I believe I will just keep running distilled water through it to flush it out, esp since I have a new radiator.
I have not had a problem with getting heat in the truck, nor has the coolant been exposed to freezing temperatures here in SWFL, maybe mid-30's, and that's only a few nights per year.
I have noticed that I have no airflow in my far right passenger side dash vent, and that the little damper knobs have no effect on air flow in ANY of my dash vents. That has been an issue since I've had the truck, I have no desire to take the dash apart unless I absolutely have to.
I am hopeful that I can get most of the crud out of the system. I might do something with the old radiator to see if any grit is in there.
I am not fast, and it most likely will be Saturday before I can continue, so stay tuned....