Clean radiator, cool engine, coolant PH, flow, fans, shrouds.

Distilled,does drop the PH,and electrolysis. All you listed,are the correct way.Nowadays,REAL radiator shops,are rare.Everyone ,throws water pumps,radiators,and band-aids now.Paying attention to the basics.Had a built 408.Ran the h/d brass 4 core Morons upgrade.Swapped in a Dorman electric fan setup,(2000 Ford Contour),engine break in hit,170 once.