Car coolant does not necessarily need to be replaced at a 4S shop or an outside garage. You can replace it yourself. Method for replacing coolant: Before completely replacing the coolant, conduct a thorough inspection to check for any signs of leakage or cracks in the pipelines. Pay special attention to the five-way hose, which gets its name from having five connecting interfaces to various parts. The coolant flows through the five-way hose and is then distributed to different parts of the car to function. If there is any leakage of coolant in this section, replace the hose or re-secure the interface as needed. Drain the old coolant, then flush the liquid channels with clean water. Add clean water to the coolant reservoir and continue pouring water into the reservoir to allow it to flow continuously through the engine cooling system. Then, start the engine and let it idle for 3 to 5 minutes to circulate the water. The water initially draining from the reservoir will have a faint pink tint. Continue adding clean water until clear water flows out. Remember 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—this allows the coolant to flow into the radiator quickly. Then, add another bottle of coolant to the reservoir until it is nearly full. Start the engine and let it run for about 10 minutes. As some air is expelled from the cooling system, the coolant level will drop. Add more coolant until it reaches the "MAXT" mark on the reservoir.
