2009 Mercedes R-Class Owner's Manual - Page 186

Controls in detail Climate control Rmost efficient blower speed and heating power, depending on outside temperature flows onto the windshield and the front door windows (side air vents must be open) air conditioning compressor switches on at outside temperatures above approximately 41‡ (5†) for airdrying or X The indicator lamp in button | goes out. The indicator lamp in button 9 comes on. Turn temperature control 1 and/or 7 (Y page 178) slightly in any direction. Heating switches to the temperature that was set before the front defroster was switched on. The indicator lamp in button | goes out. The indicator lamp in button 9 comes on. Windshield fogged on the outside X X Rair Switch the windshield wipers on (Y page 122). Press air distribution button a or Y. Rthe 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. Adjustments You can adjust the air volume and the temperature when the front defroster is switched on. The air flow will remain on the windshield and front door windows. X Press button Ï to decrease or button Q to increase air volume to the desired level. The air volume decreases/increases to the next lower/higher blower speed and heating switches to the temperature that was set before the front defroster was switched on. i The air conditioning compressor remains on even if the indicator lamp in button | goes out. This helps to prevent the windshield from fogging. Deactivating X Press button | again. The indicator lamp in the button goes out. Defrosting is turned off. The previous settings are once again in effect. The air conditioning compressor remains switched on. 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 i To deactivate, you can also press button ´ or U. Activating: Press button :. The indicator lamp in the button comes on. 184