Date: Fri, 3 Feb 2006 14:51:38 -0500
Reply-To: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Subject: Re: running hot....any ideas?
In-Reply-To: <6da579340602031125h7ab147b0w41e9b00ecfb00851@mail.gmail.com>
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very cool and thanks for posting. i have a question then a
comment. what is a decade box? two things seem odd here first is that
the vw tool wouldn't test the middle value only the upper and lower
bounds. second it seems odd that with 35 ohms that its reading "hot", i
guess one has to qualify what "hot" means is that the last little white
bar or is that the gage all the way pegged. if the gage is pegged that
seems weird as that is what it does when you ground the lead.
when i swapped the temp gage in my cluster i sort of remember there being
numbers printed on it but once installed in the cluster you couldn't
observe the numbers. if there were numbers i wrote them down for further
reference in the future although they would be in piles of paper that
aren't easily accessed at this point :(.
i think i shall call my local dealer and see if they have this tool they
do vw, porsche and audi and have some older guys so i might get lucky.
for the sake of discussion does anyone out there have information that
suggests what temperature values the different lines on the temp gage
equate to?
jonathan
On Fri, 3 Feb 2006, John Bange wrote:
>>
>> the real solution to all of this is to either find a dealer that has the
>> vw special tool and actually knows how to use it. or to figure out how
>> the tool works ie what resistance equals what position on the gauge, and
>> or what resistance equal what temperature.
>
>
> I did a little archive dredging a few months back on the subject of the
> VW1301 tool and came up with the following:
>
> VW1301 is apparently a variable resistor device on a 12V input. There are a
> few mentions of it in the archives. Ken Lewis did a test with a decade
> resistance box and came up with some numbers, but I think he had the "fuel
> full" and "fuel empty" numbers reversed. The markings on the VW tool are a
> German engineering mystery. The proportion seems to be 5:3 in terms of
> "VW1301 number" : "resistance in ohms". Ken himself even mentioned the
> 3/5ths thing at the time.
>
> What it comes down to is: ("tool" means VW1301 tester dial setting)
>
> tool = 50 ----- 35ohms (tank reads full, temp reads hot)
> tool = 320 ---- 210ohms (tank reads empty)
> tool = 510 ---- 340ohms (temp gauge reads cold)
>
>
> --
> John Bange
> '90 Vanagon - "Geldsauger"
>
>
>
