fan inside fridge not blowing

is the ice on the floor of the freezer?if so the freezer drain is blocked,ice is building up and the fan blade is jammed from the ice.when the machine gets cold ice forms on the evap coil in the freezer,when it goes into defrost the heater turns on and melts the ice and the water drains down a hole under the evap coil and the water goes down into a pan where it evaporates from the heat of the compressor and condenser coil but your drain is blocked and the water is leaking onto the floor of the freezer instead of going down the drain,i use a steemer to clear blocked drains but if you don't have a steemer you can use a hair dryer to melt out the ice,on your machine you can pull out the machine from the wall,remove the back bottom panel and unplug it first,then look at the right side,you'll see a plastic drain line with a wire tie around it,that's the drain line,you might have to cut the tie and then pull the drain line down and remove it,now go to the freezer,you have to remove the door and racks and then remove the back inside wall of the freezer,melt out all the ice that you see with the hair dryer,after you melt the ice go to the back and snake a long plastic tie like the one that's on the drain line or if you have a piece of 1/4 inch plastic water line or anything you can think of to snake through the hole where the drain line came off of,i would use plastic,if you use metal be careful not to damage anything,then pour hot water into the drain in the freezer,if it drains out the back hole you're done,if not keep hitting it with heat and if you have a turkey baster or anything that will push air down the hole to clear it and when you think it's clear pour more hot water into the hole until it drains.hope this helps and good luck with your machine.