Question about 2007 Toyota Corolla
Most likely a loose or worn belt.
With the engine off, check the belt for excessive play. There should be no more than 1/4" deflection (from center) on the longest run of the belt.
If it is worn - replace it. If it is new - the belt tensioner may be broken.
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Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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