I have never heard about this issue in any generation, let alone 5th gen. The AC in my 2017 Ram 1500 SLT blows ice cold. It's Brilliant Black w/color matching canopy, diesel gray cloth interior. She gets hot in the sun! We're having the hottest summer ever here in Southern Alberta. Just did a camping trip where she towed a 2500lbs travel trailer and close to max on the payload. We're a family of four and we were comfortable the whole time. I am glad I now know about this issue. Really debating on moving up to a new 2500. Something to consider.