What Is an Overflow Tank in a Car? | What It Does And Checks

A car’s overflow tank is the coolant reservoir that catches expanding coolant and draws it back into the radiator as the engine cools. Pop your hood and you’ll spot a translucent plastic bottle with “MIN” and “MAX” lines. That’s the overflow tank. Some cars label it “coolant reservoir,” “reserve tank,” or “expansion tank.” Same job,

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