My vehicle has a squeaky serpentine belt.

I have replaced the belt but the squeak was back within days.
Then I replaced the belt tensioner assembly, but returned within days.
What will stop the squeak???

It is likely that one or more pulleys are wobbling or not flat in line with the other pulleys. All pulleys must be in one plane.
If off-angled, a pulley will rub away at the belt. That rubbing will cause a squeak.

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