A refrigerator includes a direct contact ice making system in conjunction with a circulating liquid coolant. The ice making system includes a coolant loop and an air flow chamber on a portion of the loop. The air flow chamber includes channels formed by offset protrusions, which direct air back and forth over the portion of the cooling loop to cool ambient air within the ice making system. The cooled air is then directed by a fan and supply duct to an ice storage container to prevent ice cubes in the container from melting. Once the air has warmed in the container, it is directed by a return duct to the beginning of the air flow chamber to begin the process over once again, thus creating a recirculation of air within a refrigerator system to cool an ice storage container.