Date:         Tue, 9 Aug 2005 06:36:00 -0700
Reply-To:     Michael Snow <mwsnow@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Snow <mwsnow@GMAIL.COM>
Subject:      Re: 2.1 Temp sender resistance values?
Comments: cc: Max Wellhouse <maxjoyce@IPA.NET>
In-Reply-To:  <6.2.3.4.2.20050809074120.027ca440@pop.ipa.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I recently replaced my Temp 2 sender.  The one I removed appeared to
have been installed at the factory, and was rated 12V @ 120C.  The
replacement part had the same VW part number on it and was rated at 12V
@ 125C.

Michael Snow
1987 Syncro GL camper
1986 GL
1982 Westfalia 1.9D

Max Wellhouse wrote:
>  A crazy  idea popped into my head and I need some feedback from the
> electrical gurus on the list.  It concerns a couple questions about
> the stock temp sender on the thermostat housing.
>
> 1. Are the resistance values the same for both temp 1 and temp II senders?
> 2.  Are the resistance values the same as the VDO 150C after-market
> temp sender?
> If not, is there a resistor I could put in line that would get them to
> match?
> 3.  Do both of the temp senders in the T-stat housing actually
> measure the coolant temperature on the closed side of the thermostat
> before it gets to the the pipes leading to the radiator or do they
> only  being to show a reading once the thermostat starts to open up?
>
> My questions relate to the fact that if the resistance values are the
> same(ie. the dash gauge is also a 150C gauge like the VDO aftermarket
> ones) then what would stop an enterprising Vanagon owner from tapping
> off that signal as opposed to adding a separate sending unit in the
> coolant line somewhere?
>
> Thanks for the help
>
> Max
>