I just got a chance to look at this post. How well is your fan working? Have you recently changed it? Look at the clutch on the fan and spin the fan by hand with the engine off if it spins freely with little resistance your fan clutch probably bit the dust and is not pulling enough air through the radiator. The shrouding around it helps direct the airflow and allows it to pull air through the radiator fins properly. May have already caused more problems with the head gaskets but you still need to find the root cause.
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well I think what started it all is when my water pump went out 30-45 minutes from the house and I kinda babied it back then my radiator cracked bout an hour from the house which I'm sure didn't help things to much. But the fan is good it takes a little bit of oomph to move it so the clutch is still good. I put 15,000 miles on this truck since November and this is the first trouble I've had from it
