Frost around a fitting or mechanical joint is a strong indication of a refrigerant leak, as it results from rapid evaporation causing temperature drops. Oil residue around these joints is also a common sign. Other indicators like water pooling or odor are less reliable in diagnosing a refrigerant leak.
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Identifying a refrigerant leak can be aided by observing frost or oil residue around fittings. Frost indicates a rapid temperature change due to refrigerant escaping, while oil residue often indicates a leak as oil escapes with the refrigerant. Other sensory indications, like odor or water pooling, are less reliable. ;