2006 Mercedes CLK-Class Owner's Manual - Page 205

Controls in detail Automatic climate control (CLK 500/CLK 55 AMG) Deactivating Press button , ( page 197). The indicator lamp on the button goes out. i If you press and hold button ,, 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 ,. A side window that was moved will remain in its current position if button , is used to re-open the remaining side windows. 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 The air recirculation mode is deactivated automatically: after 5 minutes if the outside temperature is below approximately 41°F (5°C) after 5 minutes if the air conditioning is turned off after 30 minutes if the outside temperature is above approximately 41°F (5°C) 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). 204