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Idler pulley....
....while there are not a large number of these failures, enough of them have grenaded like this and left people stranded, and in a couple cases that I am aware of, destroyed the car with a belt fire that spread, that I feel you should replace all of them when you replace the serpentine belt.
Most of these cars are over twenty years old now. Stuff wears out. And stuff TIMES out.
When I bought mine, I had the serpentine belt and all of the idler pulleys replaced. The car is a 2004 and when I bought her in 2015, she only had 25,000 miles on her. The technician told me it was a good thing I told them to R&R the pulleys, because one of them was in bad shape upon inspection, even though there were zero symptoms of any trouble brewing.
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550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
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