Coolant flush or refill?

[dr. d]

Ako usually drain lang from radiator plug then flush with water. Pag clear na, refill it with ready to use prestone coolant.

dad used to place a garden hose into the radiator's filler neck, back when radiators had open-able filler necks, open the radiator drain, and run the engine at idle until the draining water is clean and clear. it took only a few minutes.