climate control MERCEDES-BENZ CLK550 2008 C209 Owner's Guide

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).

210 Controls in detail
Automatic climate control
Air conditioning
The cooling function, 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 automatic
climate control system. The air in the
vehicle will then no longer be cooled or
dehumidified.
Press button2or9
(
page 201).
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
conditioning.
Press button2or9
(
page 201) 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.

211 Controls in detail
Automatic climate control
Residual heat and ventilation*
(Canada only)
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.ActivatingSwitch off the ignition (page 40).
Press button9 (page 201).
The indicator lamp on the button
comes on.Deactivating
Press button9 (page 201).
The indicator lamp on the button 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 heating
depends on

the coolant temperature

the temperature set by the operator
The blower will run at speed setting 1 regardless
of the air distribution control setting.

212 Controls in detail
Automatic climate control
Rear passenger compartment
adjustable air vents
The air conditioning for the rear passenger
compartment is controlled via the auto-
matic climate control panel (
page 201).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 he l e f t o r r i g h t .
The air volume is increased or de-
creased.
iThe temperature at the center air vents2
and3 for the rear passenger compartment
(
page 212) is the same as at the dashboard
center air vents.iFor draft-free ventilation, move the slider for
the center air vents2 and3 upward.

250 Controls in detail
Power windows
Opening and closing the windows
The side windows are opened and closed
electrically. The switches for all the side
windows are on the driver’s door. The
switches for the respective windows are
on the front passenger door and the rear
side trim panels.
1Left front window
2Right front window
3Right rear window
4Left rear window
5Rear window override switch
(
page 88)
Warning!G
When closing the windows, make sure there
is no danger of anyone being harmed by the
closing procedure.
The closing of the door windows can be im-
mediately halted by releasing the switch or,
if switch was pulled past the resistance
point and released, by either pressing or
pulling the respective switch.
The closing of the rear side windows can be
immediately halted by releasing the switch.
The door windows are equipped with the ex-
press-close and automatic reversal func-
tion. If a door window encounters an
obstruction that blocks its path in a circum-
stance where you pulled the switch past the
resistance point and released it to close the
window, the automatic reversal function will
stop the window and open it slightly.
If a door window encounters an obstruction
that blocks its path in a circumstance where
you are closing the window by pulling and
holding the switch, by pressing and holding
button ‹on the SmartKey, by pressing
and holding the lock button (vehicles with
KEYLESS-GO*) on an outside door handle,
CLK cabriolet: by operating the soft top
switch, or by pressing and holding
button, ore on the climate control
panel, the automatic reversal function will
not operate.
When leaving the vehicle, always remove the
SmartKey or SmartKey with KEYLESS-GO*
from the starter switch, take it with you, and
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an
unlocked vehicle. A child’s unsupervised ac-
cess to a vehicle could result in an accident
and/or serious personal injury.

251 Controls in detail
Power windows
Switch on the ignition (page 40).
Opening the windows
Press switch1 to4 to the resistance
point.
The corresponding window will move
downwards until you release the
switch.
Closing the windows
Pull switch1 to4 to the resistance
point.
The corresponding window will move
upwards until you release the switch.Fully opening the door windows
(Express-open)
Press switch1 or2 past the
resistance point and release.
The corresponding window opens
completely.
iYou can also open or close the windows us-
ing the:

SmartKey (summer opening/convenience
feature) (
page 253)

CLK cabriolet: Soft top switch (page 255).
Depending on current position, the windows may
also open or close when:

the air recirculation button, in the con-
trol panel of the climate control
(
page 191) or automatic climate control
(
page 201) is pressed and held
or

the charcoal filter buttone in the control
panel of the automatic climate control
(
page 201) is pressed and held
iOperating the rear side windows from the
rear is not possible if you activate the override
switch (
page 88).
iAfter switching off the ignition (page 38)
or removing the SmartKey from the starter
switch, the power windows can be operated:

until you open a door

for at least 5 minutes if no door was opened
Warning!G
If you pull and hold the switch up when
closing the window, and upward movement
of the window is blocked by some obstruc-
tion including but not limited to arms, hands,
fingers, etc., the automatic reversal will not
operate.

257 Controls in detail
Power tilt/sliding sunroof* (Coupe)
Switch on the ignition (page 40).Opening and closing the power
tilt/sliding sunroof
To open, close, raise, or lower the
tilt/sliding sunroof, move the sunroof
switch to resistance point in the
required direction of arrows1 to4.
Release the sunroof switch when the
tilt/sliding sunroof has reached the
desired position.
Fully opening (Express-open) and
closing (Express-close) the power
tilt/sliding sunroof
To open, close, raise, or lower the
tilt/sliding sunroof, move the sunroof
switch past the resistance point in the
required direction of arrow1 to4
and release.
The tilt/sliding sunroof opens or closes
completely.
!To avoid damaging the seals, do not trans-
port any objects with sharp edges which can
stick out of the tilt/sliding sunroof.
Do not open the tilt/sliding sunroof if there is
snow or ice on the roof, as this could result in
malfunctions.
The tilt/sliding sunroof can be opened or closed
manually should an electrical malfunction occur
(
page 430).
!Please keep in mind that weather conditions
can sometimes change rapidly. Make sure to
close the tilt/sliding sunroof when leaving the
vehicle. If water enters the vehicle interior,
vehicle electronics could be damaged which is
not covered by the Mercedes-Benz Limited
Warranty.
iWhen the tilt/sliding sunroof is open, reso-
nance noises may result in addition to the usual
wind noises. They are caused by minimal pres-
sure changes in the passenger compartment. To
reduce or eliminate these noises, change the po-
sition of the tilt/sliding sunroof or open a side
window slightly.
iYou can also open or close the tilt/sliding
sunroof using the:

SmartKey (summer opening/convenience
feature) (
page 253)
Depending on current position, the tilt/sliding
sunroof may also open or close when:

the air recirculation button, in the con-
trol panel of the climate control
(
page 191) or automatic climate control
(
page 201) is pressed and held
or

the charcoal filter buttone in the control
panel of the automatic climate control
(
page 201) is pressed and held.