Old Refrigerant must be removed from the system in accordance with local, state, and federal laws.
Replace the A/C System O-Rings / Seals connected to the A/C Condenser to prevent a Refrigerant leak.
If the new A/C Condenser does not have an integrated drier, replace the A/C Receiver Drier / Accumulator as well. After opening your A/C System, this part becomes saturated with moisture and needs to be replaced.
After installing the new A/C Condenser, evacuate the system for at least 45 minutes to remove any moisture. Make sure it holds vacuum for at least 5 minutes. If it does not, you may have a leak in the system. Find the leaking component and repair or replace it.
Recharge the system with the correct amount and type of Refrigerant as specified in your Owner's Manual.