well think you might have a problem if you can turn the screw a full 360 degree it is only supposed to go 3/4 of a full turn. think that might be your problem as you may have stripped that lil screw for the controller. that is werid as when my truck hits a certain temp both fans kick on. i see what you are saying. only thing i can think of is double check the wiring. and make sure all connections are good and solid.
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2007 Supercab few mods here and there
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