radiaotor overheating/watering coming through cap

One day i was driving and I notice the car temperture was raiseing above normal. About 5 mins later I notice steam/water coming through radiator container. So I began driving with nothing in the cooling container and the car was overheating but not as fast. Yesterday I bought some dex anti freeze coolant and once i put some in the car it overheated in like 20 seconds.

How is this different from the problem you posted on August 26/08, and to which I replied the next day?