my a/c does not hold freon. i had work done on my radiator.what can i do?

Take it to a professional. It's clear you have a refrigerant leak. Most likely a compressor or evap leak. After all it's only 17 years old.

You replaced the radiator.the condensor is right in front. what are the odds that the condensor got moved in a way that jarred a fitting a little , or maybe knicked the condensor removing or re-installing the radiator?evac. , vacuum system for at least 30 minutes , then as long as it's holding vacuum ,charge to proper level with dye.Then you can check for leaks with an ultra violet light and the correct goggles (yellow).