My truck was running norm. all week no prob. then this morning on my way to work the temp was reading around 235. One day it fine the next day its overheating. And this was at 6am in "cooler" weather. Anyways anyone have any sugg. what it might be. already checked the coolent it was fine. I know there is a list of thing that might be causing it to overheat but any common issues? Thank guys-

 

First guess would be the thermostat.

 

me too, check to see if the thermostat stuck closed, happened on my 87 305 tbi, just hit the water neck a couple of times with a wrench and it opened