Overhauling Radiator

A few days ago, I pulled out my vans radiator because it has leaks around its neck and it needs to be fix so what I did was I dismantled it and brought it to a radiator specialist to do the job. I know how to do the job but since I have a lot of work to do during that time, I prefer to brought it to a specialist. My vans radiator tubes was already clogged up and clogging up will result to overheating becuase the water inside the radiator tubes can no longer circulate and uncirculation of water could increase its water temperature that will result to overheating. The cooling system of the engine depends on the water cycle inside the radiator that's why you need to have a good and clear passage inside the radiator tubes for a cool engine.