Instead of draining everything prior to adding antifreeze to the system, just drain the water heater, switch the valves into the correct positions, and then with water in the lines, start the siphoning process and you will not be sucking air, but will have water at the pump to actually be pumping antifreeze through the system.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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