2003 buick century air conditioning controller apparantly not working hot one side, cold the other, gets warm quickly

There's only one evaporator core, so if you're getting cold on one side and not the other, then the blend door isn't working on the warm side. The actuator motor may be working but the door might not be moving.

Air Conditioner blows warm air

1. Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
2. Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

Hi. There seems to be a blockage within the system. I will list all parts to be checked by your mechanical. I would also have the blend door linkages or servos inspected for fail points along with the listed areas of concern, below:

Loose or broken drive belt
Inoperative compressor or slipping compressor clutch
Defective expansion valve
Clogged expansion valve, receiver-drier or liquid refrigerant line
Blown fuse
Leaking component: any of the parts listed above or one of the A/C lines, hoses or seals.

Instruct your mechanic to check all the above, along with the dash blend door linkages for faults.

You should have a blend door actuator. This can be bad or the door itself can be broken. It is most likely in the dash and not easily accessible.

is it HOT or just not as cold. If its HOT, like heated air, there is a door problem, if its just not cool, the a/c refridgerent is low and will need a recharge, most likely the comp is leaking.

I would check fuse in the fuse box on driver side.Should be a 15 amp fuse.

It sounds like a actuator is bad or not getting proper vacuum to open or close on demand.
here is a diagram of your system

is it wet on the pass side floor ??? your heater core is out.. hard to replace...

I am having the same problem.

The problem is with the diverter valves in the dash.