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On some vehicles, coolant flows through the intake plenum. A leak or cracked plenum will allow coolant to enter the combustion chamber. Whatever the cause, you need to stop driving this vehicle until this is fixed. Serious engine damage will occur if you indeed do have coolant entering the combustion chamber. Now, if you never have to add coolant to the system, then you may just be seeing normal condensation during cold temperatures. Without seeing or smelling the exhaust, it is hard to say. If it is coolant the exhaust will smell sweet.

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Q: Besides a blown head gasket what are other possible causes of excessive white exhaust smoke or steam?
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