Depending on how many times you've "boiled it" over there is damn good chance the head gaskets are blow and the heads are warpped due to overheating.


Next thing to do is to make sure there proper air flow across the condensor and radaitor.

The condensor sits in front of the radaitor, if the condensor fins are plugged up with drit and debris it could cause restrictive air flow to the radaitor which sits just behind it.

Other than that you may have an issue with the fan clutch not enguaging enough to pull more air when needed across the radaitor and condensor