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Having limited information...the black marks may be the result of warm water vapor condensating on the cooler wall surface and allowing for a mold to grow. If this is the case, you can clean the area with a dilute solution of bleach and water.
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∙ 10y ago
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What causes a radiator to boil over in a minute?
pot
What causes itchy bumps all over and marks that look like hickeys?
rash
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I had this problem ....Head Gasket or radiator cap
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Rub cut raw potato slices over it.
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