Page 148 of 462

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Read the information on qualified
specialist workshops: (Y page 28).Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could
otherwise fog up.
To prevent the windows from fogging up:
R switch off climate control only briefly
R switch on air-recirculation mode only
briefly
R switch on the cooling with air
dehumidification function
R switch on the defrost windshield function
briefly, if required
Climate control regulates the temperature
and the humidity in the vehicle interior and
filters undesirable substances out of the air.
Climate control can only be operated when
the engine is running. Optimum operation is
only achieved with the side windows and roof
closed.
The residual heat function can only be
activated or deactivated with the ignition
switched off (Y page 161).
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature (Y page 95).
This will speed up the cooling process and
the desired interior temperature will be
reached more quickly. i
The integrated filter filters out most
particles of dust and soot and completely
filters out pollen. It also reduces gaseous
pollutants and odors. 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
Maintenance Booklet. As it depends on
environmental conditions, e.g. heavy air
pollution, the interval may be shorter than
stated in the Maintenance Booklet.
i It is possible that the residual heat
function may be activated automatically an
hour after the SmartKey has been removed
in order to dry the automatic climate
control. The vehicle is then ventilated for
30 minutes. 146
Overview of climate control systemsClimate control
Page 149 of 462
Control panel for dual-zone automatic climate control
USA only
Front control panel
: To set the temperature, left (Y page 157)
; To defrost the windshield (Y page 159)
= To switch maximum cooling on/off (Y page 159)
? To switch cooling with air dehumidification on/off (Y page 155)
A To switch the rear window defroster on/off (Y page 160)
B To set the temperature, right (Y page 157)
C To activate/deactivate air-recirculation mode (Y page 161)
D To set the air distribution (Y page 158)
E To increase the airflow (Y page 158)
F To reduce the airflow (Y page 158)
G To switch climate control on/off (Y page 154)
H To set climate control to automatic (Y page 156) Overview of climate control systems
147Climate control
Page 150 of 462
Canada only
Front control panel
: To set the temperature, left (Y page 157)
; To defrost the windshield (Y page 159)
= To switch the ZONE function on/off (Y page 159)
? To activate/deactivate cooling with air dehumidification (Y page 155) or activate/
deactivate the residual heating function ( Ypage 161)
A To switch the rear window defroster on/off (Y page 160)
B To set the temperature, right (Y page 157)
C To activate/deactivate air-recirculation mode (Y page 161)
D To set the air distribution (Y page 158)
E To increase the airflow (Y page 158)
F To reduce the airflow (Y page 158)
G To switch climate control on/off (Y page 154)
H To set climate control to automatic (Y page 156)Rear control panel
: To set rear-compartment climate control to automatic
; To switch rear-compartment climate control on/off 148
Overview of climate control systemsClimate control
Page 151 of 462

=
To direct the airflow through the rear air vents
? To direct the airflow through the footwell vents Information about using 2-zone
automatic climate control
The following contains notes and
recommendations on optimum use of dual-
zone automatic climate control.
R Activate climate control using the Ãand
¿/Á buttons. The indicator lamps in
the à and¿/Á buttons light up.
R Set the temperature to 72 ‡ (22 †).
R Only use the "Windshield defrosting"
function briefly until the windshield is clear
again.
R Only use air-recirculation mode briefly, e.g.
if there are unpleasant outside odors or
when in a tunnel. The windows could
otherwise fog up, since no fresh air is drawn
into the vehicle in air-recirculation mode.
R Use the ZONE function to adopt the
temperature settings on the driver's side
for the front-passenger side as well. The
indicator lamp above the ábutton goes
out.
R Vehicles with COMAND: if you change the
settings of the climate control system, the
climate status display appears for
approximately three seconds at the bottom
of the screen in the COMAND display. See
also the separate COMAND operating
instructions. You will see the current
settings of the various climate control
functions. Overview of climate control systems
149Climate control
Page 152 of 462

Control panel for 3-zone automatic climate control
USA only
Front control panel
: To set the temperature, left (Y page 157)
; To defrost the windshield (Y page 159)
= To switch maximum cooling on/off (Y page 159)
? To switch cooling with air dehumidification on/off (Y page 155)
A To switch the rear window defroster on/off (Y page 160)
B To set the temperature, right (Y page 157)
C To switch the ZONE function on/off (Y page 159)
D To switch climate control on/off (Y page 154)
E To set the air distribution (Y page 158)
F To increase the airflow (Y page 158)
G To reduce the airflow (Y page 158)
H Display
I To adjust the climate mode settings (Y page 157)
J To activate/deactivate air-recirculation mode (Y page 161)
K To set climate control to automatic (Y page 156)
Rear control panel
L To increase the airflow (Y page 158)
M Setting the temperature (Y page 157)
N To set rear-compartment climate control to automatic (Y page 156)
O To direct the airflow through the rear air vents (Y page 158)
P To direct the airflow through the footwell vents (Y page 158)150
Overview of climate control systemsClimate control
Page 153 of 462

Q
To switch rear-compartment climate control on/off (Y page 154)
R To reduce the airflow (Y page 158)Canada only
Front control panel
: To set the temperature, left (Y page 157)
; To defrost the windshield (Y page 159)
= To switch the residual heat function on/off (Y page 161)
? To switch cooling with air dehumidification on/off (Y page 155)
A To switch the rear window defroster on/off (Y page 160)
B To set the temperature, right (Y page 157)
C To switch the ZONE function on/off (Y page 159)
D To switch climate control on/off (Y page 154)
E To set the air distribution (Y page 158)
F To increase the airflow (Y page 158)
G To reduce the airflow (Y page 158)
H Display
I To adjust the climate mode settings (Y page 157)
J To activate/deactivate air-recirculation mode (Y page 161)
K To set climate control to automatic (Y page 156)
Rear control panel
L To increase the airflow (Y page 158)
M To set the temperature (Y page 157)
N To set rear-compartment climate control to automatic (Y page 156)
O To direct the airflow through the rear air vents (Y page 158)
P To direct the airflow through the footwell vents (Y page 158) Overview of climate control systems
151Climate control
Page 154 of 462

Q
To switch rear-compartment climate control on/off (Y page 154)
R To reduce the airflow (Y page 158)Control panel for 3-zone automatic climate control with additional rear-
compartment climate control USA only
Front control panel
: To set the temperature, left (Y page 157)
; To defrost the windshield (Y page 159)
= To switch maximum cooling on/off (Y page 159)
? To activate/deactivate cooling with air dehumidification (Y page 155) or activate/
deactivate the residual heating function (Y page 161)
A To switch the rear window defroster on/off (Y page 160)
B To set the temperature, right (Y page 157)
C To switch the ZONE function on/off (Y page 159)
D To switch rear-compartment climate control on/off (Y page 154)
E To set the air distribution (Y page 158)
F To increase the airflow (Y page 158)
G To reduce the airflow (Y page 158) or switch off climate control
H Display
I To adjust the climate mode settings (Y page 157)
J To activate/deactivate air-recirculation mode (Y page 161)
K To set climate control to automatic (Y page 156)
Rear control panel
L To increase the airflow (Y page 158)152
Overview of climate control systemsClimate control
Page 155 of 462

M
To set the temperature (Y page 157)
N To set rear-compartment climate control to automatic (Y page 156)
O To direct the airflow through the rear air vents (Y page 158)
P To direct the airflow through the footwell vents (Y page 158)
Q To switch rear-compartment climate control on/off (Y page 154)
R To reduce the airflow (Y page 158)Canada only
Front control panel
: To set the temperature, left (Y page 157)
; To defrost the windshield (Y page 159)
= To switch the ZONE function on/off (Y page 159)
? To activate/deactivate cooling with air dehumidification (Y page 155) or activate/
deactivate the residual heating function (Y page 161)
A To switch the rear window defroster on/off (Y page 160)
B To set the temperature, right (Y page 157)
C To switch rear-compartment climate control on/off
D To switch climate control on/off (Y page 154)
E To set the air distribution (Y page 158)
F To increase the airflow (Y page 158)
G To reduce the airflow (Y page 158)
H Display
I To adjust the climate mode settings (Y page 157)
J To activate/deactivate air-recirculation mode (Y page 161)
K To set climate control to automatic (Y page 156)
Rear control panel Overview of climate control systems
153Climate control