Originally Posted by Robin Stone
...There is a piece of sheet metal that holds it on the side that I can fiquire out where it goes,
but there is a small cooling fan attached to some sheet metal
that I can't fiquire out how it mounts.
Hard to imagine what the "piece of sheet metal" is without a photo or better description of its location. That being said, I've found that most of the "loose" sheet metal around the fridge is part of a baffle in the lower back that keeps the wind from blowing the fire out. Not necessary, but it's a pain to have the fridge quite as soon as you start driving.
The fans, in my experience, were added by owners who needed to get a little more performance out of the fridge in hot weather. You can mount it to blow on the exposed coils in the back of the fridge, but make sure that it doesn't impede the natural flow of air up from the bottom and out the fridge vent. Even better, mount the fan so it assists that natural flow.
As far as the switch is concerned, you can put it where you like, but I recommend a small LED indicator in a conspicuous place that will remind you it is on (maybe you can hear it, instead).
A better fan installation is one that runs on a small solar panel so it is on during the day and automatically off at night. These are normally sold to put in a car window.