Norcold AC Heater Element 637136 (fits the 2118 model) This AC Heating element fits the Norcold 2118 model refrigerator, regardless of serial number. Fits these Norcold refrigerator models:2118 series: 2118, 2118IM, 2118IMD, 2118BK, 2118IMBK, 2118IMBKD, 2118SS, 2118IMSS, 2118IMSSD