During a visual inspection of any type of system, _____ of _____ are an indicator of a refrigerant leak.

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Traces of oil appear around leak points because refrigerant systems rely on lubricating oil that travels with the refrigerant. When a leak occurs, some of this oil escapes and leaves a visible oily residue on pipes, fittings, or components. That oily film is a common, reliable visual clue of a refrigerant leak. Condensation shows as water droplets, not oil; sounds aren’t a precise visual indicator, and frost lines depend on specific temperature conditions, making them less consistent. So oil traces are the best detectable sign during a visual inspection.