Check your coolant and make sure it isn't low or empty.
I found that when my coolant tank was close to empty (just a little in the bottom)that my fan ran more than when the coolant tank was filled to spec.
Plus depending on the position of the A/C switch will turn the fan on. MAX A/C, MORM A/C, MIX, and DEFROST will turn it on in a 98+ Vic. Any questions consult your Owner's Manual.
1999 Deep Wedgewood Blue & Rust P71, 21x,xxx miles, full cloth interior, 3L55 RAR, BH1976 Headlight Relay Harness, and a few other mods. Former Chippewa Falls, WI PD car. I'm the 3rd owner of car.
Now with Mustang Wheels, Honeycomb Grille, and Ford AM/FM CD player with RDS.
Download your Owner's Manual FREE from the Ford Owner's Site