Hi, I have a 2005 Ford Focus 1.6 Zetec Mk2 and have been having some issues with its air conditioning system. It has the manual air conditioning, not the climate control system. Every summer since we've owned it (October 2011) we've had to get the air conditioning 'gas' filled up every time we wanted to use it. This often meant once we got the rare week or two with very warm temperatures, that I'd have to go to a garage and get the system 'filled up'. The thing is, after a month or so, the air conditioning becomes non-functional, and just starts blowing out lukewarm air. Because the warmest of the weather has gone by then, it's forgotten about and the same process is repeated again next summer. Now to me, this seems odd. Having to get the system filled up again after such a short space of time doesn't seem right to me, especially since we don't use the system excessively. I don't have any formal knowledge about car air conditioning systems and it'd be great if someone could shed some light on this, and tell me if this normal. Thanks.