[pairodice]

Thanks for the advice guys! I will drain the system into a kiddie pool then transfer to 5-gallon buckets; flush the system with distilled water, drain into a kiddie pool and transfer to 5-gallons buckets; then fill with new antifreeze;
Thanks for the ideas about the kiddie pool and transfer pump! I found a pump at Harbor Freight that I hope has enough head on it to pump up 7’ or so to the tank fill…
https://www.harborfreight.com/110-gph-su...70487.html