I had a similar problem on my 2015 XC60. It was there for a couple of years and the dealer couldn’t hear or detect it, but it was there after driving for a period of time. I turned off the A/C and the noise stopped. If I stopped the engine it would take a long time for it to start again.
Eventually I managed to get one of the technicians to hear it and it was a noisy Air Conditioning Compressor. Replaced under warranty and all has been good since then. Fingers crossed.
I totally understand that the problem that you are experiencing may be nothing to do with the A/C, but at least it will eliminate it, if it makes no difference to the sound you are hearing.
Bob
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MY15 XC60 D4 AWD SE Lux Nav Geartronic, Saville Grey, March 2015.
DSP; Winter Pack with ABL; Security Pack; Front & Rear Park Assist; Reversing Camera; Gear Shift Paddles; Tempa Spare Wheel & Jack. Blackvue DashCam. Road Angel Pure.
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