90 blower resistor blew up AGAIN

j fizz iin10ded at hotmail.com
Wed Dec 18 18:18:21 EST 2002


thanks much for the write up. i think my blower + heater core were replaced
a few years ago by the dealer.. i'm gonna do the resistor again and cross my
fingers. i can live with full blast. i really only ever use the cc when its
rainy out to keep the windows defogged. love that mild SF weather! =)


>From: "Bhatti, Mohammed" <Mohammed.Bhatti at si-intl.com>
>To: "'quattro at audifans.com '" <quattro at audifans.com>
>CC: "'human747 at attbi.com'" <human747 at attbi.com>, "'iin10ded at hotmail.com'"
><iin10ded at hotmail.com>
>Subject: Re: 90 blower resistor blew up AGAIN
>Date: Wed, 18 Dec 2002 08:37:15 -0500
>This question seems to come up often and I'm glad since it's one of the few
>things that I've BTDT and have some experience off.
>I have an 88 80q and it is a known issue with the early versions of the fan
>drawing more current than the resistor could handle.  Apparently it was
>fixed for late 89+ models.
>I have installed a used blower motor from a 1990 90 which lasted about 18
>months before the squirrel cage came loose.  I then replaced it with blower
>motor from a late 1987 80 and it's been in there for about 2 years on the
>same resistor.  So far, the resistor has not blown so I think I've been
>lucky in getting a blower motor that didn't have the problem.
>Anyway, it chirps a lot which I figure I can cure with some oil squirted
>into the blower motor.  BTW, it's not all that difficult
>the blower motor.  Removing the glove box is fairly straight forward.
>the second failure, I've just left it off.  Who needs a glove box anyway.
>The tricky part is removing the actual blower motor since there is very
>little room to manevur under the dash but can be done with some pushing and
>pulling on the dash.
>88 80q
> >>>>>>>>>>>>>>>>>>>>>>>>
> > i'm hoping for a little btdt: i replaced my blower resistor about 5
> > ago. it's recently gotten heavy useage as its been rainy and i need to
> > the ac on so the car doesnt fog up. last night the resistor died [hi
> > fan only]. that seems like an awfully short service life.. anyone know
> > any usual suspects before i start digging into it? any common upstream
> > problems that will cause this thing to break so quickly? the cars
>witing is
> > al stock but has no other glitches [knocking on audi-branded wood].
> >
> > or did i maybe get a bum resistor. the blower was replaced by dealer a
> > years ago [should be ok]..
>Hmmm... I was *going* to reply that the rumors I have heard are that the
>old fans chew up resistors and the new ones are better.  My fan has been
>chirping for years now in the winter and the resistor was bad when I got
>the car.  I am *not* looking forward to replacing the stupid fan, so I'm
>trying to make it until I need a heater core, too...
>At least the resistors are cheap (or *should* be - they are an old VW
>part, under $20 for mine)
>Maybe you got one of the "old" fans, I have no idea how to tell the
>I'd just replace the resistor pack and cross my fingers for now, if I
>were you.
>Huw Powell

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