
Originally Posted by
Harold14370
If I understand you correctly, you have some kind of heat source at the bottom of the system and a cooler or radiator of some kind at the top. (It won't work with the hot part at the top.) In between, in the hot leg or the cold leg, you have a trap, which is partly full of air, partly with fluid.
That could work, but any kind of loops in the pipe like that would make it harder to get the siphon started. Also, you would have to make sure that when you vent the trap, you are not letting air in. That would break the siphon.