Coolant System Flush

To truly drain the whole system you need to remove the drain plugs on the sides of the block "near freeze plugs". I've read arguments for draining/flushing all the coolant once per year, or you could just remove upper and lower radiator hoses and let coolant drain. Refill system with your 50/50 mix. And you have yourself what most "stealerships" call a coolant flush and fill. As far as flushing the system water works as well as anything sold.

Flushing the cooling system, I use distilled water.

Drain coolant. Fill with DISTILLED water. Run engine with heater on HI until engine reaches operating temp. Let engine cool. Drain coolant.

Repeat 2-3x.

Engine flushed.

Fill with 1/2 the listed volume of coolant (100% antifreeze) in the manual (eg, if the manual says 7.5L of coolant capacity, fill with 3.75L of 100% coolant). Top off with distilled water (this gives you a 50:50 mix).

SGaynor said:

Drain coolant. Fill with DISTILLED water. Run engine with heater on HI until engine reaches operating temp. Let engine cool. Drain coolant.

Repeat 2-3x.

Engine flushed.

Fill with 1/2 the listed volume of coolant (100% antifreeze) in the manual (eg, if the manual says 7.5L of coolant capacity, fill with 3.75L of 100% coolant). Top off with distilled water (this gives you a 50:50 mix).

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I made up a radiator drain plug to garden hose connection, using a piece of clear tubing.
That way I could see what was running out.

And of course just let the coolant drain into the street.
/sarc