How to Check Coolant Level?
3 Answers
Generally, the maximum level should not exceed the outer circular protrusion of the expansion tank, and the minimum level should not be lower than the marked "MIN" line. However, this minimum level is not an indication that the car cannot be used if the coolant is below this position; it is merely a warning sign. Below is relevant information about coolant: 1. Adding Coolant: Under normal circumstances, the car's coolant will not be depleted. Even in cars used for several years, the coolant level will only drop to the lower limit due to the evaporation of water in the coolant, but the antifreeze and cooling performance of the coolant will not decrease. Generally, as long as coolant is visible in the expansion tank, it means there is enough coolant and no need to add more. If addition is indeed necessary, do not exceed the upper limit, as the coolant may overflow when the engine temperature rises. 2. Replacing Coolant: Car coolants are colored, which serves as an indicator. For example, if this car's coolant is pink and the color becomes very faint, it indicates that the additives in the coolant are nearly depleted, and the coolant needs to be replaced. The same applies to coolants of other colors. When replacing, it is best to choose the same brand and model of coolant and have a professional mechanic perform the operation. System bleeding during replacement is crucial, as air in the system can cause the engine to overheat. 3. Function of the Radiator: The expansion tank filled with coolant plays a significant role in the proper functioning of the cooling system. Especially the radiator cap on top, which contains two valves: the steam valve and the intake valve. These valves maintain the correct pressure in the cooling system, raise the boiling point of the coolant, and prevent coolant loss. If an ordinary cap is used as a replacement, the engine may not only overheat, but the coolant may also deplete quickly.
Every time before I drive, I take a quick glance at the coolant level, especially before long trips on hot days. Make sure to do this when the engine is completely cooled down. Pop the hood and find a well-lit spot—there's a translucent plastic reservoir with MIN and MAX lines marked on the side. As long as the fluid level sits steadily between them, you're good. If it's low, top it up with pure coolant—the same color as what's already in there. Don't mix colors, or it might cause corrosion in the pipes. Also, don't forget to check the seal on the reservoir cap for signs of aging. If it's leaking, the coolant will disappear fast, and an overheated engine can cost you big—repairs can easily run into thousands. I make it a habit to check monthly, and while I'm at it, I inspect other fluids too. Keeping up with this routine helps prevent costly car troubles down the road.
If you're a beginner checking the coolant level, don't panic—I'll guide you step by step: Wait until the engine cools down before starting. After opening the hood, locate the reservoir with the coolant symbol, usually made of white or transparent plastic, with MIN and MAX level marks printed on the side. The ideal fluid level should be between these two lines. If it's too low, gently twist open the cap and add coolant up to the MAX line—always use a product that matches the color of your existing coolant, and never perform this when the engine is hot, as steam can spray out and burn your fingers. After topping up, securely tighten the cap. Check the coolant level every month or two, especially during seasonal changes, such as before winter, to ensure sufficient antifreeze protection. Remember to perform the entire process in a quiet environment to avoid distractions and mistakes.
