2001 Pontiac Grand Am anti freeze from overflow

2001 Pontiac Grand Am V6 Two Wheel Drive Automatic 91000 miles

Hi, I noticed the check coolant level in the overflow was empty, so I filled it up and drove for about a 1/2 hr and I shut the engine off. When I started it the light came on a gain and when I checked the overflow tank it was empty again. So I filled it up and I drove it again and I noticed the temp. Gauge was about 200 and when I stopped I checked the over flow and it was empty again and the heater was blowing cold air. By the way I noticed pretty much I was loosing the coolant from the overflow tank hose that is on the top of the tank. Please can you tell me what do I need to do here?
Thank you