My air conditioning (Kia Optima 2003 SE V6) blows warm air; it doesnt ever blow cold air.

Take it to a shop to have it diagnosed. It may be a switch, relay, broken part, or a leak. Do NOT by the little cans of refrigerant and charge the system that can over pressurize the system and lead to more problems. They are only a band aid if you have a leak

true you might have a leak or compressor maybe damaged and or have a vaccum leak in the venting systeme causing the traps not to open properlyhvave it tested with dye only your mechanic can do.it's pretty costly just to have tested alsoruns in the hundreds.just for testingso good luck

did you try turning the ac button on?