I had the same problem last year, aircon started been intermittent. So I went with the process of immolation, cheapest part first. Went for a regas and they stopped straight away and said the pressure is way too high you must have a blockage and we cant do anything. So looked into it and the compressor had packed in, similar to yours mine was 9 years old.had it replaced about £160 all in and its ice cold. My father in law owns a spares shop so I get every thing at cost. Another is the pressure switch to look out for, if there's no gas, they are known for leaking and are only £17 from Euro car parts. They are easy to change if you have the tools and are the same as the Mk5 golf,Audi A3 and the SEAT Leon.