You can go to any discount auto parts, napa, or autozone, pep boys or what not and get a can of Refrigerant with a gauge on it...all the directions are on the can. I've been doing it for years...Keeps is nICE and cold!
How Do I Recharge The Ford Contour Air Conditioning?
Bring your unit into nearest site offering such air conditioner services like famousacandheat, they know best things and will do such thing for your unit.
Why am I not getting voltage to the compressor on 1999 ford contour I jumped the low pressure switch and still no voltage