I have an 2018 835r with about 600 hrs on it. The other day I was driving along and heard a loud hiss and a bunch of steam from the engine area. I stopped and noticed where the a/c lines come off the compressor they run right next to the exhaust manifold. The top a/c line off the compressor sits about 1 inch from exhaust. It melted all the protective heat shield foam off of it and melted all the way through the hose. There is also a wiring harness above the manifold that runs along the back of the cab and I noticed the sheath around the wiring is melted off there also. I took it to dealer because I have about 20 some days of warranty left we’ll have to see what they do to fix this problem. If I were you I would check that a/c line and maybe wrap it in heat shield of some sort.