I have a 1994 caprice 5.7 liter v8 with two cooling fans. The second one is only supposed to come on when the a/c is running. It does not due to the Engine Control Module (computer brain) not telling it to. The fan was tested with a direct wire and it works fine. The options are to replace the ECM or run a jump wire where the relay for you fan(s) are and connect a toggle switch to it and cut it off and on as needed. .
The cooling fans are set to come on when the coolant reaches 224 degrees (low speed) and 240 degrees (high speed). If they do not turn on (without the AC) then either your coolant does not reach 224, or the switch that turns them on and off is bad. The switch should not be hard to replace, or too expensive. Since you mention that they do come on with the AC, then we know it's not the fans themselves.
The fan engagement threshold is set high in those cars. I have a 96 myself and it gets above 220 before the fans kick in. I would by a programmer for the car such as hypertech to set the fan engagement to a lower level. Or a cheaper solution would be to hook up a toggle switch for the fans to come on when you need them. This is all assuming your fans work at all. Next time it heats up, turn on your AC. If the temp falls, your fans are in working order :).
The cooling fans will run when there is a signal calling for them to come on. High temps will do that. Also anytime the ac is on, a fan will run. Try turning the ac off and see if one of the fans stop. Do this when the engine is cold. If the fans run anyway, check your fan relays, they may be stuck on.
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