this is a shot in the dark, but i'd look for a temp switch somewhere. I *think* that the fans will run in proportion to the coolant temp, so if the sensor thinks the coolant is still hot it will continue to run the fans. That'd be my best guess
Ryan

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.