Changed Radiator

Hello All,

I recently changed the radiator on my 97 Eldorado TC. The old one seems to have been patched up, and lots of stop leak seems to have been put in the system. the radiator I removed seem to have had globs of brown looking stuff in it, sort of like wads of tobacco. So, I changed the radiator, in the meantime, when it ran hot, the transmission started acting erratically, and now with the new radiatotr, and I changed the transmission fluid ( drained the dry sump )replaced new screens and gasket, but it seems as if there is no coolant flowing to the system, the transmission lines don't get hot, nor do the radiator hoses.
Any help will be greatly appreciated!