Okay, I have one good heater cable and one good flapper valve, both on
the right side of my 82 aircooled van. I'll be scrubbing the boneyards
for the missing parts, but in the meantime I'll be wanting some heat.

As luck would have it, I live in So. Cal., so I don't need a lot of
heat, but I need some to the defroster and some just because I'm
getting old.

Somehow I have to cap off the heater ducting in front of where the
left bellows would attach because I haven't got a flapper over there.
That's trivial.

The non-trivial part of this work around is that I need to block some
of the air going from the alternator-mounted fan over to the left heat
exchanger.

- I don't want to block all of it, because that would lower the
effectiveness of the working exchanger, on the right, because all the
air from the fan would be passing over it.

- I don't want to spill all the air, because that would lower the flow
through the right half of the system too much.

So: how much should I block? And any good ideas about how to do it?
some kind of a baffle?

Thanks,

Mark