John, I hate to bring you bad news, but while I was looking at the fotos of your engine to see what it was that is leaking, I found this. And I still don't know where it is leaking. Hope this helps.

http://www.carcomplaints.com/Chevrolet/Malibu/2002/cooling_system/coolant_leaking.shtml

It sounds like the shaft seal on the water pump has gone bad. Replacement of the water pump is the only way to repair it.