MERCEDES-BENZ CLK350 2008 C209 Owner's Manual

200 Controls in detail
Automatic climate control
Except CLK 350 Canada

201 Controls in detail
Automatic climate control
USA only
Canada only
Item
1Left side air vent, adjustable
2Thumbwheel for air volume control
for center air vents
3Right side air vent, adjustable
4Automatic climate control panel
5Right center air vent, adjustable
6Thumbwheel for air volume control
for right side center air vent
7Thumbwheel for air volume control
for left side center air vent
8Left center air vent, adjustable
iFor draft-free ventilation, move the sliders
for the center air vents and side air vents to the
middle position.
Item
1Left side air distribution control
2Front defroster
3Temperature control, left, raising
4Display
5Air volume control, raising
6Temperature control, right, raising
7Rear window defroster
8Right side air distribution control
9Charcoal filter
aAC cooling on/off
Residual heat/ventilation
(Canada only)
bTemperature control, right, lowering
cAir volume control, lowering
dTemperature control, left, lowering
eAir recirculation
fAutomatic climate control on/off
(complete system)
gAir distribution and air volume
(automatic mode)
Item

202 Controls in detail
Automatic climate control
The automatic climate control is operation-
al whenever the engine is running. You can
operate the automatic climate control sys-
tem in either the automatic or manual
mode. The system cools or heats the inte-
rior depending on the selected interior
temperature and the current outside
temperature.Nearly all dust particles, pollutants and
odors are filtered out before outside air
enters the passenger compartment
through the air distribution system.
The air conditioning will not engage (no
cooling) if theA/C mode is deactivated
(
page 210).
Warning!G
When operating the automatic climate
control, the air that enters the passenger
compartment through the air vents can be
very hot or very cold (depending on the set
temperature). This may cause burns or frost-
bite on unprotected skin in the immediate
area of the air vents. Always keep sufficient
distance between unprotected parts of the
body and the air vents. If necessary, use the
air distribution controls (
page 201) to
direct the air to air vents in the vehicle inte-
rior that are not in the immediate area of un-
protected skin.
Warning!G
Severe conditions (e.g. strong air pollution)
may require replacement of the filter before
its scheduled 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.
Warning!G
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.
iKeep the air intake grille in front of the wind-
shield free of snow and debris.
Do not obstruct air flow by placing objects on the
air flow-through exhaust slots below the rear
window.
iIf the vehicle interior is hot, ventilate the in-
terior before driving off, see “Summer opening
feature” (
page 253). The automatic climate
control will then adjust the interior temperature
to the set value much faster.

203 Controls in detail
Automatic climate control
Deactivating the automatic climate
control system
Deactivating
Press button´ (page 201).
The indicator lamp on the button
comes on.
Reactivating
Make sure the ignition is switched on.
Press button´ (page 201).
The indicator lamp on the button goes
out. The previous settings are once
again in effect.Operating the automatic climate con-
trol system in automatic mode
Activating
Press buttonU (page 201) while
the engine is running.
The indicator lamp on the button
comes on. The air volume and air distri-
bution are adjusted automatically.1Temperature, left
2Blower speed
3Temperature, right
Use temperature controls3
anddor6 and b (
page 201) to
separately adjust the air temperature
on each side of the passenger compart-
ment.
The temperature of the vehicle interior
is adjusted automatically.
Deactivating
Press buttonU (page 201) again.
The indicator lamp on the button goes
out. The automatic operation of air vol-
ume and air distribution switches off.
Warning!G
When the automatic climate control is
switched off, the outside air supply and cir-
culation 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.
iWhen operating the climate control system
in automatic mode, you will only rarely need to
adjust the temperature, air volume and air
distribution.
In automatic mode, the dehumidify function is
switched on when the system is cooling. If nec-
essary, this function can be switched off by
pushing the button2or9 (
page 201).
iYou can switch the automatic climate con-
trol system on and off for each side of the
passenger compartment as desired.

204 Controls in detail
Automatic climate control
Setting the temperature
Use temperature controls3 andd for
the left side or6 andb for the right side
(
page 201) to separately adjust the air
temperature on each side of the passenger
compartment. You should raise or lower
the temperature setting in small incre-
ments, preferably starting at 72°F (22°C).
The automatic climate control will adjust
to the set temperature as fast as possible.Increasing
Press and hold temperature button3
and/or6 (
page 201) until the de-
sired temperature appears in the
display4 (
page 201).
The automatic climate control system
will correspondingly adjust the interior
air temperature.Decreasing
Press and hold temperature buttonb
and/ord (
page 201) until the de-
sired temperature appears in the
display4 (
page 201).
The automatic climate control system
will correspondingly adjust the interior
air temperature.
iIf you increase the temperature for one side
of the vehicle to the highest adjustable value
then you will see the message
HI in the display.
This also increases the temperature for the other
side of the vehicle.
iIf you decrease the temperature for one side
of the vehicle to the lowest adjustable value then
you will see the message
LO in the display. This
also decreases the temperature for the other
side of the vehicle.

205 Controls in detail
Automatic climate control
Adjusting air distribution
Use the air distribution controls1 and8
(
page 201) to separately adjust the air
distribution on each side of the passenger
compartment. The following symbols are
located on the controls:
Turn air distribution control1 or8
(
page 201) to the desired symbol.
The indicator lamp on the buttonU
goes out.
The automatic air distribution is
switched off. The air distribution is
controlled according to the selected
control setting.Opening center and side air ventsTurn thumbwheels 2, 6 and 7
(
page 200) upward.
The center air vents 5 and 8 and side
air vents 1 and 3 (
page 200) are
open.
Closing center and side air vents
Turn thumbwheels 2, 6 and 7
(
page 200) downward.
The center air vents 5 and 8 and side
air vents 1 and 3 (
page 200) are
closed.
SymbolFunction
ZDirects air to the windshield
and the side defroster vents
bDirects air into the entire
vehicle interior
YDirects air to the footwells
aDirects air through the center,
side and rear passenger
compartment air vents
iYou can also turn the air distribution control
to a position between two symbols.

206 Controls in detail
Automatic climate control
Adjusting air volume
Use buttonU (
page 201) for auto-
matic mode or air volume controls

orQ (
page 201) to adjust air volume
manually.
Seven blower speeds are available.
Press button
to decrease
orQ (
page 201) to increase air
volume to the desired level.
The indicator lamp on the buttonU
goes out.
The automatic air distribution remains
switched on.
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.
Activating
Press buttonP or0
(
page 201).
The indicator lamp on the button
comes on.
The air conditioning switches
automatically to the following functions:

cooling on to dehumidify

maximum blowing and heating
power

air flows onto the windshield and
the front side windows

the air recirculation mode is
switched offDeactivating
Press buttonP or0
(
page 201) again.
The indicator lamp on the button goes
out.
The previous settings are once again in
effect.
Windshield fogged on the outside
Switch the windshield wipers on
(
page 56).
If the automatic mode of the automatic cli-
mate control is switched off:
Turn air distribution control1 or8
toa orY (
page 201).
iKeep this setting selected only until the
windshield or the side windows are clear again.
iIf you have switched on the defrost function
using thePor0 button, you cannot
make any other settings.
iThe cooling remains switched on.
iKeep this setting selected only until the
windshield is clear again.

207 Controls in detail
Automatic climate control
Maximum cooling MAXCOOL
If the left and right air distribution controls
as well as the airflow volume control are
set toU (
page 201) and there is a
high need for cooling, the display
“MAXCOOL” appears.
This provides the fastest possible cooling
of the vehicle interior (when side windows
and tilt/sliding sunroof* or soft top are
closed).
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.
Activating
Press button, (page 201).
The indicator lamp on the button
comes on.Deactivating
Press button, (page 201).
The indicator lamp on the button goes
out.Warning!G
Fogged windows impair visibility, endanger-
ing 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 (
page 210) is activated, or
press buttonP or 0.
iThe air recirculation mode is activated auto-
matically at high outside temperatures.
The indicator lamp on button, is not lit when
the air recirculation mode is automatically
switched on.
A quantity of outside air is added after approxi-
mately 30 minutes.
iThe air recirculation mode is deactivated au-
tomatically:

after 5 minutes if the outside temperature is
below approximately 41°F (5 °C)

after 5 minutes if the air conditioning is
turned off

after 30 minutes if the outside temperature
is above approximately 41°F (5 °C)

208 Controls in detail
Automatic climate control
Air recirculation mode with conve-
nience closing or opening feature
Convenience closing
Press and hold button,
(
page 201) until the windows and the
tilt/sliding sunroof* (CLK coupe) are
closed or have reached the desired po-
sition. The indicator lamp on the button
comes on. The air recirculation mode is
activated.Convenience opening
Press and hold button,
(
page 201) until the windows and the
tilt/sliding sunroof* (CLK coupe) have
return to their previous position or they
have reached the desired position. The
indicator lamp on the button goes out.
The air recirculation mode is
deactivated.
Warning!G
Never operate the side windows and the
tilt/sliding sunroof* (CLK coupe) if there is
the possibility of anyone being harmed by
the closing procedure.
When using the air recirculation mode with
convenience closing feature, should the up-
ward movement of a window be blocked by
some obstructions including but not limited
to arms, hands, fingers. etc., the automatic
reversal feature will not operate.
In the event that the procedure causes
potential danger, the closing of the side
windows can be immediately halted by
releasing the, button or by pressing or
pulling the respective window switch.
CLK coupe:
The closing of the tilt/sliding sunroof* can
be immediately halted by releasing the,
button or by moving the tilt/sliding sunroof*
switch in the overhead control panel in any
direction.
iA side window or the tilt/sliding sunroof*
(CLK coupe) will only return to its previous posi-
tion if it has not been moved to another position
using the respective side window switch or
tilt/sliding sunroof* (CLK coupe) switch after it
was closed with button,. A side window or
tilt/sliding sunroof* (CLK coupe) that was
moved will remain in its current position if
button, is used to re-open the remaining
side windows or tilt/sliding sunroof* (CLK
coupe).

209 Controls in detail
Automatic climate control
Charcoal filter
An activated charcoal filter markedly
reduces bad odors and removes pollutants
from air entering the passenger compart-
ment. The charcoal filter can be activated
or deactivated.
The system switches automatically to the
air recirculation mode, if the

charcoal filter is switched on

carbon monoxide (CO) or nitrogen
oxide (NO
X) concentration of the out-
side air increases beyond a predeter-
mined level
Activating
Press buttone (page 201).
The indicator lamp on the button
comes on.Deactivating
Press buttone (page 201).
The indicator lamp on the button goes
out.
iThe automatic air recirculation mode does
not function if theA/C (indicator lamp on
button2 or 9 not lit) mode is deactivat-
ed, or if the outside temperature has fallen
below 41°F (5°C).
iIf you press and hold buttone, the side
windows and tilt/sliding sunroof* will close.
iThe activated charcoal filter should be
switched off when windows fog up on the inside,
or if the passenger compartment needs to be
quickly heated or cooled down.
Warning!G
Never operate the side windows and the
tilt/sliding sunroof* (CLK coupe) if there is
the possibility of anyone being harmed by
the closing procedure.
When using the air recirculation mode with
convenience closing feature, should the up-
ward movement of a window be blocked by
some obstructions including but not limited
to arms, hands, fingers. etc., the automatic
reversal feature will not operate.
In the event that the procedure causes po-
tential danger, the closing of the side win-
dows can be immediately halted by
releasing thee button or by pressing or
pulling the respective window switch.
CLK coupe:
The closing of the tilt/sliding sunroof* can
be immediately halted by releasing thee
button or by moving the tilt/sliding sunroof*
switch in the overhead control panel in any
direction.
iIf you press and hold buttone, the side
windows and the tilt/sliding sunroof* (CLK
coupe) will return to their previous position.
A side window or tilt/sliding sunroof* (CLK
coupe) will only return to its previous position if
it has not been moved to another position using
the respective side window switch or tilt/sliding
sunroof* (CLK coupe) switch after it was closed
with buttone. A side window or tilt/sliding
sunroof* (CLK coupe) that was moved will re-
main in its current position if buttone is
used to re-open the remaining side windows or
tilt/sliding sunroof* (CLK coupe).