Quote:
Originally Posted by 425HP409
The problem appears from what you have said is that the fan is too far in the shroud. It must be about half in and half out. By being too far into the shroud, at idle the fan will just cavitate air around in the shroud as opposed to pulling it through the radiator and out the back of the shroud. You also mentioned fan roar, this can be caused by the fan being too far into the radiator causing a cavitation. Since you can't move your fan back, a solution would be to trim the shroud.
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The main reason for fan roar is there is not any fan clutch. The fan runs 100% of engine speed all the time.