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Moved to General Tech Chat, best for most repair questions that don't have a special home.

They usually get noisy/wobbly first, but can fail totally in a number of ways in the end.
 
Back when I owned my '10 Fusion, the bearings went bad on the pulley tensioner. It was annoying AF driving around sounding like I had some dying animal trapped under the hood. Took the dealer one day to replace and quietness of the engine returned.
 
Yep. My '03 Zetec did that. Mind you, it was well past the replacement interval, but it still blew up without squealing first.

Do the idler and tensioner and belt at the same time and save yourself some agony. Modern serpentine belts tend to look fine right up until the moment they shred, so replacing at the recommended interval is the way to go, in my experience.

Also inspect the other pulleys...water pump, AC compressor, etc...for any play or noise while you're at it. You might save yourself another stranding by replacing one before it fails completely.
 
' Modern serpentine belts tend to look fine right up until the moment they shred...'

Amen sister, and to that I add that pulleys do too. While most make some sort of noise, some do not. The pulley can repeat snag down then free up to snap belt after belt. One can remove belt to easily find a pulley like that but no, we got no time for that.

Only someone that likes to walk changes only one part there, the belt, tensioner and idler all get changed at once or you are asking for it.

I'm thinking of all the people who came in repeatedly to shove broken new belt after belt in front of my face over and over to claim the belts were 'no good', until the pulley finally shelled out to show the true issue. Some could be quite vicious about it.

Lemmings...................duh.
 
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