Quote:
Originally Posted by Comanchecreek
The idea of the antifreeze is to displace any water in the lines. No reason to leave it under pressure, and as long as you have adequately pumped it through the system, you can open all of the drains and faucets and let it drain out. You don't need to keep the system "full". That will not add any protection, although it probably doesn't hurt anything. Most freeze damage occurs at fittings which can't take the expansion of freezing water. As long as the antifreeze has passed through, you won't have an issue.
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Would it be possible for condensation to pool in low points and cause an issue? Note: I have never even added or flushed with antifreeze, I just blow out with air, close all the faucets and leave low point drains open. I'm in western Oregon though and might see 20F once a winter. I've never had an issue, but with winter humidity above 90% where I live...just wondering.