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coolant problem on 1991 Nissan 240SX

what causes gasoline to get into my coolant system

Asked by for the 1991 Nissan 240SX
Gasoline has no way of getting into the cooling system unless some one inadvertently puts it into the cooling system. Gasoline is part of the combustion process, if a head gasket fails Carbon Monoxide which is a by product of gasoline combustion can be found in the cooling system.