[Fulltiming]

Take a good look at the HCV, I suspect that it has a crack in the plastic housing. I had one that did the same thing. Newell spent an hour or so tracking down air leaks and pronounced it good to go. It was hold air fine. I parked it outside on one of their spaces, leveled it and it started leaking air like crazy. Tommy quickly found the culprit. The left rear HCV had a crack in the housing. It only occurred when the HCV was raised above the normal ride height. We pulled it back in the shop and replaced they replaced the HCV and all was good again. At normal ride height it wasn't leaking, raise that side and you could hear the leak.