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Check to see if the compressor is coming on by turning on the AC while in park and listening for it. You should also see the RPMs drop a bit when it comes on.
If it is coming on then you just need to recharge the refrigerant. You can pick up a recharge kit from your local auto parts store. It'll cost you about 40-50 bucks. It should come with detailed instructions on how to recharge it, but basically you need to find the low pressure port, hook up the refrigerant bottle and charge it while the AC is running.
Look at the hoses on the back of the a/c compr.. there will be a big and a thin hose, the big hose is the lower pressure hose, that's the one you want to recharge your a/c system, stay away from the thin that one is high pressure, follow the big hose, on it you will find the port to recharge the a/c system.
You can buy a recharge kit at your local parts store. The kit comes with a pressure gauge to let you know when the coolant level is good, over charged, or low. The kit cost about $25. With the kit hook up, it can't be hooked up wrong with the high and low pressure ends. You will be able to use this over and over, just buy new cans when you need to refill.
It shoud have R134a, I would use a recharge kit. If you have a slow leak this will only be a temporary fix. They usually sell a kit with a dye inside the can, If you use that you should be able to locate where the leak is.
The real answer to your question is yes, the kit may work. Here is why you shouldn't use a recharge kit:
Theoretically, your vehicle's refrigerant (R134a) should last forever. Your AC system is a sealed unit and the refrigerant never gets used up. The only way you can lose refrigerant is by it leaking out of the system.
However, if your refrigerant can leak out then air and contaminates can get in. This is bad. A recharge kit simply injects refrigerant into the system. It doesn't evacuate the system of any air and contaminates.This is critical. Your AC system should be hooked up to an AC machine in order to evacuate out all of the air and contaminates in the system. The machine will then hold a vacuum on the system to verify its integrity.Finally, the machine is able to inject new compressor oil that also contains a dye that will enable the leak to be located.
If you use that recharge kit, you stand the chance of over pressurizing the AC system and causing premature compressor failure. This can be very expensive. Paying a reputable shop to evacuate and recharge your AC system is much less expensive.
If your AC system hasn't operated in over 6 months, it's especially critical that you have the repair to your AC system performed correctly. Your AC system's seals may have dried out and the new compressor oil will be critical in helping to recondition those seals or the seals may need to be replaced.
Good luck and hope this helps. keep me posted if you need help to recharge the system.