The condenser fan is located next to the compressor and blows air across the condenser coils, which cools hot refrigerant from the compressor. A faulty fan increases the cabinet temperature, which can also overheat the compressor. This causes the compressor to eventually break down if the condenser fan isn't fixed.
When your fridge and freezer stop cooling it can quickly become an expensive fix
This video from Sears PartsDirect explains how to troubleshoot problems with your refrigerator when it's not cooling, including checking for frost buildup and .
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Clogged coils can cause poor cooling. Check to make sure nothing is stuck in the condenser fan and that it spins freely (models with coils on the back won't have a fan). To do this, unplug the fridge and pull it out. Clean the fan blades and spin the fan by hand to see if it's stuck.