A very small amount of white smoke at startup is normal and is nothing more than condensation in the winter. However combined with a loss of coolant with no apparent leak, overheating, white foamy substance on the underside of the oil fill cap, or overfull oil level, means you have a blown head gasket and or cracked head.
condensation
It depends from where it emitting it. White smoke could be steam if from the front - check radiator White smoke from underneath could be transmission fluid White somke from tailpipe could mean burning oil.
possible blown head gasket. I don't get white smoke from my exhaust! is it from yours? If it is just after you start your car it is normal.
a blow piston or a head gasket in your engine
White smoke in the exhaust means water is being burned in the engine. A small puff of white smoke the first time you start a car in the morning is normal. Water condenses in the intake, and engine and when you firsts start the engine it burns off producing a puff of white smoke. It is nothing to concern yourself with unless the car is constantly blowing white smoke.
white smoke can be either your car overheating, or smoke from an electrical issue
White smoke is coolant burning off. You have a coolant leak or the engine is overheating. Have this looked at by a professional ASAP, and stop driving the car.
piston rings going bad oil leaking around to top of piston so when you start the oil will burn white
If you are a mechanic you should know the procedure.
White smoke is a symptom of coolant entering the combustion chamber. You more then likely have a blown head gasket. STOP driving this car until you can have this repaired or you will destroy the engine.
Coolant entering the combustion chamber. More than likely caused by a blown head gasket. STOP driving this car until you have this repaired or serious engine damage will occur.
White smoke coming from the engine can mean many different things. One such thing is that your car may have a blown head gasket or that oil is burning in the engine.