Memphis,
Now a few things are making sense. I bet that tiny flakes of oxide are partially plugging the cap tube. No big deal - just braze with an inert gas.
The funny thing with small particles in the system, is that the set up will not work predictably. Sometimes all is fine and then a bit of oxide flake gets in there. Because of the tiny tube diameter a smaller flake can restrict flow. It only takes an 11% change in tube diameter to decrease flow by 50%.
PLEASE do not get discouraged. This is great stuff!
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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