Air conditioner recharge

If older then 95, it runs r12 refrigerant, and you need to have a pro use a recapture machine for the newer formula conversion. If 95 or newer, simply remove the low pressure line cap, plug on your 134 refrigerant w oil can, and fill with vehicle running and AC on. Do not over fill, most these DIY kits have a gauge, so keep it in the green.