Thanks guys, I took it to a radiator shop, they said they would pressure test to find if there is a leak. So, will see what they find.
Also, clamps are screw type. By the looks of all the antifreeze and where it was, it sure points to the core.
As far as the cozy III, mine has three outputs for the vents it would take reconfiguring a lot to make work.
Hoping for shop to fix.