i know about three fifths of jack-all when it comes to air conditioning so could do with a little help diagnosing a problem with mine... firstly, since i owned the car it's never really blown that cold, although i've gathered that that's usually the case with audis. anyway recently it's packed up altogether. normal heating works fine, it's the air conditioning that doesn't seem to function (and when you're had ac/cc, you can never go back ). these are the symptoms: 1. press aircon button, light comes on as usual in the little display. 2. temperature of air doesn't change at all. 3. speed of air doesn't seem to change (though that could be me!). 4. there's no drain on the engine. 5. there's no added mechanical noise from the pump/engine - previously i could detect a slight noise when the aircon was actuated. only things i've checked are that there's still a belt and that the fuse is ok. is there some sort of process i could go through to determine what the problem is? could it be that the gas has totally leaked out? what's this relay that the haynes mentions about once? also i read on here something about a clutch - what's that about? any help / suggestions appreciated - cheers.