How do you change the antifreeze on a Peugeot 406?

To change the antifreeze on a Peugeot 406, start by ensuring the engine is cool and then open the radiator cap. Place a container beneath the radiator, remove the drain plug, and let the old antifreeze drain out completely. Flush the system with water if desired, then close the drain plug and refill the radiator with a suitable mix of antifreeze and water, ensuring to bleed any air from the system by running the engine with the heater on until it reaches operating temperature. Finally, check for leaks and ensure the coolant level is correct.