During a performance test of an air conditioning system the liquid line from the condenser to the receiver-drier should be?

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The liquid line should be warm to the touch during a performance test as it carries refrigerant in a liquid state from the condenser to the receiver-drier. The receiver-drier removes moisture and contaminants from the refrigerant before sending it to the expansion valve. If the liquid line is too cold or too hot, it can indicate a problem with the system, such as a restriction or a refrigerant undercharge or overcharge.

During a Performance Test of an Air Conditioning System the Liquid