[richtazz]

Vacuuming the system down also makes sure you have no more leaks. If the system holds vacuum, it's sealed. Also, the negative starting pressure created by vacuuming it down allows the system to accept the new refrigerant better and the resultant air will be colder. Any time you open the A/C system, a new orifice filter should be installed to be sure it isn't clogged up with metal shavings. If the compressor is just leaking you may not have to replace the receiver drier, but if the compressor pump went bad and you found metal shavings in the orifice filter, I would strongly suggest changing it.