Norcold Cold Weather Kit 634913/ 50761 (cooling unit heater) This heat strip is designed to warm up the areas on the cooling unit that can be negatively effected by extreme cold temperatures.Fits these Norcold refrigerator models:2118 series: 2118, 2118IM, 2118IMD, 2118BK, 2118IMBK, 2118IMBKD, ... See More