2001 Mercury Cougar Leaking coolent from very bottom of car

When backing out from parking the engine still cold I noticed what looked like A/C condisation. I drove it home about 3 miles and kept my eye on temp guage and it didnt look like nothing was wrong. The next morning my coolent water was a large spot and still dipping out of a pipe connection opening about 5/8. The problem is I could not find any hose near to reconnect. Is there a plug that blew out?