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I don't know - I would describe the noise as being like the wind blowing across a chimney. I have never owned a fridge that didn't make such a noise as it grew older - while it was on a cooling cycle and afterwards it sounds like water trickling. It doesn't seem to affect the performance though and I manage to ignore it.
Very common problem is the evap fan located in the freezer section is the cause. Sorry but this is controlled by the main board on the back and only way to fix the problem is with a new board. Sorry about the news but it is the problem.
You have to isolate this problem. It could be one of three things. The compressor, the condenser fan motor or the water valve that feeds the ice maker and wtaer dispenser. Also if the high pitch sound is compared to that of a bird then it is definitely the condenser motor. To isolate the problem take the back cover off. LISTEN FOR THE HIGH PITCHED/HUMMING NOISE! Use a flash light and see if you can tell where it is coming from while it is doing the noise. Dont try this unless you know what your doing. Stop the condenser fan blade with the end of a hard object, but stop it gradually. Dont try this cause you might brake/bend the blade. But if you did and the noise stop then you figured out your problem. If not ythen disconnect the water valve. It has to doulble harness wires attached to it. if problem still exisit then it has to come from the compressor. Unless you have a warranty then theres nothing no one can do except change it. $300-400 job easily.
The compressor moves the coolant through the unit, and the fan moves the air. Both have spinning motors that need lubricant to remain in good working order. When these items begin to fail, if they don't shut down completely, you will hear metal rubbing against metal, the high pitched noise. Normally these are sealed with plenty of lubricant and need no routine maintenance.
The bad news is there is not much you can do on your own. One fix that rarely works, but is worth a try because it is free, is to alter the balance of the appliance. Sometimes just raising the front or the back or the side shifts the weight in the offending motor off of the metal rubbing parts. Some appliances have adjustable "feet" that you can twist in or out for this purpose. Please don't tip the appliance so far that it is unstable. If this makes the whine go away, remember that this is only a temporary solution. It might last long enough for a repairman to replace the part, or it might last long enough to save up for a new appliance, but the whine will return.
I am not posotive, but it sounds like you may have a piece of debris stuck in the fan underneath. You can check if you pull it out from the wall, make sure you unplug it as to not have the fan come on while you are toying. But thats what it sounds like. If that is not it, I am sure you could locate the noise with it pulled out from the wall, and go from there, Possibly your compressor, but sounds like the fan the way you're explaining it. Good luck
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