Final answer:
Coolant leaks can be dangerous because they can cause systems to overheat and potentially fail, resulting in severe consequences.
Step-by-step explanation:
Coolant leaks can be dangerous because they can lead to a loss of coolant in a system. This can cause the system to overheat and potentially fail, which can have severe consequences. For example, in a car radiator, if the coolant leaks or freezes, it can cause the engine to overheat and even lead to the engine block cracking. Similarly, in a nuclear reactor, a loss of coolant can result in the reactors overheating, leading to a potential meltdown.