[s-cars] HVAC blower fan

[Charlie Smith]

Earlier, Chris Tucker wrote:
>
> Hello all,
>
> I am looking for some emails posted a while back regarding a
> refurbishing of the bearings in the HVAC blower fan.  I've gone
> through the yahoo archives and could not find post I was looking
> for.  I've seen the tech article on UrS4 on the bower fan motor
> replacement, but was hoping for a simpler fix.  If anyone knows
> of the post, please send it my way.
>
> My blower fan in my 94 100 quattro needs a good door slam to start
> it spinning.  Once it's going, it runs fine and does not make any
> chirping noise or squeaks.  I was hoping a good refurbishing of the
> bearings would be enough to get rid of the resistance causing the
> fan not to start.

My experience with examining just-replaced blower fans, is that
the brushes are so worn they don't always press on the commutator.

The reason the 'good slam' works, is the shock makes the brushes
maybe just touch the commutator once again.  When the brushes get
worn to the limit, their spring frequently is now pushing against
the brush holder and not able to put pressure on the brush.

I'll bet with a little work, you can find or make replacement brushes
and put that blower fan back into operation.  I'd lube the bearings with
some oil that won't drip / fly off onto other places like the just
replaced brushes.

Once you get it apart, see if you can find brushes that have similar
lead wires, even if the brushes are too large.  You'd be suprised
how easy it to file the sides of the new brushes to size them to fit.

>
> I don't receive the messages from this list so could you please
> respond directly to me at S4 at quat.com

Shame on you!  You'll miss half the fun  :-/

    - Charlie


  Charlie Smith   charlie at elektro.cmhnet.org  614-471-1418
  http://www.elektro.com/~charlie      Columbus Ohio   USA
  http://www.elektro.com/~audi     photos & technical info

  95 S6 Quattro  -  24 PSI, RS2 6 speed, and other features
  97 Dodge Ram   -  35 PSI, 4x4 w/Cummins turbo diesel