We've had the car for over a year now. Recently air.con stopped working. I checked it, when I turn on the A/C the engine sound used to change and you'd see dip in revs. Now there is no reaction when I turn on the A/C. So I suspect the compresor is not engaging for some reason. There must be a clutch on it, which has stopped engaging. So my question is what would be a likely cause. I'll take it to a shop but I want to be informed on what to expect. Or is it something I can take a look at myself. <p>PS: In case there are "use the search engine" police amongst you I did a search and found many threads, none of which seemt to explain what to expect.