2007 Mercedes CLK-Class Owner's Manual - Page 208

Controls in detail Automatic climate control Charcoal filter An activated charcoal filter markedly reduces bad odors and removes pollutants from air entering the passenger compartment. The charcoal filter can be activated or deactivated. The system switches automatically to the air recirculation mode, if the charcoal filter is switched on. carbon monoxide (CO) or nitrogen oxide (NOX) concentration of the outside air increases beyond a predetermined level. i If you press and hold button e, the side windows will close. Deactivating Press button e ( page 199). The indicator lamp on the button goes out. i The activated charcoal filter should be switched off when windows fog up on the inside, or if the passenger compartment needs to be quickly heated or cooled down. i If you press and hold button e, the side windows will return to their previous position. A side window will only return to its previous position if it has not been moved to another position using the respective side window switch after it was closed with button e. A side window that was moved will remain in its current position if button e is used to re-open the remaining side windows. Warning! G Never operate the side windows if there is the possibility of anyone being harmed by the closing procedure. When using the charcoal filter with convenience closing feature, should the upward movement of a window be blocked by some obstructions including but not limited to arms, hands, fingers. etc., the automatic reversal feature will not operate. In the event that the procedure causes potential danger, the closing of the side windows can be immediately halted by releasing the e button or by pressing or pulling the respective window switch. i The automatic air recirculation mode does not function if the A/C (indicator lamp on button 2 or 9 not lit) mode is deactivated, or if the outside temperature has fallen below 41°F (5°C). Activating Press button e ( page 199). The indicator lamp on the button comes on. 207