I replaced this pump on this car last week and found it still emits a loud groan under load. After numerous bleed procedures it still continues. The original pump didn't make this noise. I replaced it(16years old) because of a worn shaft bearing. I'm letting the owner drive the car for a week or so hoping it corrects itself. Do you think I have a bad rebuild? or what? Also I noticed the idler tensioner is on the minimum mark(arrow) of tension. The serpentine belt is relatively new. Could a worn tensioner cause this pump noise? Then again it wasn't there on the old pump. Any tips will be appreciated.