ok, so it did it again tonight...had no problems all day until i was driving home from tarpon springs....i noticed it about 2 miles from my destination. I think ive pin-pointed it to my ac compressor!?!? I took a sound clip from my phone that you can hear the whine REALLY WELL! I had the phone placed right over the a/c...Im dog sitting tonight so ill post up the clip when i get home tomm. I noticed that when i turn the ac off, the noise comes on but when i turn the ac on, it goes away. I pretty sure thats my prob. My question now is...I have no idea what ^ mentioned about the idler pulley....Im guessing thats my problem. Its never been switched and to answer your ? the engine is a ITR b18c5. Is the whole compressor going or just the pulley? ac works fine still...blows ice cold air! also, about how much do they run $ wise? ill check into it tomm or monday anyways! any advice is much appreciated!!!!