This is more of an update on the coolant issue. To recap, drained the system, flushed with distilled water and finally refilled. Had problems with that, even bought a vacuum pump to make it happen. Finally discovered the problem. Reservoir tank leaks. Very tiny drip, but enough to mess it up. Cannot really see from where (not hoses). Will remove it, see if repairable or buy a new one. It's always the little things that mess up a project.