2003 Mercedes SL-Class Owner's Manual - Page 150

Controls in detail Automatic climate control Adjusting the temperature for center and side air vents When outside temperatures are low, you can manually raise the air temperature for the center and side air vents. The controls 3 are located between the center air vents ( page 147). Turning on warm air Press the left button (red). The indicator lamp on the button lights up. Warm air will enter from the center and side air vents. Turning off warm air Press the left button (red). The indicator lamp on the button goes out. The air from the outlets will return to the temperature set in the system. Turning on cooler air Press the right button (blue). The indicator lamp on the button lights up. Cooler air will enter from the center and side air vents. Turning off cooler air Press the right button (blue). The indicator lamp on the button goes out. The air from the outlets will return to the temperature set in the system. Adjusting air volume Use the air volume control 10 ( page 148) for both automatic and manual air volume adjustment. Adjusting manually Press the control knob. The U light on the control knob goes out. You can now select one of nine air volume settings. Adjusting automatically Press the control knob. The U light on the control knob comes on. The airflow is adjusted automatically. 150