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During the course of the model year, two different factory hot air heater
systems were used in the Lincoln-Zephyr.
The first two shots are of a NOS heat exchange unit used in
1936 and early 1937 cars with a center-exit exhaust manifold on the passenger side. (This is about as rare
as a part can get. Many thanks to Mike Lewis of North Pole, Alaska for sharing these.)
The later pictures show a complete system from a parts car that was
made relatively late in the production run (HB39824). In this case, the main heat exchange element hooks up to a front-exit
passenger-side exhaust manifold. This latter setup was used at least through 1938.
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Below is a passenger side view and a front view of the
1936 - early-1937 heat exchange unit. The long front pipe joined up to another pipe that led to the passenger-side
exhaust manifold. The two openings on top provided connections for the fresh air inlet and hot air outlet pipes (you
can see these pipes on the "detail pics" web page).
As configured, this unit would have sat behind
the engine, under the passenger seat. It is also a fairly complex unit, especially when compared to the later style,
and required long inlet and outlet pipes. Finally, the fact that the unit was further away from the engine and
heated air had to travel a greater distance probably made this unit less efficient as well.
The remaining pictures below are of the later-style heater system.
The first one shows it as it was installed in the parts car
Here is the entire engine bay system removed and laid out on the ground.
Notice that the heat exchange unit attached directly to the passenger-side exhaust manifold; odds are, it received alot
more heat than the earlier unit.
Looking down into the heat exchange unit, you can see the baffles going
around the exhaust pipe. These baffles radiate heat to the air being blown around the outside of the pipe.
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