What can cause damage to an engine's cooling system in winter?

Insufficient frost protection can cause serious damage to the engine's cooling system in winter because the coolant may freeze at low temperatures. When coolant freezes, it expands and can crack engine components like the radiator, hoses, and the engine block itself. This is why it is important to use antifreeze or a properly mixed coolant with frost protection to ensure the cooling system works effectively even in cold weather. Regular maintenance and checking the coolant concentration help prevent such damage.