gurbling noise almost sounds like metal rubbing (not grinding)or water boiling but its definately not a coolant issue i just used that to describe the noise its really low piched i can barely hear it until i make a wide turn for instance turning into my drive way or a parking spot and then is when it then kind of turns into a grinding or really low screeching sound not extremely loud but loud enough to hear from inside the car i have observed that the serpentine belt tensioner is jumping a bit maybe a bad power steering pump? Alternator pulley? Could this noise be comming from lower in the engine Camshaft/Crankshaft? And btw it definately not a knocking sound more of metal rubbing on metal like the sound of a torque converter rubbing on the bellhousing thanks