Drain tubes exit either side of the transmission. My AC was blowing super cold but airflow was dropping after a few minutes. I even had ice and mist blowing out the vents! Turned out to be low on refrigerant as posted earlier by others here.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i