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Interdynamics 375CS Radiator/Coolant Dye - 1 oz. Bottle

4.7 out of 5 stars 35 customer reviews
| 4 answered questions

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  • Contains one application of radiator/engine cooling system UV leak detection dye
  • Safe for use in all vehicle makes and models except 1996 and newer GM models that use DEX-COOL coolant
  • Compatible with all types of antifreeze except GM dex-cool coolant
  • Helps locate leaks
  • Professional grade
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$7.99 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Interdynamics 375CS Radiator/Coolant Dye - 1 oz. Bottle
  • +
  • Interdynamics 374CS Engine/Transmission Dye
  • +
  • Uview 413010  Battery Powered, 6 LED Leak Detection Light
Total price: $40.99
Buy the selected items together


Product Information

Technical Details

Brand Interdynamics
Model 375CS
Item Weight 0.3 ounces
Product Dimensions 5.7 x 3 x 1.2 inches
Item model number 375CS
Manufacturer Part Number 375CS
Vehicle Service Type all-terrain-vehicles;utility-vehicles;street-sport-motorcycles;off-road-motorcycles;street-cruiser-motorcycles;street-touring-motorcycles;street-motor-scooters;snowmobiles;marine-personal-craft

Additional Information

ASIN B002M4E0VC
Customer Reviews
4.7 out of 5 stars 35 customer reviews

4.7 out of 5 stars
Best Sellers Rank #10,081 in Automotive (See top 100)
#10 in Automotive > Tools & Equipment > Air Conditioning Tools & Equipment > Leak Detection Tools
#52 in Automotive > Tools & Equipment > Air Conditioning Tools & Equipment > Air Conditioning Line Repair Tools
Shipping Weight 0.3 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available July 7, 2004

Warranty & Support

Warranty, Parts:Parts

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Product Description

Interdynamics radiator/engine cooling system UV leak detection dye, safe for use in all vehicle makes and models (except 1996 and newer GM models that use dex-cool coolant). Compatible with all types of anti-freeze except GM dex-cool coolant 1 ounce to help determine where there might be a leak.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By dc722 on December 28, 2011
Verified Purchase
I ordered the UV dye and a $9.00 uv flashlight from amazon to troubleshoot a very difficult leak in the cooling system of a fiero. I could see drips of fluid on the frame under the engine, but I could not find any evidence of leaking hoses nor any solid evidence that the leak was coming from the water pump.

Just to be on the safe side, I used 2 doses of the dye in the fieros cooling system since it holds about twice as much coolant as a regular car. I waited until dusk and examined the engine with the uv light. The dye showed up bright and clear and I was able to quickly rule out hoses and water pump as the source of the leak. The leak is in a very difficult to view area of the block and behind a heat shield, so I can't get a direct view of the precise place it is leaking, but the drips of dye leave marks even after the fluid dries out so by process of elimination it appears that I have a leak from the head gasket. If I had better access I have no doubt I could see exactly where the leak is, but that would require some disassembly and possibly putting the car on a rack which I haven't done yet.

All in all, this stuff worked great for finding a difficult leak. The leak seems to only happen during actual driving. When I stopped and let the car idle while looking for the leak I could smell but not see any evidence of the leak. (possibly drips drying on the hot block and exhaust). With the dye I could clearly see where the fluid leak had been and places where it pooled (around the oil pan lip, etc) where I never would have noticed it without the dye.

I also showed the car to a mechanic during the day. The dye was visible under uv light during the day as well. I think I'd still prefer to do real troubleshooting in a light-limited environment, daylight visibility was certainly good enough to confirm findings or get a better look at the problem overall.
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Verified Purchase
Helped me determine that the shaft seal on my water pump was leaking in addition to the leaks at the gasket. Glows very brightly and for quite some time. Following the instructions on the package I added the whole bottle to my truck, if I did it a second time I would start with 1/4 bottle and maybe go as much as half. When I removed my water pump the small amount of coolant that spilled on the driveway made a huge glow in the dark mess that took quite a bit of water to wash off.
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Verified Purchase
Easily visible. I added this whole bottle to my coolant system as I have had a persistent leak in my cooling system that leaves no traces on water and coolant alone. I was afraid I had a blown head gasket and watched some youtube videos on the subject and found that a blown head gasket may show traces of this dye in the exit if the exhaust. I was lucky and didnt have a blown head gasket, but found several small leaks around hose connections on my polished aluminum radiator. If you add per the directions you will have unmistakable locations of leaks as this is highly fluorescent. I highly recommend this as I was unable to find the leaks without it for over a year.
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By Critical on November 19, 2013
Verified Purchase
This worked great for finding out the water pump gasket was leaking. One word of advice would be to get a decent quality black light to look at the dye with if you plan on doing this more than once. I bought a cheap one at Autozone for $5 and it would've done better but it still worked perfectly.
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Verified Purchase
This stuff really works! i have had a slow leak in my cooling system for awhile.I kept topping it off time after time and I just couldn't track down. It wasnt enough of a leak to drip and leave a trail. So rather than taking it in to get it pressure tested I decided to try this. since i didn't have any coolant left to lose anyway. I did buy a 21 led light at the same time.(see my review on that).
I topped the radiator off and put the contents in , closed the cap and ran the engine for about twenty minutes. I really didnt see anything. So I had to go on some errands and drove around for a few hours and went home and had dinner. The engine had cooled down and i shined the light all around the engine compartment and sure enough, there was this little spot of bright yellow. It was a loose hose clamp that had the smallest leak. I tightened up the clamp and looked around to make sure there was nothing else to see. I had some engine degreaser and sprayed down the area that had shown a leak and took a drive. when i came back i checked every thing and no yellow dye!! I had gotten very lucky it wasnt something else. I drove it another couple of days just to make sure everything was all right. Then I fluhsed the system and reinstalled fresh coolant
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Verified Purchase
This is THE BEST WAY to find leaks in your cooling system. Dump the whole thing into coolant reservoir or radiator, and then drive it. Later, at night use a good quality UV led flashlight and your leaks will glow brightly! It's that simple.
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works great to track coolant leaks. I added the whole (1 oz) bottle it to a big system (V8) and it seems much stronger than it needed to be. Coolant was almost opaque green. I think 1/4 oz would have worked. Next time I will start with a small dose and see how it goes. Definitely use less than a full bottle on a smaller engine / smaller cooling system.
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Verified Purchase
I poured the whole bottle to the radiator to mix with about 7 qts of coolant. No sign of external leakage even after a few days, checking with a UV flashlight. Been adding about 1/4 quart every other day to bring coolant back to normal level. Engine and transmission oil at proper levels and no sign of coolant contamination. No smell of coolant in exhaust, even shined UV to tail pipes but found nothing. Got my SUV on a ramp and try to look for leakage underneath but found nothing. Pressurized through the radiator cap to 16 psi, dropped to 14 after 5 minutes but remain there. After spending twenty bucks for the dye and UV flashlight, I still have no clue as to where the coolant disappear. Might have to send a sample of engine oil to Blackstone for analysis to see if coolant may leak to engine (must be small). Leaving 3 stars for now.

Updated: It turned out I had a blown head gasket in my SUV. The leakage was small and internal so this dye did not help. However, once I removed the coolant hoses and the head, the effective of this dye is quite evident. It turns the blue Honda coolant into neon-green solution which is easy to spot even in daylight. Bumping it to 5 stars.
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