First it is always a good idea to post the year and model of your vehicle. You can do that in your signature so that it is permanent. If you see coolant on the ground it is never a good sign, it will only get worse. The lack of heat is due to no pressure build up. Without pics it is hard to offer an opinion but I'm guessing you should opt for a new radiator. When you say that steam is coming out of the drivers side is that the drivers side of the radiator. Do not try to refill the radiator while the car is hot, you can easily ruin the heads or crack the block. The safest and permanent fix will probably be a new radiator. You can take a chance on a J/Y but it'* still a gamble. Just my two cents worth.
1995 Bonneville SSEI
1994 Buick Park Avenue