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Adding another data point for the M8 vs M850i on the AC. I've got a relatively early 2019 build M850iC and the AC is flawless. I've always felt BMW AC really sucks. My wife's LX570 blows super cold and the last 5 BMW's I've had never came close, until I got the M850iC. Long trips, short trips, 115 degrees, it just works. And I am also knocking on wood, double skipping over lines in the sidewalk, etc. I don’t want to jinx it either, first 'real' AC I've had in a BMW.
But my previous F90 M5 was terrible. It was 'within specifications' which means you are hot when it's over 95. Max AC would barely make a sheet of paper wiggle in front of the vents. My M4 was also really bad. Both would dim the cooling on engine load. I never had it shut off like the OP, but it wasn't great. I wonder if that is a common M car trait. Can't believe the components wouldn't be the same for an AC across the model line, but who knows.
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