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It means that you have a coolant leak. You need to have the system pressure tested for leaks.

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Q: What does it mean when overflow tank empties itself?
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What does it mean when coolant in overflow tank is low and is leaking antifreeze from that side of the car?

The overflow tank is either cracked or its overheating and leaking from the cap


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Rust from your cooling system is flowing back into the overflow tank when the motor warms up.


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Can your black tank overflow to your grey tank in your trailer?

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It has a tube between itself and the radiator. As coolant heats up, it expands. The expanding coolant goes through the tube into the overflow tank. Later, when the vehicle is shut off and the radiator cools, the overflow is pulled back into the radiator. The system is "closed", hence the coolant does not just "dribble away" when it expands like it did in vehicles many years ago.


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