Question: what does it mean when there is white smoke coming out of the exhaust?
Answer: Causes of White Exhaust Smoke. ... One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine.