More fan/electrical questions

OK, just did a long search on this subject here but I’m still unclear on which fan is AC and which is radiator. Passenger side is AC?
Also, on parts names, I see stuff in the local chains called “fan switch”, “engine temperature sensor”, “coolant temperature sensor”, “temperature switch” and “cooling fan control”.
So, I guess there’s a sensor on the engine that supplies voltage to the “fan relay” which then turns on the fan.
Anybody know which one of these parts is the relay and the sensor that turns the fan on?

thanks,
js

the fan on the driver’s side is the A/C fan