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Your cart is empty.LeakFinder offers fluorescent dye for all conventional coolants. These dyes are useful for locating leaks in radiators, hoses, heater cores, water pumps, and fittings. The LeakFinder coolant dye fluoresces green and is compatible with all leak detection flashlights (blue light, violet light, and ultraviolet light). The LEAKFINDER brand was designed to be a cost-effective solution for end-users in the automotive aftermarket. The LeakFinder product line is perfect for DIY jobs and small to mid-sized automotive repair shops. The ultraviolet fluorescent universal dye provides the most precise leak detection for all automotive air conditioning systems containing R-134a, R-1234yf, or other widely used refrigerants. Our dyes can find the smallest and most problematic leaks that would otherwise be impossible to detect. They are the perfect tool for finding small, sporadic leaks in cars, truck and other automotive AC and fluid systems. Proudly made in the U.S.A., Tracer Products is a family-owned company with three generations of experience in delivering award-winning professional service and the industry’s most powerful leak detection dyes, inspection lamps and diagnostic tools. Today, major OEMs around the world trust the Tracerline brand. Over 275 million vehicles have used Tracerline’s UV fluorescent leak detection dyes to ensure quality and system integrity. For more than 60 years, Tracer Products has engineered the highest-quality, premium performance leak detection dyes and products. As the inventors of UV fluorescent leak detection, we take pride in crafting the most superior leak detection dyes in the industry.
Anna Ledesma
September 5, 2025
This item is great to help finding leaks. Just pour it in reservoir, run the vehicle a while and then when its dark enough you can use a UV light and find the leak. The only thing that can make this better is if could fill the leak, but that's probably asking too much.
C. Baccus
September 3, 2025
Tried another product that wasn't as good. This one worked perfectly and was very easy to identify leaks with. Found the leak from a hose right away. Confirmed no other trouble spots which is what I was using it mostly for. Would recommend and use again if needed.
Terry
August 17, 2025
This helped me confirm it was my water pump that was leaking.
Joanna C.
August 2, 2025
I got this for my husband that has been having antifreeze leak. He was able to spot it and fix it. Update: months later, had another leak and was still able to find it!
Big Al
July 29, 2025
Worked kinda, hard to see even with blue light but solution was clumpy and a lot of sediment on bottom. Maybe it was too cold out for it to dissolve and pour but could be old as well not sure. Didn’t really help me find a leak but replaced radiator and hoses anyway so all good.
Terry L. White
July 25, 2025
As a self-proclaimed "YouTube mechanic", I am able to do a lot of automotive repairs myself. Diagnosing problems is frequently the biggest hurdle. I knew that I was losing coolant, but after checking all the fittings on the cooling system and frequent checks in the engine compartment for leaks, this coolant leak was eluding me. I finally decided to buy this leak detection dye and a small blacklight to pinpoint the source of the leak.I cracked the small bottle open and checked it with my blacklight. It did NOT fluoresce, so I was a bit skeptical that it was going to help me find my leak. But, I'd come this far, so I decided to pour it into my coolant reservoir. As I did, a couple drops dripped onto the edge of the wet reservoir opening and POW, bright green. So, it reacts to the water in the coolant and is very easy to see (even without the blacklight).After running the engine for a few minutes to let the coolant circulate, I found that the fitting near my heater core was dripping a drop of bright green coolant every couple seconds. The source of the leak was identified, and angels sang.Days/Weeks of guesswork solved very quickly by this product. Would absolutely add this to my cooling system diagnostic kit.
d. Beers
July 14, 2025
Finding a coolant leak. Worked great.
A user in Kentucky
May 16, 2025
Makes leaks easy to find, bought by mistake but we found a pinhole leak in my sister's radiator.Easily paid for itself many times over.
Bruce Pitt-Payne
April 28, 2025
Windshield washer leak
Anna Ledesma
April 24, 2025
This item is great to help finding leaks. Just pour it in reservoir, run the vehicle a while and then when its dark enough you can use a UV light and find the leak. The only thing that can make this better is if could fill the leak, but that's probably asking too much.
C. Baccus
April 9, 2025
Tried another product that wasn't as good. This one worked perfectly and was very easy to identify leaks with. Found the leak from a hose right away. Confirmed no other trouble spots which is what I was using it mostly for. Would recommend and use again if needed.
Terry
March 30, 2025
This helped me confirm it was my water pump that was leaking.
Joanna C.
March 29, 2025
I got this for my husband that has been having antifreeze leak. He was able to spot it and fix it. Update: months later, had another leak and was still able to find it!
Big Al
March 18, 2025
Worked kinda, hard to see even with blue light but solution was clumpy and a lot of sediment on bottom. Maybe it was too cold out for it to dissolve and pour but could be old as well not sure. Didn’t really help me find a leak but replaced radiator and hoses anyway so all good.
Terry L. White
February 13, 2025
As a self-proclaimed "YouTube mechanic", I am able to do a lot of automotive repairs myself. Diagnosing problems is frequently the biggest hurdle. I knew that I was losing coolant, but after checking all the fittings on the cooling system and frequent checks in the engine compartment for leaks, this coolant leak was eluding me. I finally decided to buy this leak detection dye and a small blacklight to pinpoint the source of the leak.I cracked the small bottle open and checked it with my blacklight. It did NOT fluoresce, so I was a bit skeptical that it was going to help me find my leak. But, I'd come this far, so I decided to pour it into my coolant reservoir. As I did, a couple drops dripped onto the edge of the wet reservoir opening and POW, bright green. So, it reacts to the water in the coolant and is very easy to see (even without the blacklight).After running the engine for a few minutes to let the coolant circulate, I found that the fitting near my heater core was dripping a drop of bright green coolant every couple seconds. The source of the leak was identified, and angels sang.Days/Weeks of guesswork solved very quickly by this product. Would absolutely add this to my cooling system diagnostic kit.
d. Beers
January 28, 2025
Finding a coolant leak. Worked great.
A user in Kentucky
January 17, 2025
Makes leaks easy to find, bought by mistake but we found a pinhole leak in my sister's radiator.Easily paid for itself many times over.
Bruce Pitt-Payne
January 11, 2025
Windshield washer leak
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