So I have the 2009 Chevy Silverado 1500 5.3L. Its at 178,000 miles. I started having some coolant leaks, ended up getting all new hoses, new radiator, thermostat, water pump. Ran okay for a little bit, then started overheating again. Kept getting air in the system (mechanic said he saw no signs of a blown head gaske), I used the Blue Devil engine block sealer (was getting some white smoke at cold startup too, maybe unrelated). Air stopped getting in the system and the truck ran great for a couple weeks. The over heating came back, but no air in the system. It just runs really hot (normal is 210, its running about 230-240 with heat on full blast).
The overheating comes with higher speeds, 30 mph and above, then when idling it goes back down. Sounded like a clogged radiator to me (from the blue devil) I flushed it and put a new thermostat in, but still same problems. Also there seems to be a lot of pressure in the hoses. I can actually hear a very small hiss coming from the coolant reservoir cap. I am just stumped, any advise would be greatly appreciated!
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