Blow out the radiator itself. It should spray out some fluid. I usually get very little fluid out of them when disconnecting.
Once you are ready to start the car, you can check flow from the transmission output line. I think it's the lower one, but to be safe, lead hoses from both lines to a bucket, start the car and run for 20seconds. You should have about a quart of fluid in the bucket. Refill with fresh fluid. You can check radiator flow in a similar manner by hooking up the feed line, and fashion an output line/hose from the radiator to the bucket.
