Cracking a window neutralizes the cabin pressure so the air is no longer going between the hardtop seal and the frame to make the whistle noise.
More information here
https://www.bronco6g.com/forum/threads/cold-weather-wind-noise.105926/post-2407048
If it is only happening when it is cold and when the HVAC is running, then it is likely a whistle coming from the weather stripping gap between the frame and the mid panel of the hardtop.
I had a similar issue happening last winter and the fix was some pipe insulation in the channel of of the...
Curious to see if there are any issues with the Painted tops once we get more of them out on the street.
Have we confirmed the manufacturer and materials of the top are different than from the MIC top?
Yup - my dealer was confused when then received my MIC top without windows. I had to literally explain to my Ford dealer that they had to swap all of the glass from my old top to the new top.
The pipe insulation specs are in this thread. I didn’t do any of the other things that they did
https://www.bronco6g.com/forum/threads/mic-hard-top-wind-noise-reduction-2023-edition-plus-bonus-fix-for-bad-adhesive.64146/
I made a platform to fill the gap between the middle of the back seat and the center console
I bought a bunch of foam from a craft store and glued it together. From there I took measurements and then drew on the foam with a marker to pinpoint where I would cut. I then used a carving knife to...