What may happen to engine coolant if it overheats?

When engine coolant overheats, it can reach its boiling point, causing it to boil and generate steam. This increase in temperature leads to elevated pressure within the cooling system, potentially causing components like hoses or the radiator to fail under pressure. As the coolant boils, it is no longer efficient at absorbing and dissipating heat, which can exacerbate the overheating issue and lead to engine damage. This process highlights the critical need for a properly functioning cooling system that can maintain appropriate temperatures, check coolant levels regularly, and ensure no air pockets are present that could hinder coolant flow.