Solving freezing vent in refrigerator

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I have a KitchenAid refrigerator model KSRS22MWMWS, a side by side model purchased in 2011. In the wall between the freezer and refrigerator is a vent in which ice builds up until it becomes completely blocked, jamming against the sliding drawer:

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The temperature controls are at the default. Some ice appears elsewhere in the unit, but not as bad as here. I've defrosted this area with a hair dryer in the past (it's hard because the structure of the vent is foam, so can't take the heat). But the problem comes back.

What might be wrong and how can it be fixed?

Best Answer

you may have a badly closing door seal. if you get a small air leak into the refrigerator, the air keeps the fridge warmer than it wants to be, so it keeps running the compressor to try to cool the fridge. as it runs, condensation forms internally and will build up in certain areas, and freezes into ice. i would have a look at your door seal. just take a thin flat blade of plastic (don't use steel as you can scratch the seal or the mating face) and slide it around the contact point of the seal and the chassis. you should feel slight resistance everywhere, indicating the mating of seal and mating face. anyplace you have a drop in resistance, the seal is letting air into the fridge. this is usually fixed by levelling the fridge properly. the raising and lowering of the fridge corners will make the chassis flex back into a truly rectangular box so that the door is parallel on all four edges.

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