Agreed -- although we had the warmest Southern European summer in a while, I share the "weak A/C" deficiency, never experienced in my former 2011 X5 50i.
One difference and probable cause is the unavailability of the option 358 in the new F85 X5 M, the "infrared shielding" windscreen; it's on the option list but it is practically unavailable because of the rear mirror mounted front looking camera supporting the safety features standard (meaning compulsory) on the X5 M sold here.
On sunny summer days I distinctly recall the leather covered dashboard never becoming so hot in the former X5, so the A/C in the new X5 M has a vastly higher thermal load inside the car to work against.
I'm afraid we're stuck with it -- at least, MAX A/C is noisy but cools more than enough.
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