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BOB GEE
Reviewed in the United States on July 31, 2024
This stuff works great in the cooling system and mixes well with antifreeze.
Anonymous
Reviewed in the United States on May 26, 2024
I poured only ONE bottle in my 1993 Ford F-150 w/ 351ci engine. When the truck leaks a tiny spot of coolant, it is obviously bright and easy to see. It helps me see that I am leaking and helps pin-point the leak!I will be adding one bottle in each of my vehicles now.
Hars Htoke
Reviewed in the United States on September 5, 2023
Easy to see w UV light. I used only 1/2 a bottle rather than the recommended full bottle and the leak still lit up like a Christmas tree.
Stephen Vincent
Reviewed in Canada on December 4, 2023
Nice small bottles for small jobs. Doesn't work if not mixed with water or coolant. Nice and bright when it is mixed and easy to see with a UV light.
Bryan
Reviewed in the United States on May 11, 2022
Everyone should keep this stuff around. Great troubleshooter
Eric Brown
Reviewed in the United States on December 20, 2021
Have been using this product for a long time..use this product along with pressure testing the coolant system..big or small leaks..this product will show where the leak is being produced from..good product!
Cristian Liviu Sima
Reviewed in Canada on June 2, 2020
used to trace a leak of coolant on my 1997chevy 7.4L BBC motorhome that I couldn't find because of hard access to my dog house engine cover inside ... worked like a charm
S Curran
Reviewed in Canada on December 3, 2019
Great price. Helped me diagnose a very small radiator leak that was evaporating. This left a trace that could be seen with a cheap UV flashlight from princess auto.Bought a replacement rad for my f150 and took 2 hours to install. Saved !!! of money
Max the ax
Reviewed in the United States on January 7, 2019
I had a mystery coolant leak on my car, that used a quart of antifreeze per week. I could smell the antifreeze, but could not see the leak. I added one bottle of this dye, and used one of the UV flashlights I bought on Amazon as well. I found the leak in a matter of seconds (Intake manifold to block leak - the antifreeze would evaporate before reaching the bottom of the engine). This definitely works. I recommend to do this at night, or in a very dark place, since the leak will show up as a bright green/yellow light.
Andres
Reviewed in Canada on June 26, 2016
I dumped one bottle of this inside my coolant reservoir. Drove around for a few hours as part of a planned outing, and when I finished I checked underneath the hood and found the source of the leak. I used a $11 UV light that I bought on Amazon as well. All in all, less than 10 minutes of work to find the problem with certainty.
AP
Reviewed in Canada on June 25, 2015
When you first receive the product, you may tear into the packaging and immediately shine a UV light on the bottles to see if the dyes glow like they're supposed to. You might be surprised when it doesn't work. In the bottle, these dyes appear a dark burnt orange; once you mix them with a water-based fluid, they'll turn a pale orange and suddenly become very UV-sensitive. They fluoresce a bright neon green that is easily seen without the need for any "UV-Enhancing" goggles. With a cheap UV LED flashlight, this makes coolant leaks very easy to find. Be sure to run the engine long enough to thoroughly distribute the dye and let it seep into each tiny leak, then go hunting for them at night with your UV light.
Jamie
Reviewed in the United States on October 25, 2015
This stuff really hangs around! Used an entire bottle to confirm Subaru Forester radiator was leaking at top tank crimp, and it worked perfectly. Also used to verify headgasket issue on Infinity G35 - over pressurizing entire cooling system (misting from EVERY hose joint).I changed the radiator and thermostat on the Subaru, and there was enough die left in the system even after refilling with a gallon or two. Great stuff!BTW, I wouldn't recommend NOT just dumping this into the overflow... it took FOREVER to circulate! :)
LAM
Reviewed in the United States on March 14, 2014
couldn't find the leak in my dodge ram coolant system. Took preventative maintenance and replaced water pump, thermostat, and all hoses. Still a slight drip. Pressure tested and found nothing. Put one bottle tracer in, drove ten miles, used ultraviolet light and found leak at timing cover.
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