What is a freeze plug?

A freeze plug, also known as an expansion plug or core plug, is a small metal plug located in the engine block of a vehicle. Its main purpose is to prevent the engine block from cracking in extreme cold temperatures by allowing space for the coolant in the engine to expand without causing damage.

Freeze plugs are typically made of steel or brass and are inserted into specially designed holes in the engine block during the manufacturing process. They are held in place by being slightly larger than the hole they are inserted into, and they can be easily removed and replaced if necessary.

If a freeze plug fails or is damaged, it can lead to coolant leaking from the engine block, which can cause overheating and potentially serious engine damage. Therefore, it is important to regularly inspect freeze plugs for signs of wear or damage and replace them if needed.

Overall, freeze plugs play a crucial role in the proper functioning of a vehicle's cooling system and should be maintained to ensure the engine operates efficiently and safely.