It's better to evacuate it if the system has been opened or leaked all the way down, but back when I worked at a used car lot, we just filled the damned things up and about 99% of the time they were fine.
I found it cheaper to buy the one large can from checker. It was a decent buy and came with the gauge so you can save it for next summer. I don't suggest it, but you could just use a screwdriver to let the air out if you have air in the system. Make sure you have the can upside down when filling it so you get the gas in and not the compressed air.
If there is any pressure in the system, it's not air my friend, it's refrigerant along with a small amount of oil. you cannot simply "let" the air out, it must be vac'd out because when the pressure inside the system equalizes to match the outside pressure, nothing more will escape.
It's better to evacuate it if the system has been opened or leaked all the way down, but back when I worked at a used car lot, we just filled the damned things up and about 99% of the time they were fine.
The key is to use a brand new accumulator. It's sole function in life is to remove the moisture on the FIRST charge. The desiccate inside the accumulator (also called a drier) does just that, dries the refrigerant of all moisture. You can get by without changing the accumulator, but then you'll have to vac it down, which you seemed to have covered from your posts.
Remember, the factory doesn't have time to vac every single brand new car it builds, so the accumulator does the job for them.
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