I have the usual problem of my refrigerator not getting cold enough this time of year. With ambient temps in the high 80's or low 90's the refer temp is around 50, though it will drop to the mid 30's (where I want it) overnight. Same story running on gas or electric and the fridge is a Dometic RM-100.
Our I.T. guy at work was throwing out some assorted parts the other day so I grabbed a 3.6" 12 volt
DC cooling fan. I've heard of people rigging these by the condenser coils of their fridge or up at the top vent and improved performance on hot days so I thought I'd give it a shot.
Not wanting to pull out the fridge to install it, and considering that the fan is a little large, I placed it at the top of the outside access panel, tilted at about a 45 degree angle. See the photo below. It's held in place at the bottom with angle brackets and the fan's original rubber mounting studs, and anchored at the top with zip ties to keep it from flopping around on the road. The wire goes thru the wall and into my credenza where it is connected to a 12 volt
plug. The credenza has a 12 volt
outlet inside it, so just plug in and the fan runs.
Today's ambient temperature is 102. Inside the refrigerator its a nice cool 40 degrees. I'd like it a bit cooler, but I'm satisfied with the dramatic improvement.
I'd like to take this one step more by installing a thermostat of some kind, if I can get one cheap. Any suggestions?