Wow! SoCal and no air! Got SMOG?
You need to look on the decal under the hood close to the radiator and see what type of refrigerant is in a '93 system... if it's R-134, you might get by with adding a can...
If you can get it in Cal. If it's R-12, give it up.That's only available on the black market,
and even harder to get in your end of the world.
Or take it to an A/C shop and spend a few hundred.