Known overheat issues 4.7 RAM V8? EDIT FIXED

Well guys it turned out to be an "easy fix" as the internet says. The son had replaced the T stat and PUT IT IN BACKWARDS. At some point he had pulled it back apart and turned it around, works fine now. LOL I appreciate all the comments
Great to hear the repair was easy. It should have got hot once and then heat would make it to the thermostat and it would open. At that time it would work as designed. Had a slant overhauled at the hi school I had gone to as I had no place to work on it. The thermostat I had bought would not fit the correct way, so a student installed back asswards. That is how I come on that bit of information.