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That’s a lot of water to lose. If it were a head gasket that had failed I would expect the engine to be running roughly, a spark plug to be showing evidence of water contamination, and coolant in the oil. If its running normally and there’s no sign of coolant in the oil than its fair to assume the mechanic was correct and its not a head gasket. Falcons of that vintage are renowned for failing the transmission oil cooler, which is in the radiator, and if that happened coolant leaks into the auto trans. Also check for external leaks, damage to the radiator etc.
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