There's a special tool to disconnect the lines.
Usually comes in a kit with 3 or 4 different sizes.
Here's one kit
http://www.chain-auto-tools.com/air_conditioner_tools/AMR575D.htm
The tools in the above link are aluminum but I'm sure I've seen plastic ones too.
I don't know how they work - the guy who reclaimed the aircon gas disonnected my aircon lines.
Usually comes in a kit with 3 or 4 different sizes.
Here's one kit
http://www.chain-auto-tools.com/air_conditioner_tools/AMR575D.htm
The tools in the above link are aluminum but I'm sure I've seen plastic ones too.
I don't know how they work - the guy who reclaimed the aircon gas disonnected my aircon lines.