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From air trapped in he block of your engine. If you recently drained your coolant air is trapped in the system. You will need to bleed all air from the cooling system. If you have not recently changed the coolant this is a sign of a blown head gasket. Other symptoms are white smoke from the exhaust, loss of coolant with no apparent leak, oil level overfull, and a white foamy substance under the oil fill cap. Stop driving the vehicle unit this is repaired.

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14y ago

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