This is why I keep my Vanagon.  First forget the O-ring.
Take it apart clean, and use sylicone seal. Will never leak
again.  The rear blower almost never goes bad.  Yours
has obviuosly been abused.  Did you have the cover on
the entire unit?  Take it apart and clean everything.  Lube
and you should be back in busness.  If it is really
dead, I have several working rear blower, you can
have cheap.   As for the hear core.  You will have
to spend money here.  These are a known problem.
http://importedcarparts.com/     is the best I've found
price wise...
                                         Eric

J. Harvey wrote:

> I discovered my rear heater valve leaks at the seal if you wiggle the
> connected hose.  So, should I replace the whole valve or just the O-ring?
> Who should I buy from?  The archives suggest the dealer charges ~$45
> for the
> valve and ~$3 for the O-ring.
>
> The blower won't turn and eats fuses.  It was seized up but I got it to
> rotate  by hand.  It's still not wanting to trun freely and ate another
> fuse.  Can I save it or do I need a new one?  Who should I buy from?
>
> I suspect the heater core is junk too.  I've heard $55 new at Halsey in
> Portland.  Can anyone beat that?
>
> If this repair is going to cost $180 I might just bypass it.
>
> Thanks, John
>
>
>
>
>
> '85 Silver Sunroof
> '91 GTi 2.0 8v
> '76 BMW 2002
>
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>