A few days ago I noticed a new noise. A rythmic / phasal squeal most likely emerging from one of the pulleys on the serpentine belt.
At idle, it phases from low to high volume at 15 to 20 seconds intervals. At higher RPM the phasing is faster however the pitch of the squeal doesn't rise.
You can hear it start 16 seconds into this video, and stop at about 19 seconds. (it's actually audible the entire time, just peaks at 16 to19s, and much louder IRL)
Direct Link to video (sorry my attempt to embed didn't work)
What do you think is most likely the source of this?
At idle, it phases from low to high volume at 15 to 20 seconds intervals. At higher RPM the phasing is faster however the pitch of the squeal doesn't rise.
You can hear it start 16 seconds into this video, and stop at about 19 seconds. (it's actually audible the entire time, just peaks at 16 to19s, and much louder IRL)
Direct Link to video (sorry my attempt to embed didn't work)
What do you think is most likely the source of this?