If the noise is still there, try this. Start the engine and open the hood. Take a small amount of water and pour it on the belt. See if it chances the sound. If it does, then the belt may be loose or worn out.
NOTE: Protect your eyes because water may fling back at you. Also, wear old clothes.
Let me know if this changes the sound.
Friday, December 11th, 2009 AT 10:47 PM