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The Ford Fusion from 2009 uses a specific type of yellow antifreeze with a coolant capacity of 9.7 quarts. To maintain optimal performance, it's advised to flush and replace the antifreeze every 50,000 miles. As time passes, coolant can become more acidic, losing its ability to prevent rust and corrosion. Corrosion can harm various parts of the cooling system, like the radiator, water pump, thermostat, radiator cap, hoses, and can even affect the vehicle's heater system. If left unchecked, this corrosion can lead to engine overheating. Old coolant may contain dirt and rust particles that could block the radiator or heater core.
The Ford Fusion 2009 model requires the yellow 100,000 mile coolant for optimal performance.