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Re: dual cooling fridge feezer top part of fridge warmer...
You're frosting up. Either the box is set too cold or you've got a moisture problem which requires a full defrost. The fan noise is the blades hitting ice. Leave the unit open and off for a day or more and then start with standard factory settings. Avoid open liquids and window shopping inside your fridge.
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There are 2 possibilities I can think of for the hum. When you activate that door switch it activates 2 fans and the compressor. There is one fan located on the compressor and one located in the vent system in the fridge. The second fan is used to circulate cool air evenly through the fridge. I would recommend holding your finger on the door switch and listen carefully whether the noise is coming from inside the back of the fridge or from the lower bottom. Lower bottom could indicate compressor cooling fan or compressor. They would need to be inspected. If it sounds more like the other fan mentioned above it would again need to be inspected. The compressor cooling fans can get stuck or become noisy due to bearing failure. The vent fan can get stuck or noisy but also in some cases if the defrost circuit is not working can chock up with ice and create a buzzing noise as the fan blades strike the ice.
The refrigerator half of a refrigerator/freezer does not produce any cold! The refrigerator is cooled by transferring air from the freezer to the fridge. The fridge temperature setting controls a flapper between the freezer and the fridge. There should be a fan which blows air from the freezer into the fridge (through the damper).
If the ice forming in the freezer is concealing the cooling coil and air can not move through the coils, then the overall result will be a warm freezer (even though there may be ice in one location) and a warmer yet fridge. This can be tested by unplugging the fridge and allowing a complete thaw. If the ice is the cause of the problem, then it should work for a short while until it freezes up improperly again
it could be that your cooling fan gets noisy at times and stops for a while you could try to put oil on the shaft behind the fan this will help when it does get noisy pull the fridge kisten to the motor if noisy replace it its not to expencive about 40.00 dollaresthanks from gilles