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Hi,

Recently purchased a brand new 4 series (2021). About a week ago, I started noticing a strange whining noise coming from the inside of the car when the A/C is on and the Start/Stop function is operating. Whining normally happens when I come to a stop or accelerating from the stop (basically when the A/C kicks).

I've made a recording and you should be able to hear the noise at 0.26 and 0.34: New Recording 2.m4a

Went to a dealership, but after having the car for 2 weeks and taking the dashboard out, they didn’t solve the issue.

Also found another perso with the same issue on YouTube:

Does anyone have the same issue or has a solution? Would very much appreciate that.
 

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1& 2 series forum try 4addicts better still its under warranty take the thing back. If they can't fix the issues reject the car.
 

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Could it be a noisy air con system. I’ve has similar noses on domestic products and the R600a gas used makes “farmyard” type noises in some systems. Re gas with a new drier usually sorts the issue out.
 
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