Well, my squeak must be in the other bearing.  ('86 woflsburg)  One
thing I have noted is that my fan motor shaft looks a little
different from the photos I've seen.  Most just look like the end of
a shaft sticking out of the bearing about 1/4".  Mine seems to be
longer and has something on it like a washer or large diameter
cap.  It has the appearance of a tiny pulley.  It looks like maybe
3/4" in diameter.  Looking at the edge of this thing, it looks like
the center is a different material than the edges.  Maybe there's
already an aftermarket motor in there?

Anyway, with an LED headlight worked into the air inlet, I could get
good light on the bearing and see it fine through the 5/8" hole I
drilled.  The trick is both seeing through the hole and getting the
lube tube in there.  I used the very thin tube from the tri-flow
bottle and stuck that into the more typical size straw that comes on
many spray cans.  I first enlarged the opening of the larger straw
with a tiny drill bit.  First tried tri-flow.  not much change.  Then
tried PB blaster as Mr Mullendore himself used.  not much
change.  then I tried some WD-40 with just the one large straw on the
can.  Less pinpoint accuracy there.  A few shots missed but then I
hit the bearing dead on with 2 or 3 short bursts.  I could hear the
motor speed up, but not much change in the squeak.  One more blast
with motor off and let it soak a few hours.  Came back to test....not
much change.  Then back to tri-flow.  Used both tubes and got it dead
on the spot with the motor off.  Turned it on for just an instant a
few times to barely spin the motor, then let it soak.  Test the next
morning, squeak is still there.  The squeak is most evident at the
lowest turning speed, like when the motor is starting up or slowing
to a stop from speed 1.  No squeak on speed 2 or 3.  So I guess I'll
live with it until I pull the dash and do the whole heater system rehab.

Edward