Page 185 of 506

184 Controls in detailClimate control (CLK 320)Increasing
Turn temperature control2 or3
(page 181) slightly to the right.
The climate control system will corre-
spondingly adjust the interior air tem-
perature.
Decreasing
Turn temperature control2 or3
(page 181) slightly to the left.
The climate control system will corre-
spondingly adjust the interior air tem-
perature.
Adjusting air distribution and volume
Use air distribution control4
(page 181) to adjust the air distribution.
The following symbols are found on the
controls:
Use the air volume control1
(page 181) to adjust the air volume. You
can select between six air volume speeds.Adjusting manually
Press buttonU (
page 181).
The indicator lamp on the button goes
out.
Select any of the six air volume speeds
and the air distribution.
Adjusting automatically
Press buttonU (
page 181).
The indicator lamp on the button
comes on. The temperature, air distri-
bution and volume are adjusted auto-
matically.
Symbol
Function
Z
Directs air to the windshield
and the side defroster vents
b
Directs air into the entire
vehicle interior
Y
Directs air to the footwells
a
Directs air through the center,
side and rear passenger
compartment air vents
Page 186 of 506
185 Controls in detail
Climate control (CLK 320)
Windshield fogged on the outside
Switch the windshield wipers on
(page 52).
Switch to manual mode.
Turn the air distribution control4
toa orY (
page 181).
Defrosting
Activating
Press buttonP or0
(page 181).
The indicator lamp on the button
comes on.
The air conditioning switches
automatically to the following functions:
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 181).
The indicator lamp on the button goes
out. Defrosting is turned off.
iThese settings should only be selected
for a short time.
Page 187 of 506

186 Controls in detailClimate control (CLK 320)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 button, (
page 181).
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.
Window fogging may impair visibility and
endanger you and others.
iIf you keep button, pressed the
side windows will close.Warning!
G
Never operate the side windows if there is
the possibility of anyone being harmed by
the closing procedure.
In the event that the closing 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.
iThe air recirculation mode is activated
automatically at high outside tempera-
tures.
The indicator lamp on the, button
is not lit when the air recirculation
mode is automatically switched on.
After approx. 30 minutes, outside air is
added to the air inside the vehicle.
If you have turned off the air condi-
tioning (
page 187) or the outside
temperature is below 41°F (5°C), the
air recirculation mode will not switch
on automatically.
Page 188 of 506

187 Controls in detail
Climate control (CLK 320)
Deactivating
Press button, (
page 181).
The indicator lamp on the button goes
out.
The air recirculation mode is deactivated
automatically:
after five minutes if the outside
temperature is below
approximately 41°F (5°C)
after five minutes if the air conditioning
is turned off
after 30 minutes if the outside
temperature 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.
Air conditioning
The air conditioning is operational while
the engine is running and cools the interior
air to the temperature set by the operator.
iIf you keep button, pressed the
side windows will return to their
previous position.
iCondensation may drip out from under-
neath 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.
Page 189 of 506

188 Controls in detailClimate control (CLK 320)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.
Climate control panel design A
Press button±(
page 181).
The indicator lamp on the button
comes on.
The cooling function switches off after
a short delay.
Climate control panel design B
Press button2(
page 181).
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.
Climate control panel design A
Press button±(
page 181) again.
The indicator lamp on the button goes
out.
Climate control panel design B
Press button2(
page 181) 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.
!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.
Page 190 of 506
189 Controls in detail
Climate control (CLK 320)
Rear passenger compartment adjustable air vents
The air conditioning for the rear passenger
compartment is controlled via the climate
control panel (
page 181).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 vents
for the rear passenger
compartment2 and3 is the same as
at the dashboard center air vents.
iFor draft-free ventilation, push
slides2 and3 upward.
Page 191 of 506
190 Controls in detailAutomatic climate control (CLK 500/CLK 55 AMG)
Page 192 of 506

191 Controls in detail
Automatic climate control (CLK 500/CLK 55 AMG)
Depending on production date, your vehi-
cle is equipped with either automatic
climate control panel design A or B.Automatic climate control panel design A
Automatic climate control panel design B
Item
1
Left side air vent, adjustable
2
Thumbwheel for air volume control
for center air vents
3
Right side air vent, adjustable
4
Automatic climate control panel
5
Right center air vent, adjustable
6
Thumbwheel for air volume control
for right side center air vent
7
Thumbwheel for air volume control
for left side center air vent
8
Left center air vent, adjustableiFor draft-free ventilation, move the slid-
ers for the center air vents1, 3, 5,
8 to the middle position.
Item
1
Left side air distribution control
2
Defrosting
3
Temperature control, left, raising
4
Display
5
Air volume control, raising
6
Temperature control, right, raising
7
Rear window defroster
8
Right side air distribution control
9
Charcoal filter
a
AC cooling on/off (AC
OFF
or A/C)
Residual heat/ventilation
b
Temperature control, right, lowering
c
Air volume control, lowering
d
Temperature control, left, lowering
e
Air recirculation
f
Automatic climate control on/off
(complete system)
g
Air distribution and air volume
(automatic mode)