Drained this morning and refiilled, repeat process a third time more gunk out but clearer.
After doing it 4 times, I came up with an idea combining the heater flush and radiator flush. Disconnected the heater return, but a hose on it going to a bucket. The connected the pump intake to a full bucket, kept the funnel on radiator and started engine. Then kept adding water from hose to funnel so it wouldn't go dry. The idea was to run water through system, flush out after heater. Seemed that it worked, 5 mins of running and rusty water became all clear.
Next was radiator drain and adding the Gunk super flush content. Then add water to fill it up, ran engine for 30 mins. The Gunk is soapy, must be the surfactants in the mix.
Let the engine cool for 20 mins, drain again. More dirt came out, which was good.
Afterwards, I reattached the short circuit on the heater and repeated that flush process again, until all was cl at water. Next, drain the radiator, close it up, and fill it up with Distilled water. I used 4 gallons of distilled to flush out tap water, same heater short circuit process., then drain radiator again.
Coolant adding. I added 1/2 gallon of direct coolant into heater hose, to make sure there are no air gaps there. There is at least 1 gallon of distilled water in system. Then I refilled radiator with another 1/2 gal of coolant, and 2 gallons of 50/50 mix. Using the heater cheat process, I was ale to ensure the water was expunged, pushed out by coolant. Then reconnected the heater return hose. Burp the system normally, and had 140F temp on the vents while running engine during burp process. All done, all mud and dirt out.
UPDATE: I checked the coolant today on 12/25 (dont have little kids, so time to tinker). Coolant looks perfect, like pinkish Koolaid, clean. Happy time.
