This could be a serpentine belt or a pulley.
You can check your belts by looking at them and pushing down on it.
If there's obvious cracks in the belt, or if it's pretty loose, replace it.
You can check the pulleys by removing the belt and spinning each pulley by hand.
Keep in mind that it's pretty hard for me to diagnose a noise with so little information. Some people's "high pitch" noises are different from others.
If I can be of further help, let me know. Good luck.
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Wednesday, November 17th, 2010 AT 3:08 PM