2009 Mercedes S-Class Owner's Manual - Page 186

Controls in detail Climate control system Function g h % Temperature control, driver's side, lowering , Air recirculation Recommendation/Notes (Y page 186) i Set the temperature to 72‡ (22†). i Only use this function for a short time, e.g. in a (Y page 192) tunnel. Otherwise, the windows can fog up due to lack of fresh air. i Switches on the automatic mode. The indicator lamp in button U comes on. (Y page 186) j U Air distribution and air volume, driver's side (automatic mode) Rear climate control Notes on climate control system The climate control system is operational whenever the engine is running. You can operate the climate control system in either the automatic or manual mode. The system cools or heats the interior depending on the selected interior temperature and the current outside temperature. It can only function optimally when you are driving with the windows, the tilt/sliding sunroof or tilt/sliding panel closed. Nearly all dust particles, pollutants and odors are filtered out before outside air enters the passenger compartment through the air distribution system. G Warning! Severe conditions (e.g. strong air pollution) may require replacement of the filter before its scheduled replacement interval. A clogged filter will reduce the air volume to the interior and the windows could fog up, impairing visibility and endangering you and others. Have a clogged filter replaced as soon as possible at an authorized Mercedes-Benz Center. The air conditioning will not engage (no cooling) if the A/C mode (Y page 185) is deactivated. 1Á Temperature control, left, raising 2 Display 3Á Temperature control, right, raising 4Â Temperature control, right, lowering 5Â Temperature control, left, lowering G Warning! Follow the recommended settings for heating and cooling given on the following pages. Otherwise the windows could fog 184