Question about Microwave Ovens
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I remember happening to us many years ago. The cause was accumulated dirt and loose insulation material interfering with the fan blades. The solution was to unplug the refrigerator from the wall outlet, move the unit to enable reach from the back, unscrew the screws holding the back cover located at the bottom area (made of kind of cardboard), with the vacuum cleaner thin long nose attachment clean anything that looks dirty the best you can reach. Look for the fan and check nothing is interfering with it. Clean it, use a thin brush the best you can. Be careful not to hurt yourself scratching a finger or break anything bumping around cleaning. Some refrigerators design allows to reach the condenser panel (kind of a radiator or grilled looking component), if you can clean that too it will get your unit working efficiency back to maximum.
Another cause for noise could be the freezer fan hitting frozen condensate caused when the door gasket is deteriorated or not sealing well (humidity seeps in and freezes interfering with the fan operation). While you are at it look for any freezer stuff (content) sticking into the freezer fan cover and touching the fan, that may make noise too. Good luck.
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