Your fan is not acting abnormally.
You likely have a vacuum leak in the plumbing for the A/C vacuum motors. A vacuum guage is your best bet if you are unable to locate the source of the leak by ear.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!
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