What will happen if a freeze plug go out?

If a freeze plug fails, coolant can leak from the engine block, potentially leading to overheating and engine damage. The loss of coolant may also cause the engine to run inefficiently or misfire. Additionally, if the leak is significant, it could lead to more severe issues, such as engine corrosion or a complete engine failure if not addressed promptly. It's important to replace a faulty freeze plug to maintain the engine's integrity and performance.