Was it like a high pitched sound coming from the passenger side footwell? And could you only hear it when the air con fan speed was low? like 1 bar?
If so then it is the air con motor. Because mine makes this noise and it only goes away when I turn the fan speed up to at least 2 bars. It only makes the noise at 1 bar. I have read about this problem in a technical service bulletin for the 5th gen before and it says some owners have reported this but nothing on how to fix it. So I think it is normal and only certain people can hear it because different people can hear different frequencies and not all people can hear the really high frequencies.
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