low buzzing noise from dashboard
Our cars have little servo motors that operate the inner doors of the ventilation system. Normally, when they go bad, you get a clunk-clunk-clunk-clunk sound from under the dash under certain conditions. It's possible that one of the motors could have a gear completely stripped out and freely spinning.
There are two sets of these motors: One set under the dash in the driver-side footwell, closest to the center stack, the other set is located behind the glove box. You might want to listen closely to those areas to try and narrow it down.
Either way, it should be easy to discern whether either of these two things are the culprit.
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The monsoons do give off a buzzing sound though, but the one from under the dash is something else.



