My car makes this buzz saw sort of noise usually when I first get it and turn it on and I haven't been about to figure out what it is. Any ideas? Video attached.
I found a video that seems to be my problem exactly:It's an air air vent thing. Search here for some other threads about dash noises. If it's the same thing, I've changed mine twice in 2 years. Available at most auto parts stores for about 40 bucks or from dealer for MUCH more. 10 minute job.
(Also 2011 convertible) Last time I changed it, I just unplugged it electrically after a function-test, and I have not had any problems. I leave the controls on floor/windshield.
To test this, unlatch/remove the glove box and reach up on the right side in there for a vibration during start. You should find it. Then you can unplug the electrical and test again to double-check. 2 or 3 screws to replace the unit.
Hopefully that helps. If that isn't it, I'm sorry, but I'm stumped.