The refrigerator is cooled by transferring the heat overboard to a coil. This one is showing signs of corrosion, but the zincs are near perfect. Did a previous owner neglect changing the zincs at one time? Do I need to replace this at this point? Interestingly one model of this heat exchanger is a completely exposed copper coil. Frigokeel http://imgur.com/0KJG9QA
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