My son has recently bought a used car from a dealer. On test driving the vehicle it was noticed that the aircon was not blowing cold. The dealer said they would get it fixed and when he went to collect and pay for the car the aircon was working so the transaction was completed. Now, two weeks later and for one of those weeks the car did not move as my son was on holiday, the aircon has stopped blowing cold and makes a high pitched whining noise when turned on. The car came with a 3 month engine and transmission warranty which the dealer states does not cover the aircon. Do you think my son has any recourse or does he just have to accept it?