Max defroster increases the fan speed and temperature. Air conditioning is activated and air recirculation is unavailable while max defroster is active. When max defroster is turned off again, the climate settings return to their previous levels.
Note
When max defroster uses the high fan speed, the noise level of the fans increases.
Press the fan symbol in the bottom bar 
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.Press the max defroster symbol 
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.Tip
The defroster button 
in the overhead console activates the max defroster, as well as the heating of the rear windshield and side mirrors. If you already have either the max defroster or rear defroster activated via the center display, pressing the defroster button in the overhead console will activate the second function. Press the defroster button again to turn both off.
in the overhead console activates the max defroster, as well as the heating of the rear windshield and side mirrors. If you already have either the max defroster or rear defroster activated via the center display, pressing the defroster button in the overhead console will activate the second function. Press the defroster button again to turn both off.