I bet the blue/green you are talking about is oxidation from the copper in the heater core. Be sure and get it all cleaned out while you have your system apart as its probably pretty abrasive. I doubt it has anything to do with your noisy pump, but it'll cause extra wear&tear on everything. Also dont use any petroleum based products (vaseline) on your orings, it will cause them to degrade. One final thing, when you replace the tubing on your intake side, try to get something thick walled, I've seen some collapsed flat from the suction 8/
peace.
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