When using electronic leak detectors, who is correct in their method of checking for leaks?

Checking for leaks in an air conditioning system with the engine off, as Technician A does, is considered a proper approach when using electronic leak detectors. This method allows for a more controlled environment, ensuring that the detector is not influenced by the airflow generated by the engine running. When the engine is off, the electronic leak detector can more accurately sense refrigerant leaks without interference from ambient noise and other gases that may mask the leak signal.

In contrast, using the leak detector outdoors with the engine running, as Technician B suggests, can lead to inaccurate results due to increased airflow and potential contamination from other sources of refrigerant-like substances. The engine operation can create turbulence that might cause the detector to give false positives or fail to pick up on smaller leaks.

Overall, using the electronic leak detector with the engine off allows for a cleaner and more precise detection process, making Technician A’s method the appropriate choice for effective leak testing in the system.