White smoke from the exhaust indicates you have a blown head gasket or cracked head. Stop driving the car until this is repaired or you will do serious damage to the engine.
Head gasket is leaking
Maybe check both electical fans between radiator and engine.
it would cause overheating but the smoke is probally coming from some sort of water or antifreeze in combustion chamber
Overheating or coolant leak.
Instantly. If someone is telling you otherwise, they're blowing smoke.
Most likely your thermostat has gone bad. Cheap and easy repair. If its white smoke coming out the pipe it may be a head gasket,,the smoke is acutally steam vaporating out the chamber thru the tailpipe...if it starts a second then stops you may have just gotten away from a going bad engine and itsw the thermostat..have it checked..
heater core is shot and you have to get a new one
Your oil is probably leaking. If the car is old, then it's likely to be scrap!
The thermostat needs replacing any time you service the cooling system. You should also replace it if the engine is overheating, and you suspect it is defective. A blown head gasket will exhibit, certain symptoms. Coolant in the oil, white smoke from the tailpipe, overheating, air bubbles coming from the radiator, missing on one or more cylinders, a brown looking foam on the underside of the oil cap. A compression test will help to verify this.
The car could be overheating or have a coolant leak.
Could be the water pump is not working properly.
Look at your thermometer. Or you can check for steam or smoke coming from the engine. Look and see how much coolant you have. And basically you can tell if it is overheating just by putting your hand by the engine after you drive it for a while. if it is abnormally hot, pretty good chance it is overheating.