Back to the topic of better cooling
to my knowledge there are no after market fans
the best way to cool an engine is good water flow ,water pump working good
T-stat working good and radiator clean on the inside
The best way to cool the water is good air flow ,fan working good and radiator clean on the out side
This is about Transmission Cooling issues, not engine... People with the separate coolers can't conform to this information anyway, since the cooler is SEPARATE... Also, there are plenty after market electric fans; you can buy an aux electric fan at PepBoyz, AutoZone, and Advance Auto or whatever major auto chain is in your area. As for placing it? That's another issue.
The best thing to do, IF you want the work: Is buy the older Liberty rad with the trans cooler lines in it. Then run the OEM cooler AFTER the rad as AUX, on the return line - through the cooler, then to the transmission. Heat is the #1 killer of transmissions, anyone with a Chrysler product would know that, at one point in time... I added one to my A604 on the Avenger I has, it has 153k miles on it when traded, no slipping or shifting issues. If I had the time, I would do the RAD swap and use the OEM as AUX cooler for mine... The OEM coolers on the Jeep they use, are a lot larger than store bought AUX, heavy-duty coolers... I had a medium duty on the Avenger, and it was about 1/4 the size of this thing... I could fit FOUR of those on TOP of the the liberty has in it...
Now, with the just the RAD cooler the earlier models got, your temp is more constant, and even. The newer ones with the separate cooler causes temperature spikes, and that's not entirely all that good for the transmission. Still, they made it that way, and warrantied them too, so they can't be ALL that bad...
Making the motor cooler in this case, won't help the new liberty with the front mounted cooler... You would have to add the mechanical fan, at the cost of; loss of to the wheel HP and Torque, to keep air-flow constant on the cooler. You can add a SMALL electric fan, and front mount as PUSH IN, they are water-proof... You can mount it right to the trans cooler of you want.