Either the belt has aged and loosened so the tensioning roll vibrates or a bearing is worn out . In either case you must check it immediately and replace the used parts, it can fail at any moment and the damages can be very serious.
Try taking a waxy soap and holding it to your belts somtimes the wax
will seal up cracks in the belts that sometime make whistling sounds..
if its near to 100000 miles please change your timing belt soon
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Thank you! I'll check it now.
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