Hi, I recently had my car in the dealers for various work, I was then offered an aircon service, so thought I'd go for it. Since getting the car back and this hot weather I've noticed it isn't getting as cold as it should and it take a few minutes for it to start going cool. The compressor would seem to be working as I hear the engine note slightly change when it kicks in. Anyway I found out how to run the diagnostics within the Climatronic unit, after the test completes I get 4FA 00 on the dis