Thanks for the welcome. Yes the leak is at the back of the cylinder head. There is fresh tracks where it is running down the head,trans, etc. I sure hope it isn't coolant washing the grime off. I plan on degreasing the engine, and adding some dye to the oil. For the UV light.
I also realized the heater control doesn't seem to change much between def- floor-vent, not much fan pressure. But lots of noise. Time for some research.