There are more experienced air cooled people here than me. With that
said and if I'm not misunderstanding your intentions....

Blocking any air flow at alternator fan or elsewhere in the engine air
cooling system is a bad idea. And, having one heat exchanger flap open
to bring hot air to cabin, and blocking the other, may cause an
cooling imbalance in engine cooling system. Maybe.

You may find there's enough heat in cabin by leaving both heat
exchanger flaps open.

Neil.

On Mon, Dec 27, 2010 at 11:54 AM, Mark L. Hineline
<hineline@ocotillofield.net> wrote:

> Okay, I have one good heater cable and one good flapper valve, both on
> the right side of my 82 aircooled van.
>
> 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.

--
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines