2008 Mercedes R-Class Owner's Manual - Page 230

Controls in detail 3-zone automatic climate control* Adjusting air volume Five blower speeds are available. Press button ˜ to decrease or button Q to increase air volume ( page 224) to the desired level. The indicator lamp on button U goes out. The automatic mode is switched off. The selected blower speed appears in the display e ( page 224). Front defroster You can use this setting to defrost the windshield, such as when it is iced up. You can also use it to defog the windshield and door windows. The automatic climate control switches to the following functions automatically: most efficient blower speed and heating power, depending on outside temperature air flows onto the windshield and the front door windows (side air vents must be open) the air conditioning compressor switches on at outside temperatures above approximately 41°F (5°C) for air-drying 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. i Keep this setting selected only until the windshield or the door windows are clear again. Activating Press button | ( page 224). The indicator lamp on the button comes on. 229