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We are still trying to figure why exactly all the coolant came out. The best hypothesis is an airlock developed in the system and forced the coolant out.
That still leaves us wondering why the airlock started in the first place.
Once piece of the puzzle has been figured out, which sadly creates a new question. The bottle failed due to exhaust heat. We were seeing EGTs close to the yellow\warning zone before the failure. The portion of the bottle that melted was the portion closest to the exhaust system.
This also brings up the question of why the EGTs were higher than normal....