That your A/C Condensor is working ... this is normal, as long as you mean dripping under the car onto the ground. That is just condensation from the chilled air.
if it's dripping in the truck your drain is blocked... look for a 3/8 tube poking through the firewall in the engine compartment just about above where your left foot would be if you were sitting in the pass seat... poke a wire (weed eater trimmer string works well) in this tube to clear blockage... when was the last time you replaced your cabin air filters?