Diagbox to check if aircon needs regasing?

[osx]

Can you check this with diagbox or will I have to wait till summer to test the aircon?

[RichardW]

Diagbox will only tell you if the low pressure cut out has activated I think (ie no gas pressure). You only need it to be over 4 deg and the AC will cut in. If it's over 10 then you will easily be able to tell if it's working or not as the pipes will get get cold, and the rad fan will run. It won't tell you the state of the charge though....