To what level should the coolant be filled?

[IsaacLee]

The coolant should be filled to the level between the upper mark MAX and the lower mark MIN. If overfilled, the coolant may overflow from the pressure relief valve due to thermal expansion and contraction. There is usually an overflow reservoir for excess coolant storage, so exceeding the mark slightly is not a big issue. However, it is still better to fill it to the appropriate level since the coolant will naturally evaporate. If the coolant level is found below the MIN mark on the radiator, it is necessary to promptly replenish it with the same color, brand, and model of coolant. In emergency situations where coolant is temporarily unavailable, purified water can be used as a substitute. However, it is recommended to promptly check the specific reason for the coolant loss and replenish or replace the coolant as soon as possible to avoid unnecessary damage to the engine caused by insufficient coolant.

[Chris]

I find the expansion tank in the engine bay is the most suitable place to add coolant. It's a transparent plastic tank with Min and Max level markings—always add between these lines. Having driven for over a decade, I always wait a few minutes for the engine to cool before topping up for safety. Just pop the hood to locate it. Never overfill to the brim, as it may cause coolant leaks or excessive system pressure, nor add too little to risk engine overheating. Regularly check for sediment or cracks at the tank base, which indicate potential radiator clogging or aging. Monitor the mixture ratio in summer and winter—low concentration risks boiling/freezing; a refractometer test is ideal. If the tank is empty, first inspect for leaks or water pump issues before refilling.

[LaSpencer]

I felt a bit nervous the first time I added coolant by myself. Later, I learned that the transparent reservoir is located at the corner of the engine, with clear Min and Max level marks—never exceed these lines. A common mistake beginners make is opening the cap while the engine is hot, risking burns, so always wait for the car to cool down. When adding coolant, match the type label and avoid mixing different colors, as this can corrode the system. My habit is to add a little coolant, then shake the reservoir to observe the level, keeping it ideally in the middle of the marks. This ensures proper engine cooling while minimizing foam risks. Additionally, during seasonal oil changes in spring and autumn, I check the coolant concentration and reservoir condition as a preventive measure, saving hassle. Once it becomes routine, maintaining the car becomes effortless.

[Elliott]

The coolant is added to the expansion tank located near the engine. The tank is usually a translucent plastic container marked with Min and Max lines, and the fluid level should be between these two lines. Having driven vintage cars for many years, I know that adding too much can cause the tank cap to pop open and bubble, leading to waste, while adding too little can cause the water temperature to soar and create problems. Before adding, make sure the engine is turned off and cooled for at least ten minutes. Slowly pour in the correct type of antifreeze without rushing. I recommend buying a fluid level gauge to check regularly. If the level keeps dropping, inspect the water pump seal or pipes for leaks. Maintaining the proper fluid level is a crucial step in preventing engine overheating.