My Aircon works fine from the day I bought the JK back in 07.
I have always run the air con full on, for at least one day every week.
If you run the air conditioning in the winter it will help to keep the system well lubricated and leak tight. This is because the refrigerant actually carries the oil that lubricates the system and most importantly the compressor. It also keeps the seals and hoses moist, thus preventing them from drying out and cracking which can lead to leaks
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Jeep Green JK Unlimited CRD Renegade Manual
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