There could be some air still in the system...Sometimes when the head gasket starts to go it will put a small amount of combustion into the system...Hard to detect at first...A good test to see if this is happening is when the engine is cold and you start it up, rev the engine up for 30 seconds and then shut it off..Open up the system, if their is pressure present then the gasket is leaking...Caution..Do not do this if engine is warm...
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