No, the A/C is charged with the correct amount of refrigerant. I understand (correct me if I'm wrong), that the compressor is a "Variable displacement" type, that changes how much refrigerant it pumps around according to the needs. So when it's stinking hot, it pushes large amounts around to be most efficient, but when it has cooled everything off, it only moves a small amount around. The idea behind this is to minimise power loss on the engine & to not have the system tuning off & on with a noticable drag on the engine..sort of like the variable displacement V8 engines that turn off cylinders when not needed to save fuel.
Well,mine seems to be on full tilt all the time & I don't know where to start to diagnose the problem.It must have a dead sensor somewhere telling the air cond computer lies & to operate at maximum efficiency.
Has any one been down this road before??
Cheers! Jason