Vacuuming the system does NOT remove the oil from the system!!

Excess oil reduces system cooling capacity..

Flushing the system is a manual, time intensive procedure:
* Remove and drain the compressor.
* Replace the receiver/dryer.
* Remove the hoses to flush by hand.
* Connect hoses to the evaporator, and flush.
* Connect hoses to the condenser, and flush.

The fresh oil must be divided between components, the factory service manual has the specification for each model/system.