The procedure is to take it to a professional. If it needs recharging, you have a leak that needs fixing. You also do not have the skill, nor the tools necessary to do this correctly or safely.
R134a
It takes R134a freon, that's it, no special type..........
R134a Refrigerant
Would have been built for R12, can be converted to R134a.
Was built for R12, should be converted to R134a
How much r134a to refill 2003 ford expedition
how much r134a charge for bus chevy chapion
Chevy switched from R12 to R134a for the model year 1994. Your truck should be R134a.
R134a
R134a R134a freon and also don't forget to add oil as well..........
R134a
Take it to an A/C shop.