I just wanted to share a part number I recently received from Whirlpool after much arguing and tons of recalls for this issue. I work in Northern VA area, and we have ran a lot of builder calls around here with the top shelf freezing on the SXS for the last 2 years. Whirlpool made us change sensors, pcb, dampers, blame the customer for blocking the back shelves, applying permgum inside damper area, etc. There haven't been many techs on our team that have run into this as much as the few of us stuck running new home calls. I found out they made a new damper design to fix this issue, but did not have a part# for a long time. I was to the point of telling the customer not to call us back for this issue and contact their builder and Whirlpool, so they could get this new damper. Well the part# for this new damper is W10572852. I hope this helps anyone that may run into this issue. I do not have specific model numbers, but it has mainly been the SXS manufactured in the last couple years with the ice makers located on the freezer door.

Whirlpool Service Pointer issued for this problem.

Replacement damper assembly.

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Source: Newer Whirlpool SXS freezing on the top shelf