Join Date: Feb 2010
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Sounds like vapor from combustion products. Remember, burning any hydrocarbon produces lots of water vapor. Since the engine is FW cooled the only other way for water to get into the cylinders while running is from the FW cooling loop via a bad head gasket. If the coolant level isn't going down, and you don't appear to have a lot of gas bubbling out of the coolant overflow tank, the engine is probably fine.
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