If the system has opened to the atmosphere, you have to evacuate the system first, meaning vacumme the system, suck out the air inside. You might have to have shop to do that if you don't have vacumm pump.
If the system has opened to the atmosphere, you have to evacuate the system first, meaning vacumme the system, suck out the air inside. You might have to have shop to do that if you don't have vacumm pump.