2002 Mercedes CL-Class Owner's Manual - Page 180

The system automatically switches from air recirculation to fresh air: • after 30 minutes if the outside temperature is above about 40°F (5°C), • after 5 minutes if the outside temperature is below about 40°F (5°C), • after 5 minutes if economy mode ACOFF is selected. The system switches automatically to air recirculation at high outside temperatures. A quantity of outside air is added after a maximum of 30 minutes. Important! If the windows should fog up from the inside, switch from recirculated air back to fresh air. Activated charcoal filter An activated charcoal filter markedly reduces bad odors and removes pollutants from air entering the passenger compartment. Select activated charcoal filter: The indicator lamp in the e button is not illuminated. Press e button briefly. The indicator lamp in the button illuminates. Switch off activated charcoal filter: The indicator lamp in the e button is illuminated. Press e button briefly. The indicator lamp in the button goes out. The system switches automatically to the air recirculation mode, if the carbon monoxide (CO) or nitrogen oxides (NOX) concentration of the outside air increases beyond a predetermined level. The automatic air recirculation mode does not function if economy mode ACOFF is selected or if the outside temperature has fallen below 40°F (5°C). Automatic climate control Instruments and controls Operation Driving 177 Instrument cluster display Practical hints Car care Technical data Index