What are the functions of anti-freeze in the coolant system?

Your answer is correct as it includes both important functions of anti-freeze in the coolant system. Anti-freeze protects against corrosion, which is crucial for maintaining the integrity of the cooling system parts over time. Additionally, it protects the cooling system against freezing, ensuring that the engine operates efficiently in cold temperatures. These functions are important because they contribute to the overall safety and reliability of a vehicle, which are emphasized in German traffic regulations. Proper maintenance of the coolant system is vital to prevent breakdowns and ensure compliance with vehicle safety standards.