lugnut

Neither have i and I have done this for 10 yrs or so.I have never seen this kinda problem...

So going threw oil changes when I notice fuel seperator has dirt in it.....newer trucks with aluminum tanks so only 2 ways dirt can get in.we have an outside fuel company that fills trucks at night.is it possible that the vent tube on tank will suck dirt into tanks? Its either or here just trying to eliminate the problem..before pointing a finger at fueling company..

No oil but trucks get washed weekly so no telling...

And yea its Borg Warner

So its more likely the clutch fan and not some electric sensor problem.

I have a 2012 gu713 with mp7 it has the multi speed electric clutch fan.fan works on low speed engine temp fine at idle or low ROMs.under a load the high speed doesn't work and truck over heats....new fan $ 800.00 what I want to know is can there be anything else causing the problem such as a temp sensor?do I need to change the clutch fan? And all gauges in cab work fine no codes