Question

q15: what are the most common locations of refrigerant system leaks?
the compressor shaft seal and the accumulator
o - rings and the orifice tube or expansion valve
hoses and the filter/drier or accumulator
o - rings and the compressor shaft seal

Explanation:

In refrigerant systems, O - rings and the compressor shaft seal are common leak locations due to their exposure to pressure changes and mechanical stress. O - rings can degrade over time and the compressor shaft seal is subject to wear from the rotating shaft.

Answer:

O rings and the compressor shaft seal