Air conditioning recharge

May be a stupid question, but I need to recharge my A/C in my 2002 Intrepid. (I decided to do it by myself) Can anyone tell me which valve is the high side input, since they are not color coded. (blue) The valve by the radiator, or the valve hidden near the back end of the engine? Any pictures would be helpful. (nothing but trouble with this car, new new transmission put on it at 30K miles, and air is trying to give me grief at 55K). Thks Dz

I meant low side sorry

the low side port is located near the passenger side wheelwell under the intake air hose.