[T3] T3 Thermoswitch testing

[Will McCreight <whmcc@attglobal.net>]

<x-flowed>Am in process  of treating a sick 1970 squareback, and while testing the 
thermoswitch which activates the cold start injector under cold 
conditions during starting, I thought I had a bad thermoswitch, based 
upon an "open" or infinite ohms reading at room temp when testing  
between the lead connector and the body of the sensor.

After reading many posts here on vwtype3.org (thanx to all of you for 
feeding my brain), the thought struck me that instead of heating this 
sensor, I should put it in the FREEZER!

Sure enough, when I test it right out of the freezer, it reads about 1.1 
to 2.0 ohms, and then rapidly warms enough to go to infinite ohms, 
"opening" the connection.

I think this is proper behavior for this sensor, based upon its purpose, 
to allow current flow at cold temps but not warm, but I would appreciate 
confirmation of this, as I am a "newbie".

I went to a shop today to replace the sensor, thinking it faulty at room 
temp, only to find that the shop owner thought his sensor was bad 
also...based upon our shared faulty logic (I now think in retrospect) 
that we should be able to measure some level of ohms resistance at room 
temp with this sensor, rather than an "open".  Before I tell this 
skilled and experienced VW-only shop owner about my thoughts on this, 
I'd appreciate your thoughts also.

Will McCreight

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