Electric fan.
#2
Do either of the fans come on? What are you using to trigger the fans?
The signal for the AUX fan is WAY too high to use as the primary fan.. I'd use an adjustable temp switch for the fan..
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#10
It will always spin a little.. When the VC locks up, the fan will noticeably speed up..
you could also feel the ratiator for cold spots, feel the hoses on the inlet and outlet side... does sound like a fan problem. At speeds over say, 40, does the temp drop as well?