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      08-12-2019, 03:45 PM   #314
CatalinP
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Drives: BMW X5 F15 2014 3.0xd
Join Date: Aug 2017
Location: RO

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In AUTO, those buttons you mention control the MAXIMUM fan speed (ventilation speed). In other words, it you set it to max (5), it will adjust the ventilation between MIN and MAX as needed to maintain the set temperature.
However, if you set it to middle (3), it will only adjust ventilation between MIN and stage 3 (of 5).

It's worth reading the owner's manual...
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