Great idea.

If I remember correctly, it started out with a low resistance, jumped up to a
higher one then tapered off again as the wiper went to full open. I thought it
was odd that the closed and wide open readings were close.

Todd

Larry Alofs wrote:

> Todd Last wrote:
>
> > Thanks to all the list members who offered suggestions.
> >
> >  I think the main culprit is the AFM. I checked with a multimeter and it
> > had a non-linear response.
> >
>
> Your diagnosis and fix may be correct, but you should be cautious about
> interpreting resistance measurements from a multimeter in this case. Bentley
> says only that the resistance should "vary" as you move the vane.  They are
> purposely vague about *how* it should vary.   The rather unusual
> construction of the AFM means that the resistance measurement does not vary
> in the way you would expect for a typical potentiometer or rheostat.  A
> better testing method is to connect a 1.5 V cell across the two end
> terminals and watch the voltage at the terminal connected to the slider
> while you move the vane.  Of course behavior on the workbench may not be the
> same as that in the car, vibrating, etc.
>   You may still want to try the "capacitor fix", or the official VW remedy
> ($$).
>
> Larry A.
> Chicago
> 91 GL  (Still not sure that my capacitor will fix it!)