How do you stop the squeaking noise from ac compressor on a 2000 kia sephia?

You should check the belt. My Sephia was doing the samething and when I looked at the was worn and needed replacement. If it isn't the belt, the clutch on the compressor could be slipping and may need replacing as well. I would first check the belt..if it looks dry, you can get some belt dressing from any auto store. If the belt looks like it can be replaced I would do so. Hope this helps you. the pumps ceap ouyt on these cars i would take the belt off and call it a day or just cut it off