Air condition fault s55 amg
 

Hi everyone,
Just wondered if anyone out there could help me with my latest ****le on my S55 amg.
I have a 2000 model mercedes S55L AMG and the air conditioning has stopped working.
I had it re-gassed a while back and all was well for a couple of months. Then last week the ec light came on..( if I'm honest I'm not sure what ec stands for).
I have had it checked and its not leaking...I have disconnected the level sensor which diagnostics said was the fault and the temperature sensor which also cropped up...the car has been reset at 3 differant times and the air condition will work fine if you leave the car running at a stand still.
However each time it has been reset it can be driven for about 10 miles then the ec light comes on!
Any ideas?
Any help would be much appreciated.
Scott