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Hi,
The fan is hitting on ice buildup...unit is not defrosting... There are a few reasons why the refrigerator part will not cool...here are a couple of tips that will help you to figure out why the refrigerantor is not cooling...
Need to unplug the refrigerator and remove the cover inside freezer compartment. Sounds like the evaporator fan is hitting something and we need to resolve this as soon as possible. Thanks Sea Breeze
it is most likely the fan bushings that are making the noise. you can try to lube them with a light oil if you want to buy some time. but the fan motor will need to be replaced soon.
It is very common for the fan inside the freezer to develop a loud noise as it runs. Its in an environment that is hard on them, cold, wet. Its a small and simple motor, and you are right in believing there will be more problem in the future, as the stator is probably touching the housing. It has a sleeve type bearing, and its probably worn a little causing the shaft to wobble. Eventually it will stop completely and the freezer will get warm.
You are correct in believing the fan is going to be a problem. The evaporator fans inside the freezer compartment are common at going bad. I believe it is due to the extreme temperature and moisture conditions inside the application. The noise is the stator or bearing equivalent going out, the speed should remain constant. It may eventually make a screeching noise upon start up, or just lock up completely. The good news is replacements are relatively cheap and easy to find. If you do replace it yourself, make sure the fan blades are blowing in the right direction. If possible, remove the old one and bring it with you to the local appliance parts supplier and he should be able to help you get the right one, it will probably be a kit of some sort with multiple mounting brackets, screws, and maybe even a couple of blades. don't let this intimidate you. Most of this you will not use.
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