Robert,

The low speed fan circuit passes current through a heavy-duty ceramic
resistor.  On my '91 GL this resistor had burnt out and the results were
very similar to the problem you describe.  

Try checking this first.  It's a large greenish-white ceramic tube that
is located behind the driver side headlight.  If you have AC, you may
notice that the low-speed fan doesn't work for that either.  This would
be a symptom of the same part.

wade

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Robert Steven Fish
Sent: Saturday, May 04, 2002 3:48 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Help - Low Speed Radiator Fan Dead... High Speed Works..!?!?!

Hi again,

I have been playing around in the coolant zone now for a few days... I
have all the major coolant lines replaced, and just started her up
tonight.

I had been wondering if I should create a nice manual fan switch, based
on all the talk on the list, as well as the fact that I was not certain
that my temp switch at the radiator was working....

tonight while bleeding the system, and letting her idle at 2000rpm for a
long time, I had the pleasure of hearing the high speed fan go on by
herself!!!  Yes, it does sound like  an airplane engine..... no, I did
not get any low speed before hand.... that concerns me.

My question to the list:

Is it possible for the temp switch to be defective and only be broken
regarding the low speed, and be functional for the high speed????

I will be taking another look tomorrow, and will be looking into a 2
speed manual cockpit switch, with a timer on it, so I can run my fan
after I leave the car, and it will automatically shut off after 10
min... or something.

Anyway...  please give me some feedback.  My guess is that I should
replace the switch on the radiator anyway... and in addition make my
parallel timer manual 2-speed cockpit switch.

Thanks!

RSF

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Robert S. Fish
Salzburg, Austria
1987 Wolfsburg Vanagon 2.1 GL Weekender
1987 Golf Cabriolet
1991 Golf