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I had coolant bubbles in a fresh rebuild was those damn rotary aviation o-rings. Had the motor pulled back apart and oem's put in and all was fine. When I had the bubbles the car would start up and run fine the issue was it may run fine for a 2 hour drive plus and back home but sooner or later the bubbles pushed enough coolant into my over flow tank leaving air around the therostat. So the next time I started it up it would not open and soon over heat (or start to). I tried everyhing and ther was never ant sign of colant in the exhaust. It was always getting pushed into the overflow tank that would drip out when I went for a drive. Never saw any in the garage. Best of luck to you. BTW what oring brand are you using? not the round aviations?
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