I'm still baffled at how a semi-enclosed system has this issue.
What, exactly, is a semi-enclosed cooling system? Open cooling systems as used in boats circulate outside water through the engine and then dump it to remove the heat. Closed sysems as used in everything else recirculate the same water through the engine and then a radiator or other heat exchanger. Semi-enclosed doesn't really make sense.
I'm talking about air being trapped in a semi-enclosed cooling system by the act of adding coolant to an overflow tank.
Why talk about an overflow tank in a discussion about a Solstice? We don't have overflow tanks, we have a surge tank.
LOL I don't know where the confusion is coming from.
GM has been using semi-enclosed cooling systems for over half a century. The overflow tank for example in my 1970 Buick does exactly what it is supposed to do, and this is where you add coolant, not the radiator. Adding coolant to the tank prevents cavitation, and also exciting things like a column of boiling green liquid possibly appearing like magic when you open the radiator cap.
In my old muscle car club, many times I patiently explained to fellow enthusiasts that they would prefer a jiggle valve in the thermostat, yes indeed they should actually run the car with a thermostat, they should use a fan shroud, the overflow tank etc. etc. despite the fairy tales and myths their uncles and older brothers told around the campfire.
I don't misunderstand any of this and I'm not asking for tips and tricks, but I appreciate the extension of advice; I simply haven't indicated I was looking for it. Like I said, what I do not understand is how this air-bubble-in-the-system issue is happening in a 21st century automobile using a very well understood semi-enclosed cooling system. There is either a technique being done wrong or a flaw in the system as designed.
Part of the confusion is coming from you talking about characteristics of a system that doesn't exist in the car under discussion. Another part is coming from you using terms that either don't exist or don't apply here. Again, why talk about things that have no meaning in this discussion? You can't add coolant to an overflow tank because we don't have them. You also don't add it to the radiator, of course, but you do add it to the surge tank that shares characteristics with both. Its level changes like an overflow tank, but it is under pressure like a radiator.
Respectfully, check that sir. The overflow tank is NOT at radiator pressure in my example.
You will please bear in mind that the paragraph which you have quoted from is not in reference to a Solstice. Snipping out a sentence in reference to my old car example sort of skews things.
Again, what was the point of the reference to a technology that doesn't exist n this car? You really are only adding needless confusion.
Not from my example you don't. You've missed where it was an old car in my example.
While I should not have typed "your" as that was me creating confusion, my entire paragraph was using an example other than a Solstice. I also doubt green coolant is in your kappa.
Yes, mis-typing, and using the wrong words can create some serious problems when using a communications medium that relies solely on words.
I also wish we could regard my question, instead of simply seeing a chance to correct somebody.
I actually haven't found an actual question in your posts, but there is the one implied by your statement of being confused, so here goes with that:
Because of the TSB directing installation of check valves into two hoses to combat the problems of excessive temperature and limited HVAC heat, it can be assumed that the problem is reverse flow in those lines. The lines are intended to vent air bubbles from the tops of the radiator and the head into the surge tank, but examination of the tank reveals that their connection at the top of that tank could result in air being pulled from the top of the tank if the conditions exist for there to be lower pressure in the radiator or head than there is in the tank. Clearly that condition was not anticipated by the designers, or discovered in the pre-production testing, but has since been confirmed to exist in some cases. Hence the addition of check valves.