Finding a tiny A/C or oil leak by eye can be difficult. A UV leak detection kit solves this by highlighting the leak. You add a specific fluorescent dye to the oil, coolant, A/C system, or fuel tank. Let the engine run so the dye circulates. Then, shine the UV flashlight over the components while wearing yellow contrast glasses. The leaking fluid will glow bright green or yellow at the exact point of escape, saving hours of guesswork.
Mechanic Glossary
UV Leak Detection Kit
A diagnostic system that uses fluorescent dye injected into a vehicle's fluid systems along with an ultraviolet light to pinpoint the source of leaks.
Frequently Asked Questions
Yes. The dyes are designed to mix with engine oil, A/C refrigerant, or coolant without affecting their performance or damaging seals.
No. You must use oil-based dye for engine oil and transmission fluid, water-based dye for coolant, and specialized dye for A/C systems.
Use a solvent cleaner or dedicated dye remover spray to clean the area. If you do not clean it, old dye will confuse you into thinking the leak is still active.