1998 C230 A/C Recharge

[JTWII]

All,

Looking for someone to walk me through a quick refrigerant recharge on my 98 c230. I literally want to do this over 10-15
min on my lunch hour. I want to make sure I am not going to do any major harm to my system by doing this without an elaborate process or going to the dealer:

1. What type of refrigerant do I use ?
2. Where is the entry port for the refrigerant or refrigerant extension to screw into ?
3. Should the motor be running and should I have the ac running while I am charging the system ?

All info appreciated...Thanks.