[T3] FI cyl head temp sensors

[Jim Adney <jadney@vwtype3.org>]

I promised Mike I'd find him a better temp sensor to try, so sunday I gathered 
together all the ones I could find and measured them. I had never done this 
systematically before; I simply assumed that they were fine as long as they 
were neither shorted nor open. I was surprised at what I found.

I find that I seem to have temp sensors that are of 3 distince resistance 
ranges:

700-1000 Ohms
2200-2500 Ohms
~3000 Ohms

The literature says that they should measure 2000-3000 Ohms at 68F, so 
the last 2 groups probably fit in here okay. I did these measurements in my 
basement which probably just about that temp right now.

Russ, do you remember how many Ohms the little add-on resistor was that 
you could add in-line to the standard part?

I also looked at the part #s stamped on each sensor. In most cases I was 
able to read enough to verify that these were really the right sensors for our 
cars, but the numbers (Bosch & VW) don't seem to match up quite right.

Mike, I'll get an assortment of parts mailed out to you tomorrow.

-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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