Well I bought an AirEvac from Mityvac. It is supposed to create a vacuum in the cooling system and sucks fluid into the system and eliminates all the air.
While hooking up the unit and trying to create a vacuum in the system I could only get about 7 or 8 in of vacuum. When disconnecting the air line I could hear a gurgleing coming from the radiator. I traced the noise to a small crack in the front of the radiator all the way on the bottom, passenger side.
I'm getting out my JB Weld and will report back tomorrow.
larger image at
http://www.priveye.com/dls/rad1.jpg
Roscoe