Product review (1 stars): Diffuser was faulty...looking for replacement.
Although I placed this item in my Kenmore Refrigerator, I was never able to adjust the temperature to the recommended settings of  as indicated in my user manual. These are 37F and 0F for refrigerator and freezer. After many months with the refrigerator and freezer at the maximum "warm" temperatures 41F and 5F my food remained extremely cold.  Finally, after many months of losing food due to freezing temperatures, I contacted an appliance repair facility and the repairman suggested I use the internal diagnostic test for the Kenmore. The test showed that the diffuser was "good" and was cycling open and closed. I checked this with a mirror and could see that the diffuser appeared to be working. But after months of losing food to freezing temperatures, I placed tape across the diffuser "window" and FINALLY the temperatures were within the recommended temps of REF and Freezer. I believe, even after this much time has passed, Amazon should send me a replacement