My fridge is in a '97 model trailer. Over the years I have made it work much better than when I got it.
First I saw the air that came in the bottom vent could go right out the top. Made a baffle (cardboard shaped, then covered with duct tape) from the top of vent to the bottom of fins. This makes all the air go between fins. Then I found the top of cabinet was warm, so made another baffle from top of fins to top of upper vent. This is sloped so the natural rise of the warmer air (heated by fins) is pushed out the vent. Also I used some light gauge of that metal I can't say or spell to help guide the heat from chimney out vent.
I have one of the little fans, but only turn it on if I expect the temps over 100.
