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Originally Posted by huck369
Definitely replace the O-ring Chris....it cost's 50 cents....and takes 15 minutes....
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You should do this first, all thing considered. Air in the system does create a strange noises for sure, as I can vouch for from experience. In my case it sounded like the equivalent of water hammer, which makes sense.
There is unlikely to be any visible evidence of the O ring leaking, as the problem is the entry of air not a loss of fluid. The effect is understandable as air can be compressed, where as fluid can not.