running down the back center on the fridge . Follow the hose down towhere it ends , then bring it out towards you . Blow into the end of the hose as hard as you can to clear out the drain system . Depending on the make and model of fridge , you may have to defrost the fridge for a full 18-24 hours before doing this . if both sections are cooling fine, it is NOT time for a replacement sorry, its time to clear the drain, alot of times doors can be left open thus causing a back flow of moisture which builds up in your drain tube, to access this on your top mount freezer, is remove the back wall of the freezer usually four 1/4" or phillips screws and boom if theres an ice maker youll have to remove that. as well obviously the shelp inside, once your inside youll notic the bottom under the coils looks like a sheet of ice...ready to make a little mess??? ok your going to need some hot water me i use a good size coffee mug fill it with water and microwave it for about a minute or two, pour the water over the ice melting some and maybe causing a cracking affect in weak spots, with a plastic putty kife try to pry up the ice being careful, once youve got most out you can then clear the drain hole which when the rest of the ice is