There should be two cooling fans at the top of the cooling coils and you should hear them on a hot day and feel the draft up through the back vent area of fridge.
They get their 12v through a heat thermistor switch at top of cooling coils they have been known to fail at times.
You can place a 110 fan at the base of fridge floor pointed up until you can have checked out they will have to pull fridge to replace heat thermistor.
The fan plugged into 110 outlet should drop the temp's inside fridge.
COOLING FANS