Answer: The radiator has one of the most important jobs for your engine; it is in charge of keeping the engine cool. The radiator holds the engine coolant (antifreeze), releases it into the engine, and then has to cool the antifreeze once it returns. If your radiator ever fails from a leak, a broken hose, or getting clogged, your engine is in serious trouble. If the radiator isn’t working, your engine will quickly overheat, your engine’s pistons will seize, and the engine will fail. This can also lead to further damage when the pistons seize. They can break and damage the cylinders in your engine. So, if your radiator isn’t working properly, your engine will, without a doubt, fail.