How To Check for Head Gasket Leaks

In this video Greg Macke - Your Car Angel - shows how to check a car for head gasket leaks. He inspects a Subaru 2.5 engine and finds that it has coolant leaking into the combustion chamber. The boxer engine is known for head gasket failure and should be part of the used car inspection when buying a used car. He is using the NAPA block tester for this test.