Just stealing OP's thread for a minute, to state that i don't have an aux fan at all on my Europe spec. 2004 4.4 (N62).
Still, my aircon has always been working flawlessly. Even in 30 C. (86 F.) it provides plenty of cold air.

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2007 E70 4.8i Sport
2004 E53 4.4i Sport - R.I.P.