Radiator flushing
You guess.
The system takes 14 quarts but you won't see that without removing the freeze plugs so when you add new coolant, mix it in a 30/70 measure by doing what I do.
I take an empty gallon jug that held distilled or 'bottled' water and mix the coolant/water in there. Just fill a third of the jug with anti-freeze, then fill with water. Distilled water if you're a fanatic (ahem). Shake it up a bit to mix it. Then pour the mix in the radiator, slowly. Do that until the radiator is full. I wait until all the air is out and I'm sure I have no leaks then I add the (expensive) Water Wetter. Works for me.
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