I added one in the lower compartment blowing up to help with the up draft. I heard a fan noise last year and my fan was not running. I looked down from the top vent on my fridge which is mounted on a slide out. There was a muffin fan about a foot or so blowing in the same direction as mine. It is controlled by a thermostat and you should not have to do anything except make sure it is clear.
Mine only runs when it is very hot outside.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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