The AAR lets air into the air distribution box when it's cold and no air
into the air distribution box when it's warm.  So, let it get down to
"cool" (maybe around 50-60 degrees) and you should be able to blow
through it easily.  Warm it up to "hot" and you should not be able to
blow through it.  Sounds like yours is working OK.

When you did your test and it didn't work as expected, it may have been
because of

   1) You waited too long and the AAR was already
      warmed up (and closed), or

   2) you didn't pinch the hose hard enough to close
      it down completely.

On Thu, 24 Jun 1999, Karl Wolz wrote:

> I am questioning whether my auxiliary air regulator (AAR) is working
> properly.  Benley's only advice is to squeeze the hose shut when the
> engine is cold and observe a drop in RPMs.  I've done that, and there
> was no drop.
>
> My observations:  when I pulled it from the warm engine it was closed,
> and after cooling to room temp it was partially open, and after an hour
> in the freezer, it was closed.
>
> The service tech at my friendly? local VW dealer says there no way to
> test the AAR when out of the vehicle.  I figure you have to be able to
> measure resistance vs. temp, or something along that order.  I bought a
> new one and it seems to behave the same as the one I pulled.

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Tom Young               young@sherlock.SIMS.Berkeley.EDU
Lafayette, CA  94549    '81 Vanagon
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