Why Can't I Find the Leak When the Antifreeze Is Always Low?

[MaggieDella]

Antifreeze is always low but the leak can't be found, which indicates an internal leakage phenomenon. This refers to the antifreeze leaking into the engine internally, causing a continuous decrease in antifreeze levels without any visible external leak points. The reasons for internal leakage include: 1. Damage to the cylinder head gasket, allowing coolant to enter the oil passages or combustion chamber; 2. Sand holes or fine cracks in the cylinder wall, leading to antifreeze entering the combustion chamber; 3. Damage to the oil or transmission oil cooler; 4. Coolant seeping into the intake tract and flowing into the combustion chamber to burn. The full name of antifreeze is antifreeze coolant, meaning it is a coolant with antifreeze properties. It prevents the coolant from freezing in cold winter conditions when the vehicle is parked, which could otherwise cause the radiator to burst due to expansion or damage the engine cylinder block or head due to freezing.