If a lower radiator hose suddenly leaked while on the freeway, and the sudden loss of coolant caused it to overheat, would that blow a head gasket? In other words does it matter if there is any coolant pressure left or not when it over heats as to whether or not a head gasket leak is likely? In my sons case he says it overheated and died literally in just a few seconds, so I don't see how the head gasket or head could get damaged that quickly? It is 96 Vulcan 3.0 L. The battery died just before or just after the coolant leak (+/- a few days), and now its throwing misfire codes, mostly Cyl #1, and no other codes, with a rough idle.