Seems to me the best way to fill a cooling system or purge a "full" one would be to pull a vacuum. All the air would expand out leaving only water. Never tried it or seen it mentioned. Turns out Sears (and many others I'm sure) sell a kit for just that:
http://www.sears.com/u-view-ai...ockNo=3&blockType=G3
Anybody tried using a vacuum?
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