RELD Head Gasket Tester Kit Combustion Leak Detector for 50 Tests

Works perfect. Easy. I tested it against my exhaust and it turned yellow in anou 1 min. But on Mr radiator it stayed blue. I was lucky. But has my headdgasket leaked I am confident it would have turned greenish yellow. I highly recommend this

Worked as it should. Easy to use

My car had a blown head gasket that has now been repaired. When the symptoms first arose, it appeared to pass this test. When the symptoms were severe, it also appeared to pass this test until I firmly pressed down on the cork to hold it tightly into the opening of the coolant tank. When I pressed down and held it firmly in place, the test immediately changed color. But there was no color change without pressing on the cork, even after running the test for 15 minutes. The directions do not mention this. I took off one star because the cork isn't airtight enough by itself without being pushed and held down by hand. Also, be careful with the blue liquid. It is easy to pour in too much. It comes out fast.

This test if incredibly helpful and a great value. Here is how I used it:2013 Toyota Prius (2ZR-FXE) - 212k milesMy car was showing classic symptoms of a blow head gasket. The cold-start death rattle. This car has no radiator cap, so I put the plug into the resevoir. The plug fit tenuously. I put the Prius into mainentance mode, so that the engine would run continuously. After about 6 minutes of warm up it began to bubble. By 8 minutes the fluid had turned yellow. Not fun, but conclusive.Additionally, after using K-Seal to try and plug up the head gasket, I did the test again and still got yellow. (Although my cooland level now seems to be steady and not draining.)2024 Toyota Tacoma (T24A-FTS) - 41k milesThis is a test to make sure the fluid remained blue. Again, this radiator has no cap. After a long while warming up and reving the engine I could not get it to bubble. It remained blue. I blew into the bottom of the plastic bubbler with my breath to make sure the fluid turned yellow. It did.2005 Toyota 4runner (2UZ-FE, 4.7L V8) - 136k milesThese engines are not known to have head gasket issues. The plug did not fit well in the radiator cap hole. I had to hold it in place. Once it started bubbling, I let it continue for about 2 minutes and it remained blue. Once again I blew into it to make sure it was working and it turned yellow.I would say that this is a great kit to help determine if you have a head gasket issue.

Works as intended. In my case the pressure coming out of the radiator was a bit dicey with all the hot water bubbling. Did confirm my head gasket suspicion very quickly. Some of the liquid got pushed out to be honest but the bit that stayed in was yellow after the few seconds I had it on there for.

This product saved me over $10000. I own a Kenworth semi truck and pressure was building up in the cooling system. After diagnostic mechanic told me there is a major problem with the engine. I found out about this test, bought it and performed 2 times on different days. Test liquid didn’t changed the color so I got a little hope that there is something else. Later after some other diagnostic it was confirmed that it was my air compressor failing, not the engine. I recommend everyone do do it if suspected engine failure. First time I just put the plug and run the test, second time to ensure it is air tight I hold it with my hand. Easy to perform the test.

I purchased this test for my 2003 Chevy Express 2500, because two different shops told me, that based on a visual inspection, that my drivers side head gasket might be leaking.I am the second owner of this vehicle (the first was a school district) which has just over 150 miles on it's 6 liter. It has never overheated on me, no mayonnaise in the oil, on the cap, or dipstick, no white smoke or visible leaks, uses no oil between changes, etc.A head gasket job is expensive.I bought the test because of the reviews, and ran the test twice, once from the over flow tank, and once on the radiator. Both test came up blue, and both times I verfied the chemical worked by exhaling into the tester and got a quick yellow both times. I know I am happy I didn't pay $200 for a shop diagnosis, for under $25 (8/2026) I don't need to worry about the head gasket, and return to my regularly scheduled maintenance program.

This test kit was great. Great price , easy to use and quick results. I was hoping that the liquid would stay blue but it turned yellow right away. I wasn't really surprised with the results but it was good to see it clearly right away. So now I focus on the job at hand with the clear results!

Très facile d'emploi. Le résultat est rapide et sûr.

Muy buen producto. Cumple su función.

Dacht dat mijn BMW 325i n52 een lekke koppakking had. Dacht bestel ik dit maar om te kijken als dat werkelijk het geval was. Gelukkig geen lekke koppakking🥳

Würde ich immer wieder kaufen.Schnelle Lieferung, einfache Anwendung und funktioniert auch bei Traktoren.

PROVATO SULLO SCUTER E FUNZIONA.