2003 Mercedes S-Class Owner's Manual - Page 180

Controls in detail Automatic climate control Defrosting 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! Warning! G i These settings should only be selected for a short time. Activating Press button P ( page 175). The indicator lamp on the button lights up. Switch off air recirculation, if selected. Press button O ( page 175). The indicator lamp on the button goes out. Close center air vents. Adjust side air vents upwards. Deactivating Press button P ( page 175). The indicator lamp on the button goes out. Defrosting is turned off. Never operate the side windows and the sliding pop/pop-up roof if there is the possibility of anyone being harmed by the closing procedure. In the event that the procedure causes potential danger, the closing of the side windows can be immediately halted by pressing the respective window switch. The closing of the sliding/pop-up roof can be immediately halted by moving the sliding/pop-up roof switch in the overhead control panel in any direction. G When the outside temperature is below 41°F (5°C), only switch to air recirculation mode for short periods to prevent window fogging. Activating Press button O ( page 175). The indicator lamp on the button lights up. i If you keep button O pressed, the side windows and the sliding/pop-up roof will be closed. 180