White Smoke from Exhaust but not Overheating - Free Car Diagnostic

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White Smoke from Exhaust but not Overheating

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Car trouble symptoms

There is a noticeable white smoke from Exhaust but not Overheating. The reason why white smoke comes out of the exhaust is that condensation is steaming off or the head gasket is damaged.

The reason why there is white smoke from the exhaust but not overheating


(1) Condensation is steaming off.
(2) The head gasket is damaged.

Condensation is Steaming Off

If white smoke from exhaust on startup happens just before the engine warmed up or before it reaches the normal operating temperature during a cold morning then it is normal, it is normal for an engine to develop white smoke from the exhaust when the engine is started cold. When the car is parked outside overnight in cold surroundings, condensation is formed inside the engine. Now during the morning when the engine is cold and the engine is started this condensation will become steam when the engine runs, the steam comes out white smoke from the exhaust of the car.

Next time when you anticipate that it is about to rain, parked the car inside the garage or in a place not exposed to the cold weather. Never parked the car outside.

Damaged Head Gasket

When the white smoke comes out of the exhaust at any engine temperature say upon starting when the engine is cold and still when the engine is warmed up and reaches its operating temperature, then it is an indication of a blown head gasket. The head gasket might have a rack or ruptured.

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The head gasket serves as a seal to keep the water that surrounds the engine from entering into the cylinders. In case you are not aware, the engine is surrounded by water to cool down the engine.

Now when the head gasket is ruptured or even develops a little crack because of wear and tear, some of the water that surrounds the engine will leak into the engine cylinders and will be burned as steam. The produced steam will then comes out of the exhaust as white smoke.

Blue Smoke from Diesel Engine
First off, blue smoke from the exhaust always means that the engine is burning oil. Of course then, what we need to do is to find out what's causing this engine to burn oil.
Learn more: Blue Smoke from Diesel Engine

It is obvious that the head gasket must be replaced. Bring the car to a car shop and tell the mechanic about your diagnosis then ask to replace only the head gasket and nothing else to fix the problem. No other part is going to be replaced other than the head gasket. Again, just a reminder, if you notice the white smoke from the exhaust after you start the engine and just before the engine warmed up or before it reaches normal operating temperature do not worry because it's normal, and nothing wrong with your car.


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