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Do you by chance have a rear heater? If so, it takes forever to get bubbles out of the system. It took mine about two months. I followed the FSM recommendations but it did not help. Finally, just moderated the driving until it finally coughed up all the bubbles over about 2 months. Keep an eye on the overflow and make sure it never gets too low again.
Craig



All great ideas. Thanks. With regard to the rear heat, was you car overheating too? And under what conditions? It never occurred to me to turn on the rear heat to try to purge air.