what causes rusty water to leak from the bottom of my car?

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  • 8 years ago
    Favorite Answer

    If u use only water or more water than coolant the inside of the radiator will rust. The fact that its leaking rust water could b just that...a leak. could also be water trapped somewhere In ur cars frame. What kind of car is it?

    Source(s): I'm a dealership service advisor
  • 8 years ago

    Could possibly be coolant leaking from the cooling system your car, which means you have rust buildup inside of the engine coolant passages and/or the radiator. Try looking underneath your car to see where the leak is coming from, I would also do a cooling system flush on your car.

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