[CREWZIN]

I did a search and can't find anyone else with your problem.

There are many components that come into play to turn the fan on and off. Relay (both high and low) PCM, ECT (Engine Coolant Temperature) sensor and maybe more.

My guess would be one of the relays. If it's the high speed fan then you can switch the relay from the horn to the place where the high speed relay is because they are both the same kind of relay. If it's the low speed, that relay if different from any other relay in the fuse box.

Is the compressor also going on and off at the same time as the fan? If it is, that's a sign of low pressure in the air-conditioning system and the problem might be the high pressure switch (I had that go bad) or low R-134 in the system itself.