Date:         Tue, 9 Aug 2005 07:57:47 -0500
Reply-To:     Max Wellhouse <maxjoyce@IPA.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Max Wellhouse <maxjoyce@IPA.NET>
Subject:      2.1 Temp sender resistance values?
Content-Type: text/plain; charset="us-ascii"; format=flowed

  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