2009 Mercedes R-Class Owner's Manual - Page 200

Controls in detail 3-zone automatic climate control The previous settings are once again in effect. The air conditioning compressor remains switched on. A quantity of outside air is added after approximately 30 minutes. If you have turned off the air conditioning or the outside temperature is below 41‡ (5†), the air recirculation mode will not switch on automatically. X 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. i To deactivate, you can also press button ´ or U. Windshield fogged on the outside X X Switch the windshield wipers on (Y page 122). Press button U. The indicator lamp in the button goes out. Air volume and air distribution are controlled separately for each zone. If the automatic air volume and air distribution are switched off: X G Warning! 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 is activated, or press button |. X Deactivating: Press button :. The indicator lamp in the button goes out. Press buttons Y/811 and a/ 711. Activating: Press button :. The indicator lamp in the button comes on. i The manually selected air recirculation mode is deactivated automatically: Rafter 5 minutes if the outside temperature is below approximately 41‡ (5†) Rafter 5 minutes if the air conditioning and air-drying are turned off Rafter 30 minutes if the outside temperature is above approximately 41‡ (5†) At outside temperatures above 79‡ (26†) the system will not automatically switch back to outside air. A quantity of outside air is added after approximately 30 minutes. i The air recirculation mode is activated automatically at high outside temperatures. The indicator lamp in button : is not lit when the air recirculation mode is switched on automatically. 11 Canada only 198