Electric fan on a Bronco is a can of worms. The radiator has a small frontal area and to get cooling it needs a LOT of air pulled through it. It takes work to pull air through a core.
Most of the economy electric fans rate in CFM. Which is a worthless measurement. How much air can it move with the restriction of a radiator in front of it?
OEM fans (Taraus, PT cruiser turbo, etc) are engineered to pull air through a radiator. The OEMs choose fans based on wattage. Wattage is volts x amps. Volts are fixed, so to get a high wattage fan you need lots of amps.
A typical good cooling fan will draw 40A, even higher turn on spike. A Bronco has a 60A alternator. Simply put, the Bronco doesn't have enough alternator to handle a cooling fan. So add an alternator to the upgrade list. Next is the wiring, stock Bronco wiring won't handle an upgraded alternator. another upgrade needed. Now the single V-belt drive squeals, more upgrades.
I've tried multiple electric fans. Never had them cool like they should. That was before summer hit.