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I pulled the bottom and top radiator hoses to flush out the radiator. Water runs through the radiator with no problem, but I never was able to get the draincock to work.
The radiator seems to be working ok, it's just weird that the drain doesn't work.
I worked on a '95 F-350 PSD this summer, and the plastic radiator petcock would unscrew from the plastic radiator, without coming all the way out. Once it was turning freely, though, it would pull out all the way with a gentle tug (it had an o-ring on it), so you could clean it better.
I do not know if Rangers are the same way, though, so if you try, be careful not to break any of that brittle old plastic.
Try opening the valve all the way and pushing a small wire up the tube back and forth. Soon the dirt will come out and then antifreeze. will drain out. Get the radiator flushed and put in new fluid.