Components of the Radiator Fan System
 

I'm still having an issue with my radiator fan not engaging when I turn on the AC (96' 850 Base Sedan) So far, I've replaced the thermostat, fan relay, coolant temp sensor, and the fan motor/assembly itself. What are the other main components of the system that tells the fan when to turn on and off? The fan does not turn on with the A/C but the A/C still works regardless of engine temperature.
Thanks for any input!
-Luke