2007 Mercedes E-Class Owner's Manual - Page 232

Controls in detail 4-zone automatic climate control Air recirculation mode Switch to air recirculation mode to prevent unpleasant odors from entering the vehicle from the outside (e.g. before driving through a tunnel). This setting cuts off the intake of outside air and recirculates the air in the passenger compartment. Warning! Activating Press button , ( page 222) or ( page 223). The indicator lamp on the button comes on. matically at high outside temperatures and if the concentration of carbon monoxide (CO) and nitrogen oxide in the outside air increases, for example in a tunnel. The indicator lamp on button , is not lit when the air recirculation mode is automatically switched on. A quantity of outside air is added after approximately 30 minutes. Deactivating Press button , ( page 222) or ( page 223) again. The indicator lamp on the button goes out. tomatically: 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 air recirculation mode is activated auto- i The air recirculation mode is deactivated au- G Fogged windows impair visibility, endangering you and others. If the windows begin to fog on the inside, switching off the air recirculation mode immediately should clear interior window fogging. If interior window fogging persists, make sure the air conditioning ( page 233) is activated, or press button P or 0. 231