Have an 81Z with A/C. When I get the RPM's over 2K I get a squeak like a loose belt. So I pull the alternator belt and start the car. Get the squeak. Pull the Power Steering belt and start the car. No squeak. Get new belt put in on nice and tight start the car and squeak. Sounds exactly the same. I have replaced the power steering unit about three years ago, yes the squeak was there then, so I am thinking the only thing left that could make the squeak is the water pump. Has anyone heard of a water pump making the exact same sound as a loose belt? And why only at higher RPM's? If the bearings in the water pump were bad wouldn't I get some kind of indication at idle? Anyway can anyone give me advice on how best to determine where the squeak is coming from and could it possibly be the water pump? Thanks in advance for any info and advice.