Freddie Franklin

I'm having the same issue with my '20 trailboss. Truck is at the dealership for the whistle for the 4th time so they said it's been escalated to engineering. The first 3 times they said "unable to replicate". I hear my whistle soon as I crack a window/sunroof at 60+ and considerably louder when setting hvac to recirculation. Theyve had the truck for almost 2 weeks now so hopefully I'll have an update soon.