How many liters of coolant does a Mercedes C need to add?
2 Answers
Mercedes C needs to add 4 to 4.5L of coolant, and you can prepare 6L, storing the excess for replenishment when the coolant is depleted. Coolant is a type of cooling liquid containing special additives, mainly used in liquid-cooled engine cooling systems. It has excellent properties such as preventing freezing in winter, boiling in summer, and resisting scale and corrosion throughout the year. How to replace coolant: Before completely replacing the coolant, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with a focus on the five-way hose. The coolant is distributed to different parts of the car after flowing through the five-way hose to perform its function. If there is any leakage of coolant in this part, replace the hose or re-secure the connection as needed. Drain the old coolant and then flush the liquid channels with clean water. Add clean water to the coolant reservoir, then continuously inject water into the reservoir to allow it to flow through the engine cooling system. Start the engine and let it idle for 3 to 5 minutes to circulate the water. The water initially flowing out from the reservoir will be slightly pinkish. Continue adding clean water until the outflow is clear. Note: Do not forget to remove the heater hose and drain the water from the heater core. After draining for about an hour, add the new coolant through the radiator hose. Then add another bucket of coolant to the coolant reservoir until it is nearly full. Start the engine and let it run for about 10 minutes. At this point, the coolant level will drop slightly as some air is expelled from the cooling system. Add more coolant until it reaches the "MAXT" mark on the reservoir.
I've been driving a Mercedes-Benz C-Class for several years, and each time I change the coolant, it requires about 7-9 liters, depending on the model year. Newer models might need a bit more, while older ones may require less. I remember the last time I did a DIY coolant change—I first let the engine cool down, then opened the radiator cap and slowly poured in the coolant. Avoid pouring too much at once to prevent spills. Coolant isn't just for preventing freezing in winter; it also helps dissipate heat in summer. Never use plain water as a substitute, as it can cause engine rust and corrosion. It's recommended to replace the coolant every two years and check that the level is between the MIN and MAX marks. Levels that are too high or too low can affect cooling efficiency. If you add too little, the engine temperature can spike easily. Always take a moment to check before heading out—safety first.
