My experience has been that when in auto, fan speed will vary based on the delta between set temperature and actual temperature inside the X7. That said, sometimes it seems like the "delta" necessary for the fan to increase speed automatically is higher than you would think, and sometimes I end up manually adjusting the fan speed if I want to cool off quicker.
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///M3 COMPETITION 6MT - 2017 F80 Smoked Topaz Metallic
BM3 / MP-HAS / GC Camber Plates / Carbonstructure Interior
X7 XDrive 40i ///M-SPORT - 2020 G07 Arctic Grey Metallic
X3 XDrive 30i - 2019 G01 Mineral White (wife's) / 128i 6MT - 2009 E82 Jet Black (son's)
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