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When performing engine pre-heat for refrigerant removal, it is crucial to ensure that the compressor is not operating. Pre-heating is done to facilitate the efficient removal of refrigerant by increasing pressure and temperature. If the compressor is running while attempting refrigerant removal, it can cause the refrigerant to circulate within the system, which can lead to incomplete removal of refrigerant.

Additionally, operating the compressor during this process could potentially damage the compressor itself, as it may introduce non-condensables into the system or result in the system running with insufficient refrigerant, leading to further complications and inefficiencies.

Proper handling of the broader protocol, such as ensuring hoses are connected correctly, using the right type of refrigerant, and checking vacuum levels, are essential safe practices but do not directly address the risks associated with having the compressor running during refrigerant removal.