Jay,
Try replacing the radiator cap first. Get a Stant (yes, Stant) 17 pound vented cap with a pressure release lever. If a 17 isn't available, a 16 will work, but go no lower. if this doesn't solve your problem, look into a flex fan WITH a shroud. Mechanical fans are useless without the proper shroud.
Take care
~Chris
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Retired Moderator
MustangNet
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JimPorterRacing
RACECAR spelled backwards is RACECAR
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