1996 Dodge Intrepid Not working

The compressor will come on if jumped at the relay. I have tried several relays, and nothing happens. Also, when you push the button to turn the A/C on from the control panel, you can here the fans kick on, but the compressor does not spin. When I did jump it from the relay to make the compressor work, with the cooling fans on, the vent temp was about 38 degrees. Could this be the pressure transducer that is bad? And is it east to fix? Do you have to evacuate and recharge the system?