Originally in "Do it yourself" forum

i have a 91 voyager with a 3.3L engine. And it runs alright except when i get on the highway. Once i get on the highway it gets hot fast.and the temp needle goes to almost overheating.........to the point where the check guages lights flashes. Also the coolant container get pretty full. Does anyone know wut it could be? IOm thinkin maybe the radiator becasue it doesnt look to god at the moment. Maybe it needs a cooling system flush?.can anyone help>?