I have that bird chirping sound, and I cahnged the belt some months ago, and guess what it's back? I read about the belt tensioner going bad and making this sound, and I read about the idler pulley going bad making this sound. Now I know where the belt tensioner is but where exactly is the idler pulley? Is this something that I can chane out myself? Oh, I have a 01 ses (vulcan)..