After rereading Chris's post
After reading Chris's post again, I think we may be steering him in the wrong direction. As he has posted that the green coolant is coming out of the end of his top radiator hose. If this is really the case, then his hose has broken down internally and is seeping coolant out of the thread ends. I've had this problem in the past, and generally a new hose fixes the leak.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan