Automotive Service Excellence (ASE) Air Conditioner Certification 2025 – 400 Free Practice Questions to Pass the Exam

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What does the low-pressure gauge on an A/C manifold gauge set measure?

The pressure in the suction line

The low-pressure gauge on an A/C manifold gauge set measures the pressure in the suction line. This gauge is specifically used to assess the low-pressure side of the air conditioning system, which includes the evaporator and the suction line that connects the evaporator to the compressor. By measuring the pressure in this line, technicians can evaluate the system's performance, identify potential issues, and ensure the system is operating under the appropriate conditions for optimal cooling efficiency.

Understanding the pressure in the suction line is critical, as it directly influences the refrigerant's ability to absorb heat and produce cool air. This measurement helps diagnose problems like low refrigerant levels, blockages, or improper compressor operation, all of which can affect the system's overall efficiency and functionality.

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The pressure in the discharge line

The temperature of the refrigerant

The humidity level in the cabin

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