kh laser aircon problem

[simonr23]

my gf has just bought a kh 1.6 laser. the aircon 'system' works it seems. i can hear the compressor actuate, the engine gets a bit more load on it and the a/c engine fan comes on. the problem is that there is no change in temperature, nor any de-humidifing. could it just be that it's out of gas? if so, i'd assume it's all leaked out for there to be no "aircon" effect happening. where should i be checking for leaks? any cheap things i can do to save a wasted regas?
thanks heaps.