Loosing a lot of coolant
it has to be either leaking somewhere, or it is going through the engine-check passenger floor for heater core leak, or a hose/clamp leak near or over the exhaust. Is the system holding pressure when hot? {squeeze the upper radiator hose when hot, you should feel it as a solid hose, that is not collapsed}. If you have pressure, it is some sort of external leak if you do not see smoke coming out the exhaust.
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