The question could be improved to read: "Why does steam come out of the exhaust when I first start my vehicle?" Answer: condensation. When you shut-off your engine and the the exhaust pipes cool down, water will condense on the interior surfaces of the pipes from the warm air in the exhaust pipes. This water pools there until the engine starts up again. Then, it starts to evaporate and exits the tailpipe as steam. After all the liquid water evaporates and the exhaust pipes get too hot for water to remain on their surfaces, the visible steam will cease to emerge from the tailpipe. So, no; it is most likely not from a blown head gasket or a crack in the engine. If you are not losing coolant then all is well, drive happy
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