my car air cond was working good but then now it's not cool at all, the a/c power light is on the fan is on but no cool air?
any suggestions?

 

With A/C switch on check to make sure the A/C compressor is working, if not there is a problem.

Is the A/C switch light blinking?

If compressor is not working it could be low Freon or something else. It is possible to jump start start the compressor for a brief time to make sure it is OK.