Why is the antifreeze coolant reservoir in you car always empty even when you just re filled it lately and then you hear like it's boiling and evaporating when you turn the car off?

If the antifreeze coolant reservoir in your car is always empty despite recent refills, it may indicate a leak in the cooling system, such as a faulty hose, radiator, or water pump. The boiling and evaporating sound after turning off the engine could be a result of overheating, which occurs when the coolant isn't circulating properly. This can lead to excessive pressure in the system, causing coolant to escape. It's crucial to address these issues promptly to prevent engine damage.