White smoke from exhaust of car before engine warmed up
If a white smoke happens before the engine warmed up or before it reaches the normal operating temperature during a cold morning then it is normal. When the car is parked outside overnight on cold surroundings, a condensation is formed inside the engine. This condensation will become steam when the engine runs and comes out a white smoke from exhaust of car.
White smoke from exhaust is notice at any engine temperature
If white smoke from exhaust is notice at any engine temperature, regardless of the temperature of the surroundings.
Troubleshooting white smoke from exhaust of car
When the white smoke is notice to come out from the exhaust at any engine temperature such as when the engine is cold, warm or hot suggest a problem on the head gasket in which the gasket might be ruptured or have crack.
In case you are not aware, the engine is surrounded by water to cool down the engine. Now the purpose of the head gasket is to prevent the water that surrounds the engine from entering the combustion chamber. When the head gasket developed a crack because of wear and tear the water that surrounds the engine will leak out into the cylinder, this water will then be burned and become steam that will come out the exhaust as white smoke.
Possible car trouble: Head gasket developed some crack or rupture.
How to fix white smoke from exhaust of car
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.
Just a reminder, if you notice the white smoke from exhaust after you start the engine and just before the engine warmed up or before it reaches normal operating temperature do not worry because its normal and nothing wrong about your car.