The OEM fan is loud at full speed. With temps @105F here, it will be running almost all the time. Plus, the mechanical fan engaging will sound louder too. It's bad. Even my A/C that can get to 42F is struggling a bit. Once it's going, it's good. The temps are crazy. I'm more worried about a cooling pipe breaking or something. Hook up a scanner and read temps as you are driving or sitting idle. Mine goes from 193-205F with current outside temps.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)