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AC unit knocks and rattles when turned on

(2008 Kia Sorento)
in Chandler, AZ on September 09, 2009
when I turn on A/C my car makes a horrible rattling and knocking. Sometimes it cranks rough as well and when it does that it runs rough for the first minutes
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Popular Answer
on January 19, 2010
Sounds like the AC compressor clutch is failing, how does it run with the AC off?
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