If you've had a hole in your condenser, then all the refrigerant is already gone. You will want to flush each component (Condenser, Evaporator Core, Compressor, and all lines not attached to the receiver/drier) before replacing your receiver/drier. Also, its a good idea to pick up an assortment of A/C o-rings from the local parts store and replace them all. Once that is done, you will need to have the system placed under vacuum, which will do a couple of things:
1- Checks for any other leaks
2- Helps pull any junk, left over flush or moisture out of the system
At that point your system is ready for a new oil and refrigerant charge.
'00 WJ 4.7 Limited- Some stuff
'03 WJ 4.7 Laredo- Some more stuff
Originally Posted by wjjeep19
It is what Jeeples has stated.