It would certainly effect cooling ability in hot weather, especially with sun on that side. Unfortunately, unless the refer is on slide and you have a vent to get to the back top side of the box, it is hard to test or replace the temp switch without taking the fridge out of it's place. Same for replacing the fans if failed but there should be more than one fan. I don't remember where the fan power is coming from or whether there is a fuse for them in the black box at the back, you manual should show it. As a dirty workaround, rigging an auxiliary fan into the vent hole...