Well, I guess I'm a bit ahead of you. Replaced the heat sensor which activates the fans. I replaced the thermostat twice, replaced the water pump, replaced the valves & surfaced the heads because the #4 cylinder was down to 85psi dry test. no water in the oil & was told it was likely venting into the water jacket. Valves were iffy & truck has 200k+. Thinking the head gasket was the issue & everything was opened up, might as well while we're here & I don't want to come back for a while. none of these solved my problem. Still overheated with in one tenth of a mile. Had the radiator tested & was told it was 85% good. So what else are you gonna do? Dropped in a new Radiator. Still overheating. I'm in over $2300. My buddy comes down from his off-grid mountain homestead & pulls the coolant reservoir cap and shows me that the lower "O ring" is chipped. explains that it is compromising the atmosphere so that the boiling point is lower & therefore pushing coolant out the overflow while driving. This explains why we never saw any coolant leaks while parked. At O'Reilly's it cost $11.
That was in January & here we are in May & the truck is overheating again with the reservoir low. Will l be paying too much by ordering it from factory?........
I actually was hoping to find out what the operating temps are for the cooling fans but thanks to your question I will opt for the new cap. After all, it did work for a while.....
But your question was about self burping. I would not count on it but welcome to Chevy Mystery Theater. Mine sat for months before it got running again, but then it was running & the coolant is going somewhere... Please let us know if you find resolution.
