Just dropping by to say that after a year, the smell from my AC did not return. *fingers crossed* Although I'm working at home now, so the AC did not work nearly as hard as last year. So I set a terrible example here.
Thinking back, I think I might had gotten water in the duct while washing my car. Would very much like to know if the new plenum does make a difference.
Always happy to see the community coming together to diagnose and contribute to solving various issues. Thank you for all who contributed to this thread!
PS - also had my HW3 installed, 2 months ago I had my windshield replaced, and the rep there said that she would call me if HW3 parts are in stock, and sure enough, I got a call 5 days later. Now I see more cones on my screen.
So on your car wash point I recently had an issue with my 3 where I would experience a leak any time I would use an automated car wash bay. At the same time I noticed the smell worsening so I too think the car wash contributed if not was the original cause. As part of chasing down the leak they replaced my plenum but ultimately located the source of the leak actually up in the A pillar. I’m hoping the repair works, I’m picking it up today but as part of the process I had them do the kool-it routine and new filters hoping that it puts this problem to rest.