Staff Answer
Sep 24, 2026 - 06:34 PM
Not quite. They all do the same basic job, but Norcold thermistors aren't interchangeable across model families. The connector, the lead length, and how they mount to the fins differ, and some models (like the 2117/ 2118) use a different rod/ air style sensor. The 638391/ 50824 you're looking at is specifically for the Polar N7, N8 and N10 models.
The safest bet is to order by your fridge model. You can see them all on our Norcold thermistors page. If you want to check your old one first, here's how to quickly test a Norcold thermistor. If you have any questions, just reach out at info@rvfridgeguys.com or call us at 800-712-8822. You can find everything we carry at www.rvfridgeguys.com.
