Dometic fridge ?

Is your fridge in a slide? Once slides became common, it no longer worked to have a vent in the roof directly over the fridge. That was the best arrangement to keep air moving over the outside fins. With the fridge in a slide, you rely on a top and bottom wall vent and the fridge mfgs specify fans to keep the back of the fridge from overheating. The fans are pretty reliable but I see a lot of the little sensors (screwed to one of the upper fins) failing. If the fans quit, the fridge will not cool properly. Jump the sensor to see if the fans still work. In a pinch, you can just leave it jumped until you get a new sensor, you just have to put up with the slight fan noise. The cooling units are either good or bad. The ammonia/gas charge is so small a tiny leak renders them useless in one day. When the sealed cooling unit goes bad, you will see a yellowish powder around the leak area and/or smell ammonia for a day or two. If it is cooling at all, the cooling system is good. You have either a heat source (gas or electric) or outside ventilation problem.