A technician is performing a qualitative leak test on an R-134a A/C system using a fluorescent dye. The dye is identified around a line fitting. What is the primary limitation of relying solely on fluorescent dye for leak detection?

Question: A technician is performing a qualitative leak test on an R-134a A/C system using a fluorescent dye. The dye is identified around a line fitting. What is the primary limitation of relying solely on fluorescent dye for leak detection?

Answer options: ✅ It can be difficult to see in bright daylight without a UV lamp.

• It can contaminate the refrigerant and damage internal components.
• It can only detect large leaks and is ineffective for small, pinhole leaks.
• It reacts negatively with certain lubricants, leading to false positives.

Correct answer: It can be difficult to see in bright daylight without a UV lamp.

Explanation: Fluorescent dye requires a UV lamp to be visible, making it challenging to detect leaks in bright outdoor conditions without proper lighting. While effective, it's often used in conjunction with other methods and technicians must be aware of its visibility limitations.