Ours is a residential refrigerator and that’s how I did it. Both my kids have what I believe is your refrigerator in their campers. They were just telling me how they adjust the temperature. They said there is a little metal slide with a wire on it attached to the fins inside of the refrigerator, by sliding that up and down on the fins determines the temperature. I hope this helps you, I know what you’re going through. Good luck
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