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Q: Metallic clicking noise when car is idling. on 2000 Ford Explorer

At first i thought the noise was coming from the heat shield underneath until I got under and followed the noise up to my engine. upon further review I isolated the source to be my Belt tensioner Pulley. The arm assembly was vibrating up and down and hitting another piece of metal. I put a long screwdriver in between the movement and noise stopped. Do I need to replace or can this be corrected? In addition the noise gets worse if I turn on the A/C.
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Replace the tensioner assembly , the noise gets worse with A/C , because of the increased load. A new belt(if you are saving the money on labor , by doing it yourself) would not hurt , get quality parts and do it only once!
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