When recovering refrigerant from a household refrigerator whose compressor does not run, it is recommended that low and high side access valves be installed because _____________:

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When the compressor isn’t running, there’s no circulating flow to push the refrigerant out of the system. Opening both the low- and high-side service valves gives a complete path for refrigerant to be drawn by the recovery machine from both sides of the sealed system. This setup lets the recovery unit remove vapor from the high-pressure side and liquid (or vapor) from the low-pressure side, which speeds up recovery and helps meet the required recovery efficiency. If only one side is opened, some refrigerant can remain trapped and the recovery may be slower or less complete, making dual-side access the practical and often necessary approach.