David, I've been wotking with this lately.  That switch is called a trinary
switch. It can be purchased for $11  through Amazon. Same on EBAY.

JOHN

On Oct 8, 2016 17:16, "David Bjorkman" <ddbjorkman@verizon.net> wrote:

> I ran into a similar problem on my Rt 66/around the USA trip.  I am
> assuming that you speak about your radiator fan.  There is a pressure
> switch, can't remember the name of it, perhaps someone more knowledgeable
> can fill that in, behind the rear cabinet on the left that turns on the
> radiator fan to high when your AC is working really hard.  Sometimes that
> switch gets stuck in the on position.  If that is the case, every time you
> switch on the AC, your radiator fan will run at it's highest setting.
> I was lucky, mine unstuck and now works properly.  In my case, it may have
> been my addition of a couple of Pro Seal AC additives, which incidentally
> found and fixed the small leak in my system a couple of mechanics could not
> find. It just took operating it a few times and removing the fan fuse to
> stop the radiator fan until it worked properly.  Lots easier than removing
> the whole cabinet/closet to get at it,  Not sure the part is available
> through our vendors.
>
> Dave B.
>
> On 10/08/16, Larry Alofs<lalofs@GMAIL.COM> wrote:
>
> There seems to be a little confusion about whether this is related to the
> AC. The AC has a blower in the back. The front fan is for the fresh air
> and front heater.
> As Dennis said there could be various faults with the front fan circuit.
> I believe that you can swap the switches for the front fan and the rear
> heater fan which are near each other on the dash. This will help you
> verify or eliminate the switch as the problem.
> The resistor pack on the front fan can be reached by removing the
> dash...sorry. :-)
> With enough electronics skill and determination it may be possible to make
> an alternate resistor assembly and attach it near the switch. I have been
> considering this approach to solve the problem of no low speed on my fan.
>
> Larry A.
>
>
> On Fri, Oct 7, 2016 at 5:26 PM, kappycan . <kappycan@gmail.com> wrote:
>
> > I heard that i need some sort of rheostat; but cant seem to find anyone
> > with more information such as location etc............ anybody up on
> this??
> >
> > thanks, Keith
> > 89 westy in NL
> > that's Newfoundland, Canada
> >
> > --
> > "We shall not cease from exploration
> > And the end of all our exploring
> > Will be to arrive where we started
> > And know the place for the first time"
> > - T.S. Eliot
> >
>