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I woke to find antifreeze all over the driveway. My reservoir was empty. I took it to the radiator shop and they said I had to leaks. Then I remembered I had the warranty so I took it to the dealership, and all of a sudden I don't have any leaks. Long story short, I think the dealership put stop leak into radiator.

Is there a way to tell if they fixed the radiator vs. putting stop leak in it? For example, if they put stop leak into the radiator, would I be able to tell visually by looking at the antifreeze? Mine has black white grayish powdery stuff and I'm wondering why.

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Sounds at least plausible. There are two different types of stop leaks that I'm aware of. One is a silvery substance; the other has chunks of gunk suspended in some type of fluid. I've had success with both of them, but these will usually only work as a stop gap measure. The leak will usually reappear or a new leak will appear of the same nature as the first.

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