Should I fill and flush in between?
The car current has the wrong coolant in it (the green stuff!). I'd like to be sure to get as much of the old coolant out of the car as possible.
Would it be OK to drain from the radiator and left drain plug, then refill the cooling system with just water, run until warm, and then drain it again, refilling with the proper coolant / water mix? I'm not sure if running just water for 5 minutes would be bad for the engine.