Can water from or antifreeze cooling system get into cylinders?

Yes, it is possible for water or antifreeze from the cooling system to get into the cylinders of an internal combustion engine. This can happen when there is a leak in the head gasket, which is a seal between the cylinder head and the engine block. When this happens, coolant can seep into the cylinders and mix with the air and fuel mixture, causing it to become too rich and preventing it from igniting properly. This can result in a loss of power, engine knocking, and eventually, engine damage. It is important to have any leaks in the cooling system repaired as soon as possible to prevent this from happening.