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

Your answer is correct because anti-freeze in the coolant system serves two main purposes in German traffic and vehicle regulations. First, it protects against corrosion by preventing rust and damage inside the engine and cooling system components, which helps maintain the system's integrity and longevity. Second, it prevents the coolant from freezing in cold temperatures, ensuring the engine stays properly cooled and does not suffer damage from ice formation. The third option is incorrect because anti-freeze does not cause corrosion; instead, it protects against it throughout all seasons. Understanding these functions helps ensure the reliable operation of your vehicle’s cooling system year-round.