JFP is right. I did the burping technique but have only managed to get 4 gallons into the system leaving me to believe there may be air still in the system. I am fairly certain I completely drained the system but likely did not since the amount captured when draining was between 4 and 5 gallons. I replaced the lower radiator hoses and installed a new low temp thermostat. Thought all fluid was out but perhaps not.
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