have a 2002 subaru outback llbean ac wont run full charge both high and low, can jump compress and run.

...well there is an evaporator that needs to breathe too, check for junk clobbering up reducing the heat transfer potential...another problem may be overcharging...check the specification...probably 22-24 PSI...perhaps it's been overcharged "jump compress" what is this a failed relay or a safety telling the unit should not come on at this time (due to overpressure?) blast your evaporator clean with a hose and check the flow capability (diverter doors) to make sure it isn't trying to heat and cool at the same time~