Get to know what it does when it is working properly, so that you have something to compare it to when it breaks down. Does your fridge have a fan under/behind it? Is there one inside the freezer? The fridge? In-between? Listen and feel for fans blowing when the fridge is running. Look for ducts in the fridge where air should come in. Do you feel the cool air coming in through the vent/duct? Is the duct blocked by food or snow/ice? If you want something to chill quickly put it near a vent.