hi Jenny, may i know whether the "whirring noise" problem has been rectified?
i am experiencing the same problem, the humming/whirring sound seems to be more evident after revving and when the car is on eco-pro mode. am sure the problem emanates from something in the air cond system, as the noise would be gone immediately after turning off the aircond (with the fan remaining on). The noise is not present all the time though, maybe 60-70%.
so accordingly dealer didn't hear the noise despite taking the car out for a drive. then they had the compressor diagnosed, but no problems detected. so they cant order any part. been driving for 2 months with this problem, from the very first day. dealer is asking from more input from me but really i cant describe the problem anymore. Would appreciate more discussion on this as i know very little about car especially BMW.