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Pulling a vacuum on an ac system requires a vacuum pump or venturi pump with the correct type connector. The pump is connected to the low side ac port, and the vacuum could take an hour to pull depending on the pump size.
You'll need a vacuum pump that is used by AC service technicians.
Yes
No AC systems have drain plugs. You do have two valves a low side and high side valve. To vacuum the system you have to evacuate the system first. Then attach a Manifold AC service gauge set to the valves and use a vacuum pump. This really should be done by someone who is familiar with AC service.
You have to use a vacuum pump to totally purge system or moisture and contaminents
If you have done all of the repairs needed then you would get a set of a/c gauges and connect the blue one to the low side and the red one to the high side and connect the yellow one to a vacuum pump. Vacuum the system for about 1 hour and let it sit for 1 hour to see if it will hold. Then you will be adding the correct amount of both freon and oil back to the system slowly while watching the gauges.
If you have done all of the repairs needed then you would get a set of a/c gauges and connect the blue one to the low side and the red one to the high side and connect the yellow one to a vacuum pump. Vacuum the system for about 1 hour and let it sit for 1 hour to see if it will hold. Then you will be adding the correct amount of both freon and oil back to the system slowly while watching the gauges.
They start at the vacuum pump on the driver side of the engine, go up to the firewall, across to the pass side, and then inside the dash at the ac line area.
The name of the AC hose for a BMW 323i is the AC vacuum hose. The hose can also be called the AC pump pressure hose.
Which vacuum diagram The Underhood for the engine or the vacuum for the interior /AC system?
You will have to flush the hoses with a solvent and compressed air, install low and high side conversion fittings, evacuate the system with a vacuum pump, and then recharge the system with oil charge and R134.
The AC vacuum control valve on a 2005 Chevy Classic is located on top of the AC pump. Look for a small pipe that is shaped like an "L", that plugs into the AC pump.