The fan in the freezer compartment is no longer working on my fridge. The freezer is on top, with a seperate door.

The fan seems to blow cold air from the freezer into a hole in the back, which I assume goes down into the fridge to cool the fridge. The freezer part works ok, but the temp in the fridge is only about 57F and my food is spoiling. Does this fan blow into the hole, or suck air from the hole? I tried putting a different fan in there to blow freezing air into the hole, but the fridge is still not cooling down. I wonder if maybe I need to reverse the fan, or maybe its just not blowing enough air?

thanks for any help or suggestions!