NVQ L4 Automobile AC Technician Practice Questions - Sri Lanka NVQ Level 4 Automobile Air Conditioning Technician Written Examination Exam

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A technician notices that an A/C system's low-side pressure is 55 psi and the high-side is 120 psi while the compressor is running. When the engine speed is increased, the pressures barely change. What is the most likely diagnosis?

The compressor has failed internally and has low pumping efficiency. The expansion valve is restricted or stuck closed. The system has a severe restriction in the liquid line. The condenser airflow is blocked.

Correct Answer:

The compressor has failed internally and has low pumping efficiency.

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