I agree with above, in our house NONE of the fans had the blue wire connected at the ceiling. When I went to do this i found the extra RED wire from the wall switch box. This allowed my to remove the existing single switch and replace it with a dual switch, one for the fan and one for the light, after I connected the RED wire to the blue wire and made the necessary connections at the new switch.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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