Jeep Repair: A/C system, vacuum pump, conversion kit

Question
My A/C quit blowing cold in my 93 YJ (6 clyn).  I bought a 134a conversion kit but i'm not sure how much i'm supposed to put into my system. And, yes all the labels and stickers that probably were there originally are long gone. So, any help would be appreciated. Thanks, Dax McCrory

Answer
Have someone that works on air conditioning systems evacuate the old coolant (requires a vacuum pump made for this purpose), reseal the system as directed in the kit, change the evaporator, reoil the system (internally) and charge the system to the correct pressure.