2008 Mercedes CL-Class Owner's Manual - Page 496

Controls in detail Automatic climate control Activating Press button ; ( page 491) up or down. The indicator lamp on the button comes on. The air conditioning 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 side windows the air conditioning compressor switches on at outside temperatures above approximately 41°F (5°C) for air-drying the air recirculation mode is switched off 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 door windows. Press button Q up or down to increase or decrease air volume to the desired level. The air volume increases/decreases to the next higher/lower blower speed and heating switches to the temperature that was set before the front defroster was switched on. The indicator lamp on button ; goes out. or Press temperature control %$ 2 and/or a ( page 491) upward or downward. Heating switches to the temperature that was set before the front defroster was switched on. The indicator lamp on button ; goes out. even with the indicator lamp on button ; goes out. This helps to prevent windshield from fogging. i The air conditioning compressor remains on Deactivating Press button ; ( page 491) up or down. The indicator lamp on the button goes out. The previous settings are once again in effect, except air recirculation mode stays off. Windshield fogged on the outside Switch the windshield wipers on ( page 400). Press button U ( page 491) up or down. The indicator lamp on the button comes on. 495