Cooling fans running on hi speed right after start up, A/C not on.

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Hi all...My 2000 Windstar, 3.8, 114,000 mile van's cooling fans have recently started to run on hi-speed right after start up, cold engine, and no A/C on. Sometimes they will run continuously, sometimes turn off after driving a while, but usually come back on again after that. No other problems,..just the annoying noise from the fans. thanks.