Don't count out the possibility of switch failure.  I'm in the middle of
the same procedure, only I discovered that my switch was bad *AND*
the motor is bad.  It wasn't too hard to take a apart the switch and sand
down the small metal pieces that had been corroded and test with
a meter.  After fixing the switch, only speed 3 did anything, but what it
did do was force the motor to spin momentarily and then start things
smoking!  Felt like bad bearings to me....

Jim
'90 MV

John McLean wrote:

> I just changed out my rear heater core this weekend.   After the the
> re-installation I now only have the high (3rd) fan speed.
> The low and medium settings no longer function.  All three speeds worked
> before!
> My leak is fixed now but I have a new aggravation.  I took the shroud
> back off and disconnected and reconnected the wiring thinking there
> might have been a bad connection but nothing changed.
> While I had everything apart I blew it all down with an air hose but
> everything was solid and nothing seemed to be wagging or flapping.
> I can't believe the problem could spontaneously occur at the switch on
> the dash and there is only one fuse that controls the blower (right?) so
> the problem must be at the motor itself.
> Anyone got any insight on how to approach this?   I could live with just
> one rear blower speed (high) but I don't want to!
>
> Thanks,
>           John McLean   87  Vanagon  GL

--
Jim Wheaton * e-mail: jim@musclefish.com * http://www.musclefish.com
Muscle Fish / Audible Magic * 2550 Ninth St., 207B * Berkeley, CA 94710
Berkeley: (510) 486-0141 * Home Office:  (415) 485-5242