If you're switching to a front mount, you can delete it.
If you have a stock location intercooler, keep it.
Some think it's to keep air moving over the IC at low speed, but it's actually at high speeds when it really matters. Air packs into the engine bay and pressurizes it. That fan creates a low pressure area behind the intercooler so air will keep moving through it.
In-between the FMIC and the radiator, so the fan would be on the "backside" of the fmic- aka the side you would not see if you were looking at the fmic from the front of the car. I figure the fan moves enough air to help pull more air across the IC core, and hopefully the increase in velocity of the airflow (because of the fan) will help cool the radiator off better as well, as you would still have your radiator fans on the backside of the radiator as well.