whirlpool princess horrible noise from plate on back of fridge.

My fridge is making a horrible noise that seems to be centered from behind a metal plate on the back of it. I am tempted to take the plate off and see what is under it but might not be a great idea. It sounds like something mechanical is there… a fan maybe?

This is the plate with the wire hookup out of the side of it. Anyone have any ideas what could be causing this noise and if I can swap out/ clean out a part easily?