I have a 2003 Kia Sedona. The A/C Compressor will not kick in. Checked all fuses and relays and nothing? A/C was working good then all at once it quit.

There is a BCM computer ( body control module) that runs all this.
http://www.kia-forums.com/kia-carnival-sedona-2002-2005/255434-2005-sedona-bcm-location.html
Check the wires to it.

check all fuses in the right kick panel. if you have the cover the inside gives you a diagram of what fuse is what. check for illum fuse, iod and audio.

Check fuses end relays. Fuse could be blowin. If the lights don,t come on on the heater control panel for the different funtions, Mostly the fuse has (Blowin)

Normally you would check for voltage at the relay then the low pressure switch, then the compressor clutch.
With the system charged or the low pressure switch bypassed you should have 12 volts at the clutch and ground. You can also check the clutch with an ohms meter to see if the magnet is open.

They are on a fuse number F20 (10A), located in the kick panel.

there are 2 fuse boxws 1 by the driver left foot (kick box) and 1 under the hood . there are diagrams as to what each fuse and relay are. there should also be a section in your owners manuel to help you locate fuses and relays some vehicles also have 1 under the dash. along with more relays and circiut breakers that reset automaticly. some times auto manufactures get bright ideas and put them somewhere else.as a industrey standerd they always put the locations in your owners manuel

sorry but most a/c problems must be checked out where they have the specialized equipment to do so. the simplest thing to check are the fuses, relays and connections which you can do. beyond that its off to the mechanic.you can do more harm than good if you start messing with the system as you may make it harder to diagnose the initial problem.

You will have to look to see if the wire is still attached,but more than likely the system needs to be reset ,by removing the negative battery terminal for 25 seconds,and replacing it,then charge the system.

It sounds like an emission problem egr or catalytic convertor

Well my a/c spopped working to,was told it was themegentic clutch switch that work the compressor,might have to replace a/c compressor