There could be many reasons for the A/C not to work. Lack of refrigerant is only one of them. Among them are the low pressure switch, the high pressure switch, fuse for the compressor, or a bad clutch. Add to that, air in the system, too much or too little oil in the system, bad compressor, plugged receiver/dryer, just to name a few more. Adding refrigerant before diagnosis is just asking for failure. The only way to properly diagnose the state of charge is with a set of gauges and a charging chart. First step is to determine if there is enough refrigerant in the system to activate the low pressure switch. This switch shuts off the compressor when the charge is low. Usually cuts off around 25psig. Activates at 45psig. Once you have determined tat there is enough refrigerant to operate the system, check for power at the low pressure switch. If there is power there, you can momentarily jumper it to see if it turns on the compressor. At this point, the high pressure switch should be on unless it has failed. Also note that systems that were originally R-12 did not use a high pressure switch in most cases. Next, check for power at the compressor connector. If you have power there, and the clutch still does not engage, then the clutch is bad.
As you can see, there is more to an air conditioning system that just putting in more refrigerant. In my opinion, those charging kits should be banned. The general public is simply not qualified to service refrigeration systems.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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