As for the A/C not being cold, check the condensate line that runs along the crossmember right in front of, and at the bottom of, the radiator. The 99-01 GV's had a problem with the rubber line clamps causing corrosion, leaking all the gas, and the A/C would stop working. The problem was so bad with the first few years that they re-designed the clamps with a different rubber to prevent this. If the system has no charge, its a good chance this is the cause.
As for the controls, I dunno. It is 10 years old and might have broken.