Where to Add Coolant for the Phaeton?
2 Answers
The coolant for the Phaeton is added into the auxiliary tank (also called the expansion tank), which is located in the engine compartment. Method for replacing the coolant: Before completely replacing the coolant, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with a special focus on the five-way water pipe. The five-way pipe is named for its five connections to various parts, and the coolant is distributed to different sections of the car after flowing through it. If there are signs of coolant leakage in this area, replace the water pipe or resecure the connections as needed. Drain the old coolant, then flush the liquid channels with clean water. Add clean water to the coolant reservoir and continue filling it until water flows continuously through the engine cooling system. Then, start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the water flowing out will have a faint pink tint. Keep adding clean water until clear water flows out. Remember to disconnect the heater hose to drain the water from the heater core. About an hour after draining, add the new coolant through the radiator hose to allow it to flow quickly into the radiator. Then, add another batch 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. Top up the coolant to the "MAXT" mark on the reservoir.
As a seasoned Phaeton driver, I always emphasize maintenance details. The coolant is added through the expansion tank. Open the engine hood, and you'll usually find a translucent plastic reservoir towards the rear labeled 'COOLANT' or coolant. Unscrew the cap carefully. Always wait until the car is completely cooled before adding coolant, as high-pressure steam from a hot engine is dangerous. Pour in the recommended antifreeze, such as the Phaeton's original G13 blue formula, and avoid mixing with other colors to prevent chemical reactions. Keep the fluid level between the MIN and MAX marks, never overfilling to prevent leaks. I check it every season, especially crucial during winter-summer transitions—top it up if low to ensure the engine stays protected from freezing or overheating. If the coolant level drops rapidly, it might indicate a hose seal issue requiring professional inspection.
