2005 Mercedes CL-Class Owner's Manual - Page 194

Controls in detail Automatic climate control Air recirculation mode Warning! 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! 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 beyond a predetermined level, for example in a tunnel. Please note that the charcoal filter must be activated ( page 193) for the air recirculation mode to be activated automatically. If you have turned off the air conditioning ( page 195) or the outside temperature is below 41°F (5°C), the air recirculation mode will not switch on automatically. Deactivating Press button , ( page 188). The indicator lamp on the button goes out. Never operate the side windows and the tilt/sliding sunroof 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 releasing the , button or by pressing the respective window switch. The closing of the tilt/sliding sunroof can be immediately halted by releasing the , button or by moving the tilt/sliding sunroof 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 , ( page 188). The indicator lamp on the button comes on. i If you keep button , pressed, the side windows and the sliding/pop-up roof will close. 192