See also:

Maximum cooling
Press the button. The system is set to the lowest temperature, maximum air volume and recirculated-air mode. Air flows out of the vents for the upper body region. Open them for this purpose. ...

Sound output
Switching on/off When the ignition is switched off: press ON/OFF button on the radio. Muting When the ignition is switched on or the engine is running: press the ON/OFF button on the radio. ...

Deactivating HDC
Press the button again; the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...