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That'll be your coolant, and there could be a number of things causing it... a blown head gasket will do it... a coolant leak where the coolant leaks onto a hot engine block will do it... a faulty radiator cap which opens too easily can cause this.... excess coolant causing the system to overpressurize and have to relive frequently will, as well.

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8y ago

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Probably a coolant leak. Have it checked soon!

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8y ago
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