Hello and thanks for your question in the autoaid Community.
In the Most times the airmatic Compressor Runs even times, when there is a leak in the System, or the relay is hanging.
You should replace the Compressor and the relay, this is at the End of the fusebox on the left car side.
After this, erase the fault Codes and Start the Engine. NOW the new Compressor should refill the System and you have to Check where is the leak.