What causes AC suction line to freeze?
What causes AC suction line to freeze? Why Frost or Ice May Appear on an Air Conditioning Refrigerant Suction Line. Refrigerant charge level: Improper refrigerant charge (too low a charge of refrigerant in the A/C system can, for a while, lead to too-low temperatures in the coil which will then cause frost or ice build-up on the suction line. Should AC suction line be cold? The Copper Pipe (Suction Line) should be sweating and cold to the touch during a hot day. If it is not cold, your compressor could be off (bad capacitor/ hard start kit) or low on...