I would think if the fan is doing it job the clutch should disengage when you get going(after 1 minute or so), and then the clutch should just be letting the wind coming through the radiator make the fan move, UNLESS its hot enough for the afore metioned spring to change the valving inside to applie the fan. OR the fan clutch never got the right part to begin with. I have seen dealers "throw on" what fits , rather then getting the right part.
good luck.
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