If you have to ask this question, I highly suggest you don't do this on your own.
+1....or read the lable under the hood....
If it needs a charge, it has a leak. if it has a leak, it needs to be located and fixed. Most people do not own the necessary equipment to do this correctly or have the experience to make such repair. just recharging it may make it cool, but it will still have a leak. And at about $1.00 per ounce, refrigerant is too expensive for me to waste......
But if you do it, follow the service manual instructions, use proer equipment, and be careful. Any compressed gas has tohe potential to cause injury.
Ram 1500, 5.2L, 2wd, hardened trans with Derale pan, Hayden trans cooler, kegger mod, SCT tuned. New metallic black paint, TCP e-fans, HS 1.7 Rockers, restored interior.
here's a big hint... The US made a law mandating that all vehicles made in 1994 or later may NOT use R12 (freon) refrigerant in their A/C systems. so all domestics since then have used R134a. Seems to be the standard for automotive use, however there are alternative refrigerants to R134a, but they aren't being used in vehicles that I know of yet.
'00 2500 Sport 4x4 Cummins, powered by the ultra high performance 53 block and the never failing SOVP44! 576hp 1285tq 8/10/2013