How to refill gas in car air conditioner

I got a HIJET. It's gotten hot recently and I noticed that the air conditioner isn't working well. It seems like there's not much gas, so I refilled the additive and gas.
It's the season where the heat and humidity are unbearable. It's hard to have a car with an air conditioner that doesn't work. Gas recharging is easy, so why not give it a try?
The effect of additives and gas recharging is...
Additives are effective when the air conditioner in a car that has been around for many years is not cooling well. Don't add them frequently. Don't put in too much gas either.
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#HIJET
#DIY
#Air conditioner
#Gas refill
#Car