Some new info to add to help diagnose this. I wanted to run another uview combustion gas test, so with the rad cap off, I started the car to warm it up good first. Fluid kept rising up the filler, so I suctioned some out. Iíd give it a little throttle occasionally to help speed the warm up. I want to get it warm enough so the t-stat opens. I have to constantly remove rising fluid. Dash gauge finally shows normal, but t-stat remains closed. I ended up sucking out about 8 cups of coolant before i noticed coolant finally flowing, but it was still rising. I finally shut it off and the coolant immediately dropped. Literally instantly. Like whoosh the rad fill is empty. I filled it back up. It only took about 4 cups to fill. Iím going to take it for a short drive, let it cool down and check level again. Obviously it will be low again when I check it cool. This almost sounds like a stuck closed t-stat except the car doesnít overheat. Iím stuck. Any ideaís.
Oh, i did run the test again and the result was negative for combustion gasses. It does spit a bit of condensation from the exhaust, but from what i read that is pretty common.
edited to add
I did another couple hot/cool cycles yesterday. Each time it would take a little more coolant. This morning I checked and the rad was full and had sucked some coolant out of the overflow. Iím off today so will take it for a couple of hard drives.