AC Pro is a great air conditioning Freon (refrigerant) recharge kit, where you too can top up with some Freon in under 15 minutes. And, it's pretty easy to use, too! First, a quick peek under the hood will tell you where the AC compressor is located. Once you've found it, trace the tubes and hoses that lead from the compressor. You should find two ports with colored caps on them - one for the HIGH side, and the other for the LOW side. You can then plug the AC Pro kit into the LOW side port of the compressor. Look at that AC Pro can's gauge, and turn the dial to correspond to the outside temperature. Now, squeeze the trigger until the pressure gauge reads within the V.