I have a rattle near all 3 ac vents in my 03 s type. can't tell if it is the wood trim or the vent vibrating in its mounting. Any idea which likely culprit and is there an easy fix. It is not the defroster (fixed that last year). Also having sound like sand rattling around in center vent with ac on high.
All help is appreciated.

 

Is it possible you have some debris in there and the fan on high us moving it around?