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HVAC whistle

Yooni7

Passed Driver's Ed
Location
Pudsey
Car(s)
Golf R MK7
MK7 R owner.

HVAC seems to be whistling quite loudly. I notice it most on level 4 but it's still there on the levels above but drowned out a bit by the sound of the increased air pressure.

When the AC is turned on it can get really loud but it's pretty much always there regardless of setting, opening and closing vents etc.

Any ideas of where to start with this?
 
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