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Over about a month, I heard a faint knocking sound coming from the engine. It sounded like it was coming from the serpentine belt. I bought my car with a full dealership history, so the serpentine belt it had when I bought it is months ago was still just 30k miles new. When the belt finally snapped a few weeks ago, I investigated.
I don't know much about engines, but I noticed the serpentine belt wraps around four wheels. Three of them are ridged, one of them isn't. The upper ridged wheel (the uppermost one, right next to the oil dipstick) spins easily to the touch, as does the non-ridged wheel immediately below it. The other two ridged wheels I could barely spin at all; I wrapped my hand around the back to move them but they were all locked up.
I think they're the problem, maybe they seized up and caused the belt to snap. But I don't know what makes them spin, or if they're supposed to spin as easily as the uppermost one does.
I don't know much about engines, but I noticed the serpentine belt wraps around four wheels. Three of them are ridged, one of them isn't. The upper ridged wheel (the uppermost one, right next to the oil dipstick) spins easily to the touch, as does the non-ridged wheel immediately below it. The other two ridged wheels I could barely spin at all; I wrapped my hand around the back to move them but they were all locked up.
I think they're the problem, maybe they seized up and caused the belt to snap. But I don't know what makes them spin, or if they're supposed to spin as easily as the uppermost one does.