2004 Mercedes E-Class Owner's Manual - Page 191

Controls in detail Automatic climate control* 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. Warning! G i The air recirculation mode is activated automatically: at high outside temperatures if the concentration of carbon monoxide and nitrogen oxide in the outside air increases, for example in a tunnel (charcoal filter activated ( page 192)) 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. Never operate the windows and sliding/pop-up roof* or panorama sliding/pop-up roof* if there is the possibility of anyone being harmed by the opening or closing procedure. In case the procedure causes potential danger: Vehicles with sliding/pop-up roof: The procedure for the windows can be immediately halted by pressing or pulling the respective window switch. The procedure for the sliding/pop-up roof can be immediately halted by moving the switch for the sliding/pop-up roof in any direction. The closing of the side windows and the sliding/pop-up roof can be reversed by again pressing and holding the O button. Vehicles with panorama sliding/pop-up roof: The procedure for the windows and panorama sliding/pop-up roof can be immediately halted by releasing the O button. G When the outside temperature is below 41°F (5°C), only switch to air recirculation mode for short periods to prevent window fogging. i If you keep button O pressed, the side windows and the sliding/pop-up roof* or panorama sliding/pop-up roof* or will close. 191