I don't know much about trucks but have a few questions about the cause & effect of a blown headgasket.
#1 Could a gasket blow first, THEN the car overheat? #2 Does a truck ALWAYS overheat FIRST, & would the overheating be the CAUSE of a blown headgasket? #3 Could a head gasket blow just upon starting a vehicle & then it overheat in a matter of a few minutes? #4 Would a faulty water pump potentially be the cause of a blown head gasket?
1. Yes and vise versa
2. A. No b. It can be one cause
3. Yes, once the head gasket starts to fail its only a matter of time before it goes completely
4. Yes, it can be one cause, if you loose the water pump then you loose coolant circulation in the engine.