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This is actually a pretty common problem with the LS.
The engine block water lines are higher in places than the thermostat. When the system is drained, a vent cap at the top of the engine block must be removed and the engine block filled from that location PRIOR to adding coolant to the rest of the system. This ensures all the air is out of the system. Thermostat replacement may make the problem worse by adding to the vapor lock condition.
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That seems to be a fairly common problem, I did a little more checking and it sounds like removing the temp sensor to purge air does the trick quite easily.
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That would be my first impression as well, but I knew of the air lock problems in the LS so I did a little checking and found that there are many many cases of this. It does'nt necessarily mean the engine is that hot, it is just the way it indicates with the air lock condition. . At temp the air bubble contains superheated steam and when that hits the sensor it thinks it's overheating. When the air bubble passes it goes back to normal. The LS has a more complicated than usual bleeding process. I am attempting to find you a good picture of the location, but I recommend having the bleed process done by a professional.
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No it shouldn't, once the air issue is resolved it seems to stay fixed as long as the system isn't opened back up. It is a design flaw in the system, and the fact that an elaborate bleeding procedure needs to be followed. I might not be able to get the graphic I want to send you until tomorrow morning. But I will send it then.
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Great, thanks. I'll get that info over to you first thing in the AM.
I know its confusing but I'm glad I could help you out. Let me know if you need anything else.
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I'm not the authority on this though, if you have that type of question the best thing to do would be ask a moderator or email@example.com.