If the refrigerant is low it will cause the system to not function. Clutch air gap is an important specification but with the low milage you stated (23K) I dont think that is where your problem is. Automotive A/C systems are notorious leakers so the first check would be is find a reliable a/c shop to check the system. I do believe yours uses the R 134A refrigerant so a shop should be easy to find. Some will tell you that they will need to start fresh with a total a/c system evacuation & recharge. That is acceptable as long as the use dye in the refill charge and top off the oil that was recovered. An honest trust worthy shop will do this. At the very least you will have a fully charged system that would probably finish out this cooling season. Even if the charge does not last the dye will be of a great assist in finding the problem. The R134a is harmfull to the ozone so there is another fluid available but car manufacturers did not start using until 2014 I think. And it is very expensive stuff. It is called y1234 or something like that.