How to Properly Replace Engine Coolant?
3 Answers
Before replacing the coolant, always wait for 10 minutes after the engine is turned off. The coolant temperature remains extremely high after driving and can cause burns. Inspect the hoses for any signs of leakage or cracks, and check the five-way water pipe. If coolant leakage is observed, replace the hose or resecure the connection as needed. Use a jack to lift the vehicle. Loosen the screw at the bottom of the radiator with a wrench and place a waste fluid container to catch the old coolant. Cover the expansion tank cap with a thick towel and slowly loosen it until all pressure is released, then completely remove the cap. Use a compressed air blow gun or a thick towel to pressurize the expansion tank filler neck, ensuring maximum removal of old coolant from the engine block. Add new coolant up to the maximum fill line.
I just learned how to change the coolant, so I'll share my experience. The key point is that the car engine must be completely cooled – I waited overnight before starting the operation last time. First, check the radiator cap or overflow tank, open it gently to drain the old fluid. Usually, you just need to locate and unscrew the drain valve at the bottom of the car. Then I flushed the system with clean water several times to remove residual dirt. When adding new coolant, make sure to choose the correct type – my car uses the green one, and don't mix it with the old type. I bought the 50/50 pre-mixed variety. After filling, start the engine to circulate the coolant and remove air bubbles, then finally check if the fluid level is normal. Changing coolant every two years protects the engine's cooling system and extends its lifespan. Don't pour the old coolant randomly – I took mine to a professional recycling point for safe and eco-friendly disposal.
Properly changing the coolant requires careful attention, and I emphasize not to rush. Wait until the engine has completely cooled down before starting to avoid burns. Locate the drain valve to remove the old fluid, then flush the system internally—using distilled water can help prevent corrosion. When adding new coolant, ensure the specifications match your vehicle model. Do not mix different colors, as this can cause reactions. Start the engine to circulate the system and check for leaks. Replace the coolant every 50,000 kilometers or two years to prevent freezing or overheating. Different types of coolant, such as organic acid or silicate-based, have their pros and cons—choosing the right one saves money and ensures peace of mind. Dispose of the old fluid at a repair or recycling facility to avoid environmental pollution. The process is straightforward but demands caution—if unsure, consult the manual rather than taking risks.
