I had a 2014 Durango and it had a wind whistle at highway speed when there was a cross wind or strong head wind. Dealer couldn't figure it out. We took a new Durango from the lot for a drive and it whistled just like mine. I told the dealer there should be a bulletin on it if two of them both whistled. They found out that it was where the washer fluid hose goes over the weather stripping in front of the fire wall. The fix was to move the hose from the built in clip on the underside of the hood to a new location about two inches down to a round hole in the hood. I think it is a drain hole for between the two layers of the hood. They put a loose or floating clip in there to hold the hose. It fixed the problem unless there was a really strong wind and the there was usually a noise coming from somewhere else anyway. The part that is very stupid is that my 2017 is designed exactly the same wayand has the same whistle..You would think the geniuses at Chrysler would have figured It out by now and had a new design for it. Need to get a proper clip for this one to fix the problem. Had lots of other problems with the 2014 but still loved the vehicle so bought another one.. Hope this is in the shop less than the last one