It's fairly easy really. They sell recharge kits at places like wal-mart or autopart stores. You need R-134a, which is all you can buy I'm pretty sure. The kits come with a pressure gauge that tells you if you need more refrigiant in the system or not. You hook the gauge up to the low pressure side of your a/c system which is on the passenger side near the front of the car, it should have a black or blue cap on it unless it was lost at some point. The recharge kit will only fit correctly on that port, if it doesn't fit right you have the wrong port. If the pressure reads low with the engine running and a/c running on max then you can add in refrigerant per the directions on the kit.
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