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=== Refrigerant Line Temperature Wrong ===The suction line should feel cool or mildly cold, but not overly icy cold. If the suction line is below freezing (32F) or not within the correct temperature tolerance range for the specific unit, this indicates low pressure in the line.The liquid line should feel pretty warm to somewhat hot. If the line doesn't feel very warm it typically indicates low pressure within the line. This often indicates the system is low on coolant which likely indicates a leak or improper charging. If the compressor is going bad, it can also result in the line temperature being low and pressure being low.A system overcharged with coolant will destroy the compressor. A system undercharged with coolant will operate inefficiently or not cool the home at all. This all relates to the target superheat, which is a property known as superheat, in the HVAC world.