* Head Gasket Failure: This is the most common cause. A blown head gasket allows coolant to mix with combustion gases, resulting in white, often sweet-smelling smoke.
* Cracked Cylinder Head: Similar to a blown head gasket, a crack in the cylinder head allows coolant to enter the combustion chamber.
* Cracked Engine Block: Less common than a cracked head, but a crack in the engine block can also lead to coolant entering the combustion chamber.
* Warped Cylinder Head: A warped cylinder head can prevent a proper seal between the head and the block, allowing coolant to leak.
* Coolant Leak into the Intake Manifold: While not directly in the combustion chamber, a leak into the intake manifold can introduce coolant into the intake air and result in white smoke.
It's crucial to distinguish white smoke from other types of smoke:
* Blue smoke: Usually indicates burning oil.
* Black smoke: Typically signifies a rich fuel mixture (too much fuel).
If you're seeing white smoke from your warm engine, DO NOT continue driving. Driving with coolant in the combustion chamber can cause significant engine damage. Have it checked by a qualified mechanic immediately to diagnose the problem and prevent further damage.
