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If your problem is volume of airflow it may be worth pointing out that my F15 does not operate like my old E53, which, when you put it in auto would do the lot - temp and air flow.
The F15 never seems to boost the airflow beyond the fan speed setting you select manually, even when you select auto.
My experience is that if you set the fan speed to max whilst the climate is set to auto, it will use all available air flow if it needs to, but if your fan speed is set to anything less than that, it won't and will peak at your selected setting.
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