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Yes, engine coolant and antifreeze are the same thing. When a fluid helps maintain engine temperature to prevent overheating, the fluid is often referred to as coolant. When it protects the engine from freezing at low temperatures, it is called antifreeze. However, the fluid itself is the same.
The full name of antifreeze should be called antifreeze coolant, which means coolant with antifreeze function. Antifreeze can prevent the coolant from freezing and cracking the radiator and freezing the engine cylinder block or head during cold winter parking. Many people think that antifreeze is only used in winter, but in fact, antifreeze is used all year round.