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I have a 2000 van that has just begun to make a squealing sound when the air conditioner is turned on. With it off, the sound is normal. As soon as the AC is engaged, a noticeable squeal is heard in the passenger compartment. I wondered if it could be the tensioner pulley?
 

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How many miles on the serpentine belt? I replaced mine when I did the timing belt and my AC-on noise (was a constant fluttering/light chirping sound) completely disappeared.

Worst-case possibility (but low probability) is something (AC compressor or the tensioner pulley bearing) is starting to lock up, causing the belt to slip and squeal.
 

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Replace the belt. Mine was doing the same thing and the belt looked good on visual inspection. I figured a $20 part was worth the shot and the new belt took care of it.

Sometimes the cracks are so small you cannot really see them well with the naked eye.

Now, quiet as a church mouse.
 
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