Thanks Maroon, you are so right!

The coolant overflow isn't from the radiator cap, but from a small black hose about 4 inches long that comes out the top of the radiator. My Dad informed me that it was an overflow hose, and suppposedly they go into overflow or recycling containers. But my 'stang didn't/doesn't have one. It only leaks a little if the car is very warm. At first the hose was trapped against the back of the radiator, so it used to dribble down it, making me think my radiator was stuffed. But once we found the hose and directed it down the side , the 'leaking' radiator stopped. Does your 'stang have one of those recycle containers?, do you know if mine is supposed to?
Thanks! , Nicolette