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Originally Posted by miner
As far as I can tell, this procedure allows you to flush the entire coolant system (heater core and lines, engine block, and radiator) and you don't need to remove the rusty drain bolt.
I ceratinly could be missing something, though. If you think I am let me know so I can fix it tomorrow.
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DD is correct.
You can add flush water from the top all you wish and the lowest point in the system where it can exit is the thermostat housing. All the coolant in the block remains below this point. It's not a very good design and it requires you to remove the block plug if you wish to get the last three quarts of coolant out of the system.