No.

You break EVERY connection and use a flush gun which is basically a pressurized vessel with a flushing solvent and a blow gun. You blow the solvent in both directions and blow it out with compressed air.

If you are flushing after a catastrophic compressor failure you flush back and forth multiple times to remove all metal debris. If you are flushing to remove oil to change from one refrigerant to another you don't have to be as dilligent. You must make sure that you remove ALL traces of flush, then replace r/d last.

Add the correct amount and oil type, evacuate and charge.

Have a great day,