Nothing wrong with a pusher fan if that's what your asking, I am using one on my Barracuda with a Wizard radiator that has dual 1.5" cores.......zero overheating issues.
Of course there's something wrong with pusher fan. Your cooling system shouldn't need it, and it obstructs airflow through the radiator. There are both mechanical and electric fan options that work great standalone. If you need a pusher fan in addition to a mechanical fan to keep from overheating you either aren't running enough radiator or your mechanical fan isn't up to it's job. Both can be remedied and the result is a more efficient system than what you get throwing a pusher fan band aid into the system.