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FJC 4910 Universal A/C Fluorescent Leak Detection Dye - 1 oz.

Free shipping on orders over $29.99

$6.64

$ 2 .99 $2.99

In Stock

1.Color:Factory


2.:1 Ounce


About this item

  • Can be detected using any UV or blue light
  • Safe for hybrids
  • Application is 1/4 ounce per 12 ounce oil per vehicle
  • Detects leaks in mobile A/C systems


Universal A/C Fluorescent leak detection dye for use in any mobile air conditioning system. Compatible with A/C systems using PAG or ester oil.


Kathy E.
2025-09-03 10:09:24
Must have item for doing ac work. This stuff does the job, give it a moment to run in the system and use your light to find leaks.I use my gauges to put it in the system, there are many ways to do it, I just prefer that way.Keep in mind this is a dye, get it everywhere and everywhere will light up when you use your black light, you don't want to get it on the ac lines because it will just make it harder to find the leaks.I clean it off the lines with brake cleaner and use Simple Green to wash my hands with if I get some on me.
MDR
2025-09-02 12:48:20
Easy to see, and definitely worth the price. As needed, I will purchase again in the future. A good product.
Cameron
2025-08-28 17:05:33
Helps you find AC leaks with a UV light and glasses. Very bright under light and will stain anything it comes in contact with. Wear gloves and old clothing. What more can you say about this product?
D Gellerman
2025-08-12 17:12:57
It seemed to work. Saw some dye around the compressor. So replacing compressor, condenser, receiver/drier, orifice filter. Everything but some of the lines and the evaporator. In the middle of it now.
Mark M
2025-06-20 13:36:07
Ordered this instead of driving two hours to pick up the bottle I left at home.I don't know if its the dye or the light I ordered along with it, but it's much brighter than the stuff I used to use.Used maybe 1/4 of the bottle to diagnose a damaged AC condenser. Will order again if I run out.
Arved G. Grass
2025-05-16 11:59:11
Way more than I'll ever need, but let me find the leak even without a UV light. Only need to use a quarter or less of the bottle. Arrived timely thanks to Prime membership.
Alexander Sanderson
2025-03-01 15:39:28
It's UV dye and it worked for detecting leaks in my A/C system. The culprit was a bad compressor, so I decided to rebuild the system.
Noah
2025-02-21 12:53:21
Works like it's supposed to, it's thicker than I expected. You could probably use this for quite a few vehicles as you don't need much
Woo
2025-02-11 10:53:51
The green color was finding a leak area on radiator corner area. it worked well for me to help the leakage out.
Richard
2025-01-25 18:26:49
Dure un peu ou savoir le mettre