2001 Mercedes C-Class Owner's Manual - Page 162

Air recirculation Select air recirculation: Press button O briefly. The indicator lamp in the button illuminates. To switch off the air recirculation: Press button O briefly. The indicator lamp in the button will go out. Switching on air recirculation and activating convenience closing of power windows and sliding/ pop-up roof: Press button O for more than 2 seconds, the side windows and the sliding/pop-up roof will be closed. The indicator lamp in the button lights up. Switching off air recirculation and activating convenience opening: Press button O for more than 2 seconds, the side windows and the sliding/pop-up roof return to the position they were in before closing. A window or the sliding/pop-up roof opened manually after convenience closing will no longer be returned to the position it was in before closing when convenience opening is selected. Automatic climate control Instruments and controls Operation Driving 153 Instrument cluster display 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 S is selected. The system switches automatically to air recirculation at high outside temperatures. A quantity of outside air is added after about 30 minutes. If the windows should fog up from the inside, switch from recirculated air back to fresh air. Practical hints Car care Technical data Index