I don't remember if it was the haynes manual or the owner's manual, but somewhere I read that only one fan comes on all the time and that the second fan is an aux. that only comes on with the AC system. In my 96 the AC is broken and I've never had to use it, but I only ever have one fan.
However, I noticed that on the 94, both of the fans run when they kick on (AC off). Which is it?