fridge not getting cold?

If you have nothing frozen, just put in any thermal mass like pop cans, water bottles, apples, ect. The cooler the items are the better, but room temperature items will also work. A fridge works a lot better with thermal mass. Air temperature changes very quickly, so the fridge works very hard to remove the heat from the air. If you add a full fridge of thermal mass the fridge works to cool those items, once they are cold they help to offset heat gain from ambient outside (outside the fridge) temperatures.

A fully-loaded fridge will cool faster then an empty fridge, sounds wrong.... but it works.