Another radiator burp question... [Archive] - Toyota MR2 Message Board

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I took the car to an auto center that has a flushing machine and they tap into the front radiator hose. They then pump 5 gallons through the system, you see all the old stuff come out and when new antifreeze starts coming out, they are finished. They let it run for a few minutes and it did not need a top-off. They claim only a very minimal, if any, air gets into the system and it does not need to be burped. Is that correct? Next newbie question, if the system DID have air in it, would that