I have been having the same type problem. My freezer freezes but refrigerator side is warming up. I think we're talking to different sets of coils and two fans. The dusty coils on the outside of the refrigerator and that fan are probably working OK. But you have another fan and set of coils inside the freezer compartment. In my Maytag these coils and fan are behind a panel at the back of the freezer. If the defroster is not working these coils can frost up and not allow the fan to circulate cold air from the freezer into the refrigerator section. When I removed the back panel in my freezer I found the coils were frosted so heavily no air could circulate. So my question is how do you troubleshoot the defroster? This might be your problem also. I also read on another Web site a good thing to do is set the freezer and refrigerator temperature controllers back to midrange for a day. This has helped me on a few occasions where turning them up to max cold was not working. Anyway, good luck to all of us. Summer is bad time to loose your cool.
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