Hear is my scenario that I am looking for some feedback from the wise  list
gurus: My 1990 Westfalia suddenly started running extremely rich/losing
power/stalling when it reached the peak operating temperature (about 1/2 up  on the
temperature gauge). I decided to replace the temp II sending unit since  it
was much older than the O2 sensor; the airflow meter checked out and in  general
the nature of the symptoms. Now the problem no longer exists but my
operating temperature according to the gauge is much lower. I ran the part #  from my
sensor that I got at the dealership through the search by part # locator  on
the Bus Depot site (very useful tool-Thanks Ron). It checks out and is blue  in
color-all seemingly correct. My old temp II sensor that I removed looks
exactly like the coolant temperature sending unit pictured on this page of the
Bus Depot site _http://www.busdepot.com/details.jsp?partnumber=251919501D_
(http://www.busdepot.com/details.jsp?partnumber=251919501D) .  So my theory is that
the last shop that replaced this particular temp II sensor  installed a
coolant temperature sending unit by mistake. Does anyone concur or  disagree with
this theory? Might I also have a problem with my thermostat  sticking open that
causes my temperature to now appear to run so cool? Does  anyone know how the
electrical values of these two sending units compare? Just  to rule out one
other possibility; I did replace the correct sensor per the  diagram in Bentley
that was double checked with the Digifant manual and Alldata.  I also
verified that the wiring terminated at the correct ECU pins at the  computer. Wiring
is all in tact and connections are all clean. Any help from the  list would
validate my hunch that my Vanagon mind has not jumped the track and  permanently
derailed from the fuel line job fumes from earlier this summer. Man  I hate
that kind of dain brammage!  Thanks everybody!

David Clarkson
90 Westy (246k)

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