If you bought the car from a garage, and it was advertised as having air con - it must work!
When we got MissyG's car, the ad said AC, but when we collected it, it didnt work. The sales guys questioned if he had said he was going to get it sorted when we viewed the car?
I told him that it was advertised as having AC, therefore it must work as part of the Trade Descriptions act. He made a quick call, and we drove it to the local Kwikfit to get it regassed and they billed the garage