Air conditioning default
 

Hi Audi members, I have a problem with my AC. sometimes it breezes cool air sometimes only gas contaminated air. I have checked it several times with the local mechanics and some tell me my Air Compressor is weak and need to replace it. Weak in terms the electricity inside is not enough to power the running of the compressor. There is no leakage in the gas as the level is same at all times in every check. A time ago one of my freinds suggested that the air condition sensor may not be working.He suggested me to try to change first the censor and if it does not return to the normal than I need to change the whole compressor. I tried to search with our local agents in country and on ebay for the consor, all what I get is the complete unit.
Am I to change the whole compressor or only the censor, If censor , where can I get it?
Thanks