I have found the compressor. If I close the doors and press the raise suspension button through the window the compressor doesn't seem to be doing anything. Can you normally feel or hear it running if you take the cover off. Are there any checks that I can do to see if it is a faulty compressor...

I have recently brought a discovery and the air suspension seems to have stopped self leveling. If I put a heavy load on the back it doesn't seem to level. Although it seems to ride at normally height unloaded. Also if I press the off road button on the dash, it just keeps flashing and the back...