Staff Answer
Sep 24, 2026 - 08:41 PM
Norcold changed the thermistor design over the years, so an older original can look different from the current replacement, including the wiring and plug. The 636658/ 621742/ 50665 is the current thermistor that replaced the 618548 on the N6XX/ N8XX. Because yours looks different, send us a photo of it and of where it plugs in so we can confirm it matches your fridge. Since I can't confirm this 100% from here, please email us at info@rvfridgeguys.com or call 800-712-8822 with your model and serial number and we'll double-check it for you. You can also browse www.rvfridgeguys.com.
