It must be an aftermarket radiator then. It's a new car to me so I'm not sure of the radiator's history.

Yeah, I figured I'd just have to remove the lower radiator hose, but it was really bugging me that I couldn't find a drain plug.

speaking of hoses, anybody have a good tip for getting a hose off that hasn't been removed for a loooong time. Mine seems to be pretty well baked onto the radiator.