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Consider how UV dyes work. When installed into the automotive A/C system, they circulate with the refrigerant and A/C compressor oil throughout the system. When the oil and refrigerant (freon) leaks, the dye leaves a trace that can be seen with a UV light. However, In some jurisdictions it is illegal to knowing leaking refrigerants to atmosphere. Therefore, it could be considered that UV leak detection methods are illegal.

After all, you install the dye because you know the system is leaking. You are using the dye to show you where the leak is. We’re not trying to provide legal advice, however you should use caution depending on the laws in your particular jurisdiction.

Recommended Auto A/C Information... Recommended eBooks The most comprehensive auto A/C manuals available! Get them all... or get just the sections you need! How the A/C system works Superheat and Humidity Recharging & Retrofitting Diagnosing Auto A/C Performance Testing Auto A/C Leak Detection Flushing Auto A/C Systems Compressor Clutch Service A/C Component Replacement Auto A/C Tips & Tricks! Review all the auto A/C help information available! Auto A/C Diagnosis Charts and more! See the A/CE Series - Air Conditioning Expert! The 10 Minute A/C Diagnosis! 10 Most Common Leaks Auto A/C Diagnostic Charts Diagnostic Charts for VD Compressors How to Make A Psychrometer What you need to know about Vacuum Pumps New Auto A/C Help for the DIY'er! Just got back from the parts store with freon and you're not sure? Don't take chances! If you're not sure about adding refrigerant or using gauges, you could make a mistake that could cost thousands to fix or worse, you could get hurt! See the A/CE™ Start Series manuals that show you everything you need to know to do the job safely! Basics of Adding Refrigerant & Recharging Connecting & Using Manifold Gauges Pulling Vacuum on Auto A/C systems

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