You need a set of pressure gauges to hook up.
You take it to a professional, the freon you buy in the store is not what your car needs !
For adding additional Freon, you will need the proper Freon type of Freon and connectors for your vehicle. The Freon is added through the low pressure port of your ac system. If your system needs a complete recharge then the air needs to be removed first (known as pulling a vacuum) before Freon is added.
It's R-134 and it is not freon any more.
You call a licensed contractor and have them check your system. If they determine that it needs freon, they can add the right punt.
There is no DRAIN the system needs to be evacuated by a qualified repair shop the freon in the system may be so-called envornmently freindly but you can not release it into the air.
This is something that needs to be done by a professional, because the a/c system needs to have the freon removed prior to taking the lines loose. They can remove the freon and store it while the hose is being replaced and then put the same freon back in.
The exact amount of Freon that needs to be added to a Kia Optima is unknown. This is because if Freon is needed there may be a leak and the car will need to be taken to a mechanic.
In the automotive industry freon is used in the air conditioning system. You need to take your vehicle to a shop if the system needs to be recharged.
Needs to go to a mechanical shop that has the tools. You are unable to fill on your own. Its illegal. If you do decided to do it on your own, you will need a vaccuum Air Condition Machine that can vaccuum the system and then pressurize the system.
take it to a shop it needs to be reclamed
To know when an air conditioning unit (non-window unit) needs to be charged (needs freon), it will not cool properly or you can test it with the appropriate gauges (see related link below).
when the air does not comes out cold in your ac will be a good time