My auxiliary cooling fan that comes on when idleing isn't working on my '88 4.0...What's the best way to locate the problem?...as always..Thanks..

 

testing procedure herehttp://www.lunghd.com/Tech_Articles/..._Diagnosis.htm

 

Thanks. The test results tell me to replace the "fan diode assembly". To me, a schematic might as well be in Chinese. I'm good with pictures but I can't find a picture of what it looks like...The folks at Auto Zone say they've never heard of one. Your help is appreciated.