How fast would it be leaking if it was a freeze plug? Also, I was feeling around and I think it might be leaking out of a metal hose that runs from the top left side of the radiator into the block or something behind the water pump. If it's not that hose then I think it might be a plug or bolt that I can feel next to it. Still have yet to pressurize the system but if you got anything that might help me out please do so.