I'm curious about this. Was the radiator, as Toysrme suggested, heavy and encrusted? Did you flush the radiator with water when you drained it? Did you flush it with a radiator flush chemical? Did you replace the hoses when you changed the waterpump?
I'm just curious about the symptoms that lead you the the radiator as the culprit, and what you tried before you got to the replacement option.
Thanks,
JM
My radiator was not heavy, near the upper hose opening had some "gel" like stuff, whitish / red. i did flush the radiator with my garden hose for a long time. water flow out fine. i didnot use a flush chemical. I did replace the hose when i changed the waterpump, i also changed the thermostat.
The only "sign" of clogging is, after i run the car for a while, i place my hand near the fan, and it was blowing cool, normally, it should be hot. and there are parts that are cool and some are hot, that means the cool area was clogged. hope this helps.