in and what pressure do you put it at. where what and how do you put freon in to make the air conditioner blow cold air how to you rechange a aircondioner.
You do have to be a licenced ac tech. R134 is not sold over the counter. You will need to have the leak found. Ac systems are sealed units. In a perfect world they should never need to be recharged. Sorry.
go to autozone and get a can of r134a refrigerant. the one with the hose and guage. and read the instructions. very simple and remember you have to add when the car/ac is on.