2005 Mercedes SLK-Class Owner's Manual - Page 177

Controls in detail Climate control Activating Press air recirculation switch , ( page 175). The indicator lamp on the air recirculation switch , comes on. Warning G Deactivating Press air recirculation switch , again ( page 175). The indicator lamp on the air recirculation switch , goes out. Never operate the side windows if there is the possibility of anyone being harmed by the closing procedure. In the event that the closing procedure causes potential danger, the closing of the door windows can be immediately halted by releasing the , button or by pressing the respective power window switch. The closing of the rear side windows can be immediately halted by releasing the , button. i The air recirculation mode activates automatically at high outside temperatures. A quantity of outside air is added after approximately 30 minutes. i The air recirculation mode deactivates automatically: after 30 minutes if the outside temperature is above approximately 41°F (5°C) after five minutes if the outside temperature is below approximately 41°F (5°C) after five minutes if the air conditioning is turned off ( page 178) i If you press the air recirculation switch , and keep it pressed, the side windows will close. 177