Seen worse but most can be cleaned up. Spent a lot of hours flushing one out. Even had to pull the radiator out a couple of times until the engine quit loading it up and that was after flushing the engine many times! A buddy made a tube with a screen to install in the top hose to catch debris but you really have to pay attention to your temp gauge because it didn't take much to clog it and impede flow. It's better than clogging the radiator though but you had better not go very far until things are clean. It was a hassle to clean the radiator but at least when it started clogging up, temps would rise much slower and you could head home and get there before it overheated.
if you wouldn't mind could you tell me how to flush the engine and do a coolant flush without the radiator so I can get to work on that.
I adapted fittings to be able to hook up a garden hose to the lower engine hose and turn on the faucet. Disconnect the upper hose from the radiator and let it dump. You can also get a flush kit from an auto parts store but I think my way was faster. Remove the T-stat either way....run the engine to let the pump to the work. I also like to isolate and flush the heater core separately. Again, I think things go faster doing it like that.
How would you know that??
