slant is running hot

It just sounds like a typical clogged up mopar radiator to me. I have seen them do that same kind of crap over and over again. I flush mine out every year NO MATTER WHAT!!!!! I dont care if it needs it or not. It probably just got REALLY clogged up. You will more than likely have to do a really serious flush on it. I hope someone will chime in and give you a good product to use that will work on a heavy clogging problem. I dont really know what to suggest because I've never let mine get that bad before. I've seen other people have to deal with it a lot though.