The hot water return was via a fitting in the radiator-to engine-block lower gooseneck just below the water jacket on the front driver's side of the block. I have one I could photo for you if needed.
A very fine hot air heater was also available, manufactured by Kelch.
PS - notice the diagram of a hot water heater installed on a 1933 Packard, this from my article on the Kelch heaters.
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