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So it is necessary to suck out all the air and moisture even if the kit I get says 'eliminates moisture and acid'?
I would say "yes". I'm not a Pro like "Jet" but I've never seen anything like that either. "Eliminates moisture"? Wonder where it goes or what it becomes. I'd be tempted to cry "snake oil" on that claim, magic bullets exist only in video game world.
Well----let me put in my two cents-----If your AC is cycling often (compressor cuts in and out) about every 3-5 seconds, then you can probably add a can or so and be in fine shape. If the system is completely empty, you have a leak and need to get it repaired before charging back up----if you do have a leak, after your pressure is all gone, you will then have air and moisture in the system. That's why it is important to fix the leak, pull vacuum on the system to get it all out, Then, your system is empty and when charging oil and freon are added, it will operate as it should, without icing conditions caused by moisture in the evaporator core, lines or orffice tube that will block proper flow of freon. Check the fill tag on your system and try to install the amount of lbs. or oz. that is listed. If you have a system that has been retrofitted from R12 to 134A, install 80% of what the tag says and you'll be fine. There are lots of things that can cause a system not to work right, but undercharge, overcharge and a system with air and moisture are the most common.