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several times on ac systems with cap tubes or piston metering devices I need to add freon to raise the evap pressure to 60#. but in so doing I get too low a superheat reading. normally I expect the suction line to be slightly cool to the touch. but when the suction line gets very cold I think its because of the freon I added in order to raise the suction pressure to a point high enough to keep the evaporator from freezing. the system will work this way but I don't like that cold suction line. any suggestions of insights?