What causes antifreeze to come out the overflow?

when your engine is hot it causes the water to boil and the water and the anti freeze will come out of the overflow pipe.
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What would cause antifreeze to boil in overflow tank in 2003 Chevy Venture happened twice now and neither time has the temperature gone up to the red area and engine overheating light hasn't come on?

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Can no antifreeze cause no heat in a vehicle?

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Will filling up overflow tank on Honda crv with antifreeze be okay?

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