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So to be clear, you removed the back panel inside the freezer and there is no ice or frost accumulation which means you don't have a defrost issue and since the fan is running, something is just blocking the air from flowing into the refrigerator from the freezer. That means that your damper inside the refrigerator section isn't opening. This is the flap behind the center vent located below the ceiling against the back wall directly in the middle. Below is a link to the damper.
CLICK HERE for damper assembly
Now either this damper is bad or the thermistor which measures the refrigerator temperature is bad. To know which is bad, just listen to the refrigerator. If it runs non-stop, then it's trying to cool and that means your thermistor is working properly because it's trying to cool the refrigerator down. If it stops running often like it think it has reached the correct temperature even though it hasn't, then you have a faulty damper and the damper needs to be replaced. The thermistor sensor is located above the light housing at the top of the refrigerator if you need to replace it. Typically the damper is the part that fails and the flap won't open to allow air into the refrigerator which can be visually confirmed when accessing the damper.
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I am a different tech, Barry is not available at the moment,
Check the vents slots on the WHITE lower back panel in the freezer you should be able to see vertical aluminum fins there. If you see white frost in between there you may have a defrost issue. If not and the fins are clear and you can see them them I would check for air flow from the fan and then remove the back panel. Once off check the fan blade and above the fan there is a duct channel, If the door was left ajar the duct channel can get iced or frosted up blocking airflow to the refrigerator. I would check that with an inspection mirror and flashlight to see and use a steamer or hairdryer or unplug the unit for several hours to clear that blockage. With the panel off you can then check the main evaporator for excessive frosting as well if you are actually having a defrost issue.
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SIr I am Appliance Guru and know this unit inside and out as I am factory trained and work on them in real life not like other online techs only. Just ask for me Appliance Guru for the correct guidance without just changing parts out.
Sir I can actually prove that I run and own a real service business. You should ask Tyler for this information.
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