Thx! I may give this a try. Now that it's getting warm out again, I have my windows open more, and it's pretty annoying.Hey all! So here's a super simple fix to the obnoxious whistle coming from the driver's side mirror-- which admittedly took me some time to pinpoint. I'm sure there's a handful of other fixes out there, but this worked for me.
Run some RTV along the seam. I ran some painter's tape along the outside of the mirror just to keep a clean line, but otherwise it's just that simple. Whistle gone.
Hope this helps.
Cheers!