents:
The thumbwheels for left2 and right6 
center air vents are automatically posi-
tioned for optimum interior airflow. In this 
position, center air vent4 and adjustable 
left and right center vents3 and5 are 
fully opened.
Heating:
Only in manual mode is it possible to lower 
the temperature in the headroom by regu-
lating the cold-airflow using 
thumbwheel7 (
page 174).Windshield fogged on the outside
Switch the windshield wipers on 
(page 48).
Press the Ubutton.
The indicator lamp on the button 
comes on.
Adjusting air volume
Adjusting manually
Five blower speeds are available.
Press to decrease orQ to in-
crease air volume to the desired level.
The 
Auto
 display disappears and the 
automatic mode is switched off. The 
selected blower speed is shown in the 
display.Adjusting automatically
Press the U button.
The air volume is adjusted automatical-
ly.
Defrosting
Activating
Press buttonP. 
The indicator lamp on the button 
comes on.
or
Switch off air recirculation, if selected. 
Press buttonO. 
The indicator lamp on the button goes 
out.iThese settings should only be selected 
for a short time.
 
         
        
        
     
        
        Page 180 of 442
180 Controls in detailClimate control
Close center air vents.
Open left and right side air vents and 
adjust side air vents upwards.
Deactivating
Press buttonP.
The indicator lamp on the button goes 
out. Defrosting is turned off.
Air recirculation mode
Switch to air recirculation mode to prevent 
unpleasant odors from entering the vehicle 
from the outside. This setting cuts off the 
intake of outside air and recirculates the 
air in the passenger compartment.Activating
Press buttonO.
The indicator lamp on the button 
comes on.
Warning!
G
When the outside temperature is below 
41°F (5°C), only switch to air recirculation 
mode for short periods to prevent window 
fogging.
iThe air recirculation mode is activated 
automatically at high outside tempera-
tures.
If you have turned off the air condition-
ing (
page 182) or the outside 
temperature is below 41°F (5°C), the 
air recirculation mode will not switch 
on automatically.
 
         
        
        
     
        
        Page 181 of 442

181 Controls in detail
Climate control
Deactivating
Press buttonO.
The indicator lamp on the button goes 
out.
The air recirculation mode is deactivated 
automatically:
after five minutes if the outside temper-
ature is below approximately 41°F 
(5°C)
after five minutes if the air conditioning 
is turned off
after 30 minutes if the outside temper-
ature is above approximately 41°F 
(5°C)At outside temperatures above 79°F 
(26°C), the system will not automatically 
switch back to outside air. A quantity of 
outside air is added after approximately 
30 minutes.
Deactivating the climate control sys-
tem
Deactivating
Press button M (
page 176). 
Reactivating
Press button M again(
page 176). 
or
Press any button on the climate control 
panel (
page 176). 
Warning!
G
Never operate the windows and 
sliding / pop-up roof* or panorama 
sliding / pop-up roof* if there is the possibil-
ity of anyone being harmed by the opening 
or closing procedure.
In case the procedure causes potential dan-
ger:
Vehicles with sliding/pop-up roof: The pro-
cedure for the windows can be immediately 
halted by pressing or pulling the respective 
window switch. The procedure for the slid-
ing/pop-up roof can be immediately halted 
by moving the switch for the sliding/pop-up 
roof in any direction.
The closing of the side windows and the slid-
ing/pop-up roof can be reversed by again 
pressing and holding theO button.
Vehicles with panorama sliding/pop-up 
roof: The procedure for the windows and 
panorama sliding/pop-up roof can be imme-
diately halted by releasing theO button.
iIf you keep buttonO pressed, the 
side windows and sliding / pop-up 
roof* or panorama sliding / pop-up 
roof* will return to their previous posi-
tion. 
         
        
        
     
        
        Page 182 of 442

182 Controls in detailClimate controlAir conditioning
The air conditioning is operational while 
the engine is running and cools the interior 
air to the temperature set by the operator.
Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the climate 
control system. The air in the vehicle will 
then no longer be cooled or dehumidified.
Press button± (
page 176). 
The indicator lamp on the button± 
comes on.Activating
Moist air can fog up the windows. You can 
dehumidify the air with the air condition-
ing.
Press± again (
page 176). 
The indicator lamp on the button± 
goes out.
The air conditioning uses the refrigerant 
R134a. This refrigerant is free of CFCs 
which are harmful to the ozone layer.
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.
Activating
Turn the SmartKey in the starter switch 
to position0or1, or remove it from 
the starter switch.
Press buttonT (
page 176).
The indicator lamp on buttonT 
comes on.
iCondensation may drip out from under-
neath the vehicle. This is normal and 
not an indication of a malfunction.
!If the air conditioning cannot be turned 
on again, this indicates that the air con-
ditioning is losing refrigerant. The com-
pressor has turned itself off.
Have the air conditioning checked at 
the nearest authorized Mercedes-Benz 
Center. 
         
        
        
     
        
        Page 183 of 442
183 Controls in detail
Climate control
Deactivating
Press buttonT (
page 176).
The indicator lamp on buttonT 
goes out.
The residual heat is automatically turned 
off:
when the ignition is switched on
after about 30 minutes
if the battery voltage drops
iHow long the system will provide heat-
ing depends on the coolant tempera-
ture and the temperature set by the 
operator. The blower will run at speed 
setting 1 regardless of the air distribu-
tion control setting. 
         
        
        
     
        
        Page 184 of 442
184 Controls in detailAutomatic climate control*
Automatic climate control* 
         
        
        
     
        
        Page 185 of 442
185 Controls in detail
Automatic climate control*
Item
1
Automatic climate control panel
2
Thumbwheel for air volume control 
for left center air vent
3
Left center air vent, adjustable
4
Air vent, fixed 
5
Right center air vent, adjustable
6
Thumbwheel for air volume control 
for right center air vent
7
Thumbwheel for air volume control 
for adding cold air
8
Thumbwheel for air volume control 
for side air vent
9
Side defroster vent, fixed
a
Side air vent, adjustable
Item
1
Thumbwheel for air volume control 
for side air vent
2
Side air vent, adjustable
Item
1
Left rear center air vent, adjustable
2
Right rear center air vent, adjust-
able
3
Air volume control for right rear 
center air vent
4
Temperature rocker switch, right
5
Display
6
Temperature rocker switch, left
7
Air volume control for left rear cen-
ter air vent 
         
        
        
     
        
        Page 186 of 442
186 Controls in detailAutomatic climate control*
Item
1
Air distribution, left
2
Defrosting
3
Temperature rocker switch, left
4
Display
5
Temperature rocker switch, right
6
Rear window defroster
Item
7
Air distribution, right
8
Air distribution and air volume, right 
(automatic, manual)
9
Activated charcoal filter
a
Rear air-conditioning remote con-
trol
b
Increase air volume
Item
c
Automatic climate control on / off
d
Decrease air volume
e
AC cooling on / off (AC
OFF
)
Residual heat / ventilation (REST)
f
Air recirculation 
g
Air distribution and air volume, left 
(automatic, manual)