2008 MERCEDES-BENZ CLK550 climate control

194 Controls in detail
Climate control
Setting the temperature
Use temperature controls2 and3
(
page 191) 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 climate control will adjust to the set
temperature as fast as possible.
Increasing
Turn temperature control2
and/or3 (
page 191) slightly clock-
wise.
The climate control system will corre-
spondingly adjust the interior air
temperature.Decreasing
Turn temperature control2
and/or3 (
page 191) slightly
counterclockwise.
The climate control system will corre-
spondingly adjust the interior air
temperature.
Adjusting air distribution
Use air distribution control4
(
page 191) to adjust the air distribution.
The following symbols are located on the
controls:
iIf you turn the temperature control fully
clockwise for one side of the vehicle, you are in-
creasing the temperature for the other side of
the vehicle as well.
iIf you turn the temperature control fully
counterclockwise for one side of the vehicle, you
are decreasing the temperature for the other
side of the vehicle as well.
SymbolFunction
aDirects air through the center,
side and rear passenger
compartment air vents
ZDirects air to the windshield
and the side defroster vents
bDirects air into the entire
vehicle interior
YDirects air to the footwells

195 Controls in detail
Climate control
Press buttonU (page 191).
The indicator lamp on the button goes
out. The automatic air distribution is
switched off. The air distribution is
controlled according to the selected
control setting.
Turn air distribution control 4
(
page 191) to the desired symbol.
Opening center and side air vents
Turn thumbwheels 2, 6and7
(
page 190) upward.
The side air vents1 and3 and cen-
ter air vents5 and 8 are open.
Closing center and side air vents
Turn thumbwheels 2, 6and7
(
page 190) downward.
The side air vents1 and3 and cen-
ter air vents5 and 8 are closed.
Adjusting air volume
Six blower speeds are available.
Press buttonU (page 191).
The indicator lamp on the button goes
out. The automatic air volume control
is switched off. The air volume is con-
trolled according to the currently
selected control setting.
Use the air volume control1
(
page 191) to adjust the air volume.
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 buttonPor0
(
page 191).
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 off
iKeep this setting selected only until the
windshield or the side windows are clear again.

196 Controls in detail
Climate control
Deactivating
Press buttonP or0
(
page 191) again.
The indicator lamp on the button goes
out. Defrosting is turned off.
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 climate con-
trol is switched off:
Turn air distribution control4
toaorY(
page 191).
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 191).
The indicator lamp on the button
comes on.Deactivating
Press button, (page 191).
The indicator lamp on the button goes
out.
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.
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 198) is activated, or
press buttonP or0.
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)

197 Controls in detail
Climate control
Air recirculation mode with conve-
nience closing or opening feature
Convenience closing
Press and hold button,
(
page 191) 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 191) 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).

198 Controls in detail
Climate control
Air conditioning
The cooling function, is only operational
when the engine is running, cools the vehi-
cle interior down to the selected tempera-
ture. The cooling function also
dehumidifies the air in the vehicle interior,
thus preventing the windows from fogging
up.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 button2(page 191).
The indicator lamp on the button goes
out.
The cooling function switches off after
a short delay.
Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condition-
ing.
Press button2(page 191) again.
The indicator lamp on the button
comes on.The air conditioning uses the
refrigerant R134a. This refrigerant is free
of CFCs which are harmful to the ozone
layer.
iCondensation may drip out from underneath
the vehicle. This is normal and not an indication
of a malfunction.
Warning!G
If you turn off the cooling function, 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.
!If the air conditioning cannot be turned on
again, this indicates that the air conditioning is
losing refrigerant. The compressor has turned
itself off.
Have the air conditioning checked at the nearest
authorized Mercedes-Benz Center.

199 Controls in detail
Climate control
Rear passenger compartment
adjustable air vents
The air conditioning for the rear passenger
compartment is controlled via the climate
control panel (
page 191).The air vents for the rear passenger
compartment are located in the rear
center console.
1Thumbwheel for air volume control for
center air vents
2Left center air vent
3Right center air ventAdjusting air distribution
Push the slide for the left center
vent2 or right center vent3 to the
left, right, up or down.
The air flow is directed in the corre-
sponding direction.
Adjusting air volume
Turn thumbwheel1 t o t h e l e f t o r r i g h t .
The air volume is increased or
decreased.
iThe temperature at the center air vents2
and3 for the rear passenger compartment
(
page 199) is the same as at the dashboard
center air vents.iFor draft-free ventilation, move the slider for
the center air vents2 and3 upward.

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