I have a 1995 Taurus SE with the 2V 3.0L V6. When the car is in gear or in park and the A/C is on (basically when the engine's turning at less than about 1000 RPMs), you can hear a metallic rattling noise coming from the serpentine belt area. After about 1000 RPM everything seems normal. I was going to take off the belt and try turning the pulleys by hand to see if anything was obviously wobbly or rough, but when I tried to relieve tension on the belt by using a wrench to turn the bolt on the tensioner pulley, the bolt just turned as if it was stripped and the tension was obviously not relieved. The belt isn't obviously loose or anything. I'm not sure if this is what is causing the noise or if it's an entirely different problem. The car has
40,000 mostly city miles on it if it matters, and the belt was changed about 2,000 miles/2 year ago (the car isn't driven very much).Any ideas would be appreciated. Thanks.
Chris