Mercedes-Benz 2009 CLK-Class Operator's Manual page 191

A quantity of outside air is added after
approximately 30 minutes.
X
Deactivating: Press button
The indicator lamp in the button goes out.
i
The manually selected air recirculation
mode is deactivated automatically:
after 5 minutes if the outside
R
temperature is below approximately
41‡ (5†)
after 5 minutes if the air conditioning is
R
turned off
after 30 minutes if the outside
R
temperature is above approximately
41‡ (5†)
13 USA only
14 Canada only
Charcoal filter
An activated charcoal filter markedly reduces
again. bad odors and removes pollutants from air
,
entering the passenger compartment. The
charcoal filter can be activated or
deactivated.
The system switches automatically to the air
recirculation mode, if the charcoal filter is
switched on and carbon monoxide (CO) or
nitrogen oxide concentration of the outside
air increases beyond a predetermined level
i The automatic air recirculation mode
does not function if the A/C mode is
deactivated (indicator lamp in button
13
or
2
temperature has fallen below 41‡ (5†).
X
Activating: Press button e.
The indicator lamp in the button comes on.
i The activated charcoal filter should be
switched off when windows fog up on the
14
not lit), or if the outside
9
Controls in detail
Climate control system
inside, or if the passenger compartment
needs to be quickly heated or cooled down.
X
Deactivating: Press button e.
The indicator lamp in the button goes out.
Residual heat and ventilation
This feature is only available in Canada
vehicles. 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.
i How long the system will provide heating
depends on the coolant temperature and
the selected temperature. The blower will
run at low speed regardless of the air
distribution control setting.
X
Activating: Switch off the ignition.
X
Press button 9.
The indicator lamp in the button comes on.
X
Deactivating: Press button 9.
The indicator lamp in the button goes out.
Z
189