2007 Dodge Charger over heating

The first thing you must do is go get a cooling system pressure test done. This is a quick and simple test that will show up any external leaks, do not use any stop leak product as this will cause extra problems and it will not sole the problem you have now. Report what is leaking or if nothing is found get a head TK leak test done as well, this is a simple chemical test to see if you have exhaust leaking into the coolant which is a positive indicator for a head problem.