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Rbraczyk, Unfortunately to do it right it is that complex. You may get some to work by just adding it, But by using those cheap little gauges(Where everyone on the shelf reads different just sitting there) you cannot do it properly. You cannot know how much refrigerant is in the system by only checking low side pressure and checking low side pressure at 85 degrees with 70 % humidity is going to show a different pressure than at 80 degrees and no humidity. The only true way to know how much is in the system is to evacuate and charge by weight. To much refridgerant can have detrimental effects on the system and it can also cause poor cooling. To even do a decent backyard charge you still have to have a high side gauge and in order to get refridgerant in (if it needs more!!) is for the compressor to be running because if there is some refrigerant in the system the system and the can will have equal pressure. If indeed you want to try to add more you can put the can of refrigerant in warm water to raise the pressure in the can higher than the system.It may not even need refridgerant in the first place so by adding more you may be creating another problem. If it is low on refridgerant it had to leak somewhere and if it is low super low and you only add refridgerant it will shorten or end the life of the compressor because when you loose refridgerant you also loose oil. It may not be rocket science, But it is foolish to just start adding refridgerant everytime the A/C don't work. It is things like that that cost more in the long run. I am not saying that it doesn't just need some refrdgerant, But those little reharge kits you by at auto zone are toys at best. I still say he should go to aircondition.com if you want good help and it is free.You might even learn something there. I don't mean that to be sarcastic I just think it is a good place to learn more about A/C.
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