A blown head gasket is a serious engine problem that can lead to catastrophic engine failure. It occurs when the seal between the cylinder head and the engine block fails, allowing coolant and oil to leak into the combustion chambers. This can cause a variety of problems, including overheating, loss of power, and even engine seizure.
There are a number of ways to check for a blown head gasket. One common method is to look for signs of coolant or oil leaking from the engine. Another method is to use a compression tester to check the compression in each cylinder. If the compression is low in one or more cylinders, it could be a sign of a blown head gasket.