My V70 D5 has a similarly noisy AC compressor. One Volvo specialist I have visited said they all do that, just leave it. The better one said that the bearings tend to go in the compressor. There are many threads on noisy AC with these cars, my plan is to find an AC specialist and seek their recommendations.
Mine sounds worse on overrun and sounds like gearbox whine. I’ve changed my gearbox oil twice before I noticed that turning off the AC stops the noise.
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2010 V70 D5 SE LUX Manual
Polestar
Silent Coat sound insulation
Koni Active shock absorbers
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