2004 Mercedes E-Class Owner's Manual - Page 180

Controls in detail Climate control Close center air vents. Open left and right side air vents and adjust side air vents upwards. Deactivating Press button P. 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! Activating Press button O. The indicator lamp on the button comes on. i The air recirculation mode is activated automatically at high outside temperatures. If you have turned off the air conditioning ( page 182) or the outside temperature is below 41°F (5°C), the air recirculation mode will not switch on automatically. G When the outside temperature is below 41°F (5°C), only switch to air recirculation mode for short periods to prevent window fogging. 180