Norcold Thermistor and Cover 640149/ 50888 (N8DC/ N10DC/ N15DC/ N20DC) Genuine Norcold Replacement. Restores Accurate Temperature Control. The Norcold 640149/ 50888 Thermistor and Cover is an OEM replacement part designed for Norcold N8DC, N10DC, N15DC, and N20DC refrigerator models. The t... See More