Winterization Question, leave AF pressure in lines?

[RichKitt]

To all:

A quick question regarding winterization. I have blown out my lines with air and added antifreeze. Do I leave the antifreeze filled lines filled under pressure or open a set of faucet handles to relieve the pressure for the winter?

Thanks

[ARoamer]

You should be good either way. FWIW, I let the pressure off and lightly close the faucets.

[Jagiven]

Either is fine. I'm the belt and suspenders type. I blow the antifreeze back out, and down the traps and into the waste tanks. I figure my P-traps are my weak link and this give me the best opportunity to dilute any water that is mixed in with the antifreeze.

[Nature Ist]

In the northern climates especially, the recommendation is to always relieve the pressure from the lines and leave at least a couple of valves open partially or all the way. Though antifreeze should prevent a solid freeze, it will start to get slushy when below freezing and will expand as that progresses with colder temperatures. Add into that equation that you never know for sure you have removed all of the water from your lines by blowing them out.
Even in cars and trucks, there is room for expansion and contraction of coolant.

[RichKitt]

Thanks guys!