Mercedes-Benz 2003 C-Class Wagon Operator's Manual page 142

Controls in detail
Climate control
Deactivating
Press button P ( page 145).
The indicator lamp on the button goes
out. Defrosting is turned off.
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.
Warning!
When the outside temperature is below
41°F (5°C), only switch to air recirculation
mode for short periods to prevent window
fogging.
148
Activating
Press button O ( page 145).
The indicator lamp on the button
comes on.
i
If you keep button O pressed the
side windows and sliding/pop-up roof
will be closed.
The air recirculation mode is activated
automatically at high outside tempera-
tures.
If you have turned off the air condition-
G
ing or the outside temperature is below
41°F (5°C), the air recirculation mode
will not switch on automatically.
Deactivating
Press button O ( page 145).
The indicator lamp on the button goes
out.
i
If you keep button O pressed the
side windows and sliding/pop-up roof
will be returned to their previous posi-
tion.
The air recirculation mode is deactivated
automatically:
after five minutes if the outside temper-
ature is below approximately 41°F
(5°C)
after five minutes if the air conditioning
is turned off
after 30 minutes if the outside temper-
ature 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.