Check the transparent coolant tank while the engine is cooling down. If the liquid level remains between the "F" and "L" marking lines of the storage tank, it meets the requirements. If the liquid level is at or below the "L" line, coolant needs to be added to make the liquid level reach the "F" line. After adding coolant, if the coolant level drops in a short period of time, it may indicate a leak. It is necessary to visually inspect the radiator, hoses, engine coolant filling cap, radiator and drain valve, and water pump to see if there is any water flowing out. If no leakage is found, the car needs to be driven to a designated service station for further testing. It should be noted that to prevent burns, do not remove the radiator cap when the engine is still hot.