will the antifreeze overflow tank be empty when in limp mode and refill itself

what a scam. If they dumped out the antifreeze they should have asked you if it was ok, secondly, it seems odd that a ship would dink with it, dump out the coolant then charge you to put it back it with their product. I'd be ALL over that with better business bureau. If the coolant doesn't need flushing, reuse it.. nothing wrong with that ( of course they will tell you it's the wrong color type for that model, year and blah blah. Anything for a buck

Brand new and you're having problems ? Not a good sign . G.M. - garbage machine .

Yeah, not a good start. Not going back to that dealer anymore. Thank for the input everyone

apparently I'm talking too much to get no points out of anything. Good to know GM

Great advice from all. Thank you

Any engine that uses coolant and is overheating will tend to push antifreeze into the overflow tank WHEN ITS HOT, and when its cool it SHOULD pull the antifreeze back into the radiator. If there uis notenough coolant in teh system that is possibly exactly what is happenning.

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Great. I didn’t know that. So when I checked the overflow tank (when the vehicle was in limp mode due to overheating) and it was empty, it is possible that when the overheating condition was resolved, the antifreeze returned to the overflow tank. Thanks again.