Discovering coolant residue on top of the degas bottle is a dead giveaway that a 6.0L Power Stroke has blown a head gasket. Once compression is allowed to sneak past the gasket, the coolant system becomes pressurized, and the weakest link in the chain is the purging of the 16 psi-rated degas bottle cap. Chad Flynn of Flynn’s Shop got started by draining the coolant system and detaching the degas bottle. He then removed the front grille. Why does Flynn pull the grille? Because he knows that the two-day job calls for a lot of leaning over the front of the Super Duty, and this rules out the potential for scratching it.