Why do freeze plugs fail?

Freeze plugs, also known as core plugs, can fail due to several factors, including corrosion from coolant chemicals, rust from moisture, or mechanical stress from engine vibrations. Extreme temperature fluctuations can also cause them to crack or pop out if the coolant freezes and expands. Additionally, poor installation or pre-existing weaknesses in the engine block can contribute to their failure. Regular maintenance and using the right coolant can help prolong their lifespan.