I have a Maytag self defrosting refrigerator(Bottom Freezer, Top Refrigerator). A while ago the refrigerator stopped cooling. I adjusted the temperature setting to the coldest setting and it still did not cool. I noticed the vents on the back wall in the freezer were frosted up so I unplugged the unit and let it defrost for a whole day. When I plugged the unit back in, the next day, the refrigerator started working again. Then, about two weeks later, the refrigerator stopped cooling again. All the time I have had this problem, both the freezer and the ice maker have worked fine.