Why is the antifreeze level decreasing rapidly?

[VonJuliette]

There may be several reasons for the rapid decrease in antifreeze: 1. Poorly designed cooling system: This generally doesn't occur in mature vehicle models, especially new cars. 2. Poor circulation causing fast consumption: Have a professional mechanic inspect it. Note that when adding coolant, do so after the engine has cooled down. During the process, start the engine and gently press the accelerator to expel air from the system. Add coolant slowly to ensure proper filling. If necessary, follow the manual's instructions to bleed the cooling system. 3. Leakage: Usually, visible traces can be found at leakage points. 4. Coolant entering and burning in the cylinders or entering the oil pan: In mild cases, there may be no water in the oil pan, but some operational issues might occur (check by removing spark plugs for comparison). In severe cases, water may be present in the oil pan (emulsified oil), causing engine instability. Don't immediately assume it's a cylinder head gasket issue - a damaged intake manifold gasket can also cause coolant to enter the cylinders, as some engines have water passages in the intake manifold. If water burning is severe, the engine's exhaust pipe will discharge water along with white smoke.