2008 Mercedes C-Class Owner's Manual - Page 256

Controls in detail Dual-zone automatic climate control Front defroster You can use this setting to defrost the windshield, for example if it is iced up. You can also defog the windshield and the side windows. i You can adjust the temperature and the air volume when the front defroster is switched on. Windshield fogged on the outside Deactivating: Press button y ( page 250) again. The indicator lamp in the button goes out. Defrosting is turned off. The previous settings are once again in effect. i Keep this setting selected only until the windshield is clear again. Switch the windshield wipers on ( page 117). If the automatic mode of the climate control is switched off: Press button Z ( page 250) repeatedly until one of the following symbols appears in display b: a or Y ( page 250). i Keep this setting selected only until the windshield or the side windows are clear again. Activating: Press button y ( page 250). The indicator lamp in the button comes on. The air conditioning switches automatically to the following functions: cooling on to dehumidify most efficient blower speed and heating power, depending on outside temperature air flows onto the windshield and the front side windows the air recirculation mode is switched off i To switch defrosting off, you can also press i The cooling remains switched on. button ´, U, ·, Q or temperature controls 1 and 6 ( page 250). 255