It states in the manual that the air con must be used for at least 15 minutes
every week otherwise the rubber seals will perish and the gasses will escape,
no gas, no air con. Use it or lose it.
OK, I lost It, What Now?
You have 2 options, DIY or get a professional to do it.
The info you will need to arm yourself is as follows.
600cc = 620g + 180cc compressor oil
700cc = 450g + 180cc compressor oil
Get A Professional
Look online for a local garage that deals with AC. This way you know
the system has been drained and everything has been done properly.
Do It Yourself