My wife's 2013 X3 has been making a whiney sound, and we've isolated it to A/C related stuff because the sound would go away if we turned the A/C off. When we brought it into our dealership, they thanked us for directing the search, and diagnosed it as a damaged condenser, ordered the part, and fixed it, all under warranty. They said they had never heard a sound like that before, because BMW recently changed their A/C system (?). So they even thanked us for some valuable information!
It seems like it's a faulty part if so many people are needing a repair. Potentially being another one of their silent recalls. But definitely get it fixed under warranty.
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