I had a similar issue with my V60 2015. The sound was most noticeable from the drivers side A pillar fan unit which is connected to the a/c system, caused by insufficient refrigerant in the low pressure a/c circuit leading to cavitation within the system. Cured the problem by topping up the refrigerant, Groupon sometimes have good offers for a/c service. The noise didn't disappear completely but 90% better.
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