How do you change a blown head gasket on a 2003 Pontiac Aztec?

To change a blown head gasket on a 2003 Pontiac Aztek, first ensure the engine is cool and disconnect the battery. Remove the intake manifold, exhaust manifold, and cylinder head, taking care to label and keep track of all parts. Clean the surfaces thoroughly, install a new head gasket, and reassemble the engine in the reverse order, ensuring all torque specifications are followed. Finally, refill fluids, reconnect the battery, and start the engine to check for leaks.