I put in a $10 computer case fan with Blue LEDS in the outside space moving air up and through the cooling fins at the roof line.
Inside the refer, I installed a 3" computer case fan. Hung it off the bottom of the top shelf.
Tapped off of the refer 12 volt power block and installed a switch in the door frame area of the refer to control both fans.
I truly believe it helps with the ventilation of the refer over the cooling fins at the roof line and with the interior temp. as well.
The Blue LEDS add a custom touch that alot of people scratch their head and wonder what that light is.
When my bath fan blew apart, I replaced it with a 10" computer case fan with Blue LEDS. It lights up the bathroom just enough at nite to keep from having to use the regular light and it keeps the air flowing and it looks cool from the outside as it makes the vent cover glow BLUE. It is way quiter than the original fan.