Here's how it happens:
* Head Gasket Blowout: The most common cause. A blown head gasket creates a pathway between the coolant passages in the engine block and the combustion chambers. Pressure from the cooling system or combustion pushes coolant into the cylinders.
* Cracked Cylinder Head or Block: A crack in the cylinder head or engine block can also allow coolant to mix with the engine oil or enter the combustion chambers. This is less common than a blown head gasket but equally serious.
* Faulty Coolant Passage: Less likely, but a damaged or corroded part of the coolant passage system could create a leak into the cylinders.
* Improper Repair: In some cases, a previous repair related to the cooling system might not have been done correctly, leading to a leak into the combustion chamber.
It's crucial to diagnose the exact problem immediately. Running an engine with coolant in the cylinders can cause severe damage, including:
* Damaged Piston Rings: The coolant can interfere with lubrication and cause piston rings to stick or break.
* Internal Engine Damage: The coolant can cause corrosion and damage to internal engine components.
* Catalytic Converter Damage: Coolant in the exhaust can damage the catalytic converter.
If you suspect antifreeze in your 2005 Freestar's engine, have it professionally diagnosed and repaired as soon as possible to prevent further, more costly damage. Don't attempt to drive the vehicle extensively until the issue is resolved.
