From: peter.hertler@rose.com (peter hertler)
Subject: Fan [heater blower]
Organization: Rose Media Inc, Toronto, Ontario.
Date: Mon, 14 Dec 1992 21:37:02 GMT
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Date Entered: 12-14-92 16:35

K >From: keys@starchild.ncsl.nist.gov (Lawrence B. Keys)
K >Newsgroups: rec.autos.vw
K >Subject: Re: Fan [heater blower] runs only at high speed -- 1988 Jetta
K >Message-ID: <7289@dove.nist.gov>
K >X-Gated-By: Usenet <==> RoseMail Gateway (v1.70)
K >Date: 4 Dec 92 20:25:18 GMT
K >References: <JPT.92Dec4090448@telecaster.think.com>
K >Sender: news@dove.nist.gov
K >Organization: National Institute of Standards & Technology
K >Lines: 34
K >
K >In article <JPT.92Dec4090448@telecaster.think.com> jpt@telecaster.think.com (James P. Taylor) writes:
K >>
K >>The heater fan only runs at high speed on my 1988 Jetta.  
K >>
K >>I recall from another experience with a VW product that there is a resitor
K >>pad somewhere that drops the voltage to the fan motor.  Depending on which
K >>speed postion you have you go to a different tap on the pad.  When you are
K >>at high speed you bypass the resistor pad.  There was a thermal diode on
K >>this pad and it fried.
K >>
K >>Is there a similar arrangment on the Jetta?  Even if so, and if not, what
K >>should I be looking for?
K >
K >If i remember correctly there is a panel attached to the blower motor
K >which houses the thermal diode.  The blower motor is located behind the
K >glove box, again, if i remember correctly.
K >
K >
K >>
K >>jim taylor Thinking Machines Corp Cambridge MA
K >
K >                                                   .              
K >                                                 /                
K >Larry                            __/    ______ /                  
K >keys@csmes.ncsl.nist.gov       /                \                 
K >                         _ _ _      __      _____  \------- ===   
K >            ---------- /  __ /    /  /    /__  __/            \   
K >         /            /  / ____  /  /       / /                |  
K >        |            / /___/  / /  /__   __/ /__              /   
K >        /_____       \______/  /_____ / /______/        --- ////   
K >             \_____           2 liter 16v       \_______/         
K >                                                                              
K >        Fahrvergnugen forever!
K >
K >
Jim, 

I had a similar problem with my 86 Turbo Diesel Jetta with Air. 

I found that after replacing the $60 resistor pack 3 times in as
many years, that, the thermal diode was defective. I cut off the
old one and replaced it with a new one from Radio Shack for $2. 

I used spade connectors to reconnect the new diode to the resistor
pack. You can't solder it, because, the solder will melt once
its in front of the heater. 

Its been running for about a year, with no more problems. 

I also preformed this mod on two other Jetta's, one 85 gas with air
and a 87 diesel no turbo with no air. All of them work fine. 
 

You will find the resistor pack behind the glove box with the aircon.
models and I believe the non air model has the resistor pack
by the feet of the passenger on the side wall in front of the door,
but I'm not sure on this one. 

Send me a note if you need more info. 
 
Peter Hertler 

PETER.HERTLER@ROSE.COM
PETER@VNET.IBM.COM 
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