Got it!!!
That awesome SureFlow diaphragm pump I thought I ruined by running on 5v works fine. My coolant just happened to be freezing up at the same time my pump "died", so it seemed to not be working right even on 12v...it was shutting down.
Anyways...I removed 3 gallons washer fluid and added 3 gallons pure Prestone antifreeze. I don't think it will be freezing up anymore. I saw the bath temp was down to -37c last time I chilled it, and it is better insulated now. I took care of the cold piping so it should be colder yet.
I would say 3rd time is a charm, but I tried 2 different pumps yesterday so I'm on the 4th attempt.
This pump will pump air, it doesn't care...it's bad-ass. Not even the slightest bit of hesitation.
Diaphragm pump is the key.
I'm expecting to see all zeros on the cpu and cores today, instead of just the cores.
I psyched to fire it up after I shower and eat.
Happy Sunday everyone.