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JamJanTan, I stand corrected. You got my curiosity going. I couldn't imagine you had an extra valve and I didn't.
I got back under the shower again and lifted the heat duct and there buried beneath the subfloor was a third valve. It was on a blue line. I turned my pump on, all was still pressurized, and when I opened the valve, the pump kicked on. I went outside and looked under, guess what. A mixture of antifreeze and water was running on the ground as in light pink. Which tells me that it is a low point line that had some water left in it, but from where. The rest of my lines run pure antifreeze.
Since it is sandwiched between the floor and the subfloor, the only thing I can see is that it appears to terminate at that valve. It looks like it runs from the bath area, but it could have an "L" in it where it can't be seen. It's a mystery.
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