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Message: <blockquote data-quote="ttocs" data-source="post: 908058" data-attributes="member: 11896"><p>There is no reason runnin 70 at 2500 rpm would mean that you do not have enough air over the radiator.  Do you think the fan pulls the air through at by itself at 70?  it is nowhere near that speed.  I would say your problems with heat have more to do with the underdrive pullies then the fan.  They slow down the water pump in order to gain the 3-4 hp that they give you.  Also makes it much harder on your alternator since it is designed to rotate and cool itself at a certain speed.  Slowing it down generates more heat as well as make your headlights dim at lights, even if you didn't replace the alt pulley, had to replace yours yet?  I had UDP's long enough to realize that they were not gaining me enough performance to justify the problems they cause.  Before you drop more money into a fan, why not swap those out and see if you notice the difference in performance or the difference in temps.</p></blockquote><p></p>