A coolant or antifreeze when diluted is essential in the cooling process of a running car engine. It helps to maintain a favourable temperature for good performance. Due to it’s liquid nature, wear and tear in the parts conveying the coolant could break down and begin to leak, resulting in engine overheating. But you can get an initial warning before a possible overheating by the smell of the burning coolant so you can handle it before it leaves you and your car stranded by the road.

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https://www.spotdem.com/2021/01/03/what-does-a-coolant-leak-smells-like/