How to Completely Replace Antifreeze?
2 Answers
Method for completely replacing antifreeze: 1. Unscrew the radiator cap, open the radiator drain valve (usually located at the bottom of the car), and drain the antifreeze; 2. Clean the cooling system by continuously injecting clean water into the engine cooling system. During the flushing process, keep the engine idling to maintain the circulation of clean water inside until clear water flows out from the radiator; 3. Stop injecting clean water, wait for the water to drain completely, then close the drain valve; 4. Fill with new antifreeze until the liquid level is between the max and min marks; 5. Close the cap, start the car, and let the engine idle for two to three minutes. The cooling system will expel internal air, causing the antifreeze level to drop slightly. At this point, top up the antifreeze again.
Changing the coolant isn't too complicated, I've done it myself several times. Make sure the car engine is completely cooled for at least two hours, otherwise there's a risk of burns. Wear gloves and goggles for protection. Then locate the drain screw or valve at the bottom of the radiator, prepare a large bucket to catch the old fluid, and loosen the screw to drain the old coolant. Dispose of the old fluid properly—don't pour it randomly; take it to a professional recycling station. Flushing the system is crucial—run clean water through the radiator five or six times until clear water comes out. If there's residue, adding a cleaning agent is better to ensure thorough cleaning. Drain the water hose and add new coolant—the type must match the manual; don't buy random mixes. Start the engine to let the temperature rise, checking the radiator cap midway to ensure it's warm, properly vented, and free of air bubbles. Finally, top up the overflow tank to the standard line and check the fluid level after a few days to ensure no leaks. Thorough flushing prevents scaling and rust, extending the system's lifespan—it takes about an hour and saves money while giving peace of mind, but don't rush—details matter.
