After my initial run yesterday morning the coolant 'low' light came on..and I topped it up after a couple of hours of cooldown. This am the light was on again and it only needed a small amount of coolant to have the light go off.The light most likely would have gone off on its own at this point after expansion during warmup.
When I redrained the system, I drained via the rad plug.On fillup I added the coolant slowly.