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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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