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Why radiator fluid looks rusty?

Updated: 10/23/2022
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17y ago

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The cast iron in the block is starting to rust. Drain the radiator, put in a good radiator flush solution and follow the directions, then fill the radiator with the right coolant. Since you're already having rust problems, put in some rust inhibitor. You may need to clean it again and put in more rust inhibitor after things settle down.

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17y ago
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Q: Why radiator fluid looks rusty?
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