My 2021 Sierra 2500 HD driving 55 mph + with windows closed has a wind noise like a window is open & a breeze is blowing through. Can hear it over the radio & A/C on. Dealer hears it & calls it wind rush & they cannot fix it. Blaming it on the truck mirrors. This noise is making me HATE this truck. If I would have taken on hi way & heard this sound, I Would Not have purchased it. Did Not have this problem with 2004 Dodge 3500 or 2016 Ford F-250 Lariat.
Please Help.