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Mike i have never heard mine either. My 99 s10 4.3 i actually hear it kick on and off and its usually loud when kicking on because of how fast its spinning you hear the sir being pulled. Seeing that picture of your car with the plastic being pulled towards the bumper makes me think the clutch kicks on and turned pretty much into a vacuum like pull. I got my fan shroud and gktech fan with clutch installed and havent had any rise in temp ofer 190 so hopefully im good to go. Highway speeds my temps read 160 170 range which im happy with that.
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