Water Pump Failure Process

[Calmg0d]

Well, I spoke too soon it appears. I posted earlier about the waterpump/thermostat replacement and all of it going very well; until today. I had thought I bled the system the way it was intended as yesterday and this am the needle was solid steady between the 1 & 8 in 180. Then at 1230 today driving back from lunch the car goes up to the far side of the 0. Checked the coolant and all was in the allowable ranges but after sitting for 4 hours I was about 3/4 of a gallon low. The gauge went back to normal for a bit and then it won't stop climbing now.

Did I not bleed it enough? I've been reading as much as I possibly can to see if I need to keep bleeding and I've found very little. Some say one and done; others say run with bleeder valve open for 3 days or more.

Can any of you chime in here?
Thanks for any help as you guys & girls have some phenomenal advice.
Cheers.