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noticed that the AC pulley is engaging, but neither of my fans come on at any time.
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Fundamentally, both fans should be running whenever the compressor is engaged (as with the Kia). However, they might be running at either slow or high speed, depending on engine temperature, vehicle speed, and compressor load. This is controlled by the ECM by switching the related relays (main fan 1, main fan 2 and sub-fan) as noted in the attached (marked) diagram.
When the engine is relatively cool, at idle, and the compressor is engaged, the fans should be running at the slower speed. Because they are in series, a problem in one fan circuit (e.g open fan connector) can prevent both from working. But if the engine temperature is above normal, both fans should be running at the higher speed (whether or not the AC is on), and even if one fan circuit is defective, the other one should be running.
It's fairly easy to set up the first condition (cool engine with AC on), but what about the second? Is neither fan running when the temp gauge is above normal and the compressor clutch is engaged? If one of the fans is running in the latter instance, this will isolate the problem to the other fan circuit.
While it's not likely that both motors, or a pair of relays, or more than one fuse, will have failed at the same time, it is possible for this to have occured in stages without it being noticed. All the relevant fuses should be checked by confirming actual resistance rather than the "tone" indicator. (Use the lowest resistance range, and make sure that the resistance reading for the fuse, when removed from the socket, is far less than one Ohm. This is because many digital Ohmmeters will give a "tone" indicating continuity anywhere between zero and up to 200 Ohms, whereas a fuse with even 10 Ohms of resistance can indicate a defect.)
From the diagram it looks as if main fan relay 1 and the sub-fan relay (and, as you noted the AC relay) appear to all be the same. So you might be able to verify the main fan relay by putting it in the AC relay position and seeing if the compressor clutch engages.
The main fan relay 2 is a different relay altogether and would have to be checked independently.
Because the ground connection (in the diagram, below the main fan motor) is common to both fans at both speeds, make sure that it is good. With the engine off, at either fan connector (the one from the harness) check that the resistance at pin 1 is less than 5 Ohms to a good chassis ground point.