when i received the car - it has the orange coolant...no additives that i know and no work on it...other than that, it runs very well...every now and then it hesitates like it needs power when giving it gas....bubbling is only after its been running around the area....when it idles at the house, hardly any bubbling...
UPDATE - false alarm...it was normal...had one of my shady tree ASE qualified retired mechanics work on it with me...wasnt use to a car with coolant bubbling visible in the tank...drained, flushed and new coolant - NO ISSUES!!!!!