You don't. You have an EPA certified shop which has the equipment to properly recover, store, and recycle the refrigerant do it.
Bleed off some freon until you have the right numbers. This should be done by a qualified ac mechanic with equipment to reclaim the freon.
I use a lime green crayon. If you need to get it out of your AC, you will need a freon reclamation machine that can bleed it out safely.
A refrigerant (freon) is required for an A/C system to cool. Therefore, no, the A/C should not work is the freon is removed.
Connect a freon gauge and freon tank to the low side ac port. With the engine running and ac on high, open the freon tank to fill the system to the full line on the gauge.
Expansion valve
Yes your ac just won't be cold
Assuming it is the same type of "freon", yes. The freon would be removed from the old system with a recovory/recycling machine.Assuming it is the same type of "freon", yes. The freon would be removed from the old system with a recovory/recycling machine.
The freon has to be removed and the pressure released from the ac system. Then the valve can be removed and replaced. The system will need to have a vacuum pulled and freon put in again.
Freon is added in the low pressure port of the ac system. It is under the hood close to the ac drier.
Connect a freon gauge and the freon can to the low side ac port. With the ac running on high and the engine running, open the freon. Let it flow until the gauge shows that the system is full.
2-5lbs
The system is probably empty of freon. Running the pump manually without freon can damage the pump. The pump relies on the freon to carry the oil for lubrication.