AC unit knocks and rattles when turned on on 2008 Kia Sorento

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

Asked by for the 2008 Kia Sorento
1 answer
Sounds like the AC compressor clutch is failing, how does it run with the AC off?