Check the Cig and gauge fuses in the driver's kick panel and the A/C fuse in the passenger kick panel. Then, go to Page AC-2 in the TRSM and follow the troubleshooting steps that are listed. You may need a set of A/C manifold guages, if the first few things don't fix or help diagnose things.
There is a sticky in the Tech section, I think, that tells you how to vacuum/refill if necessary. Good luck!