1150 High Mileage Cooling System Repair, 1-Pack, 16.9 oz | Restores Performance, Stops Coolant Leaks & Overheating, Reduces Coolant Temperature

I had a water pump leak in my 2012 Ford F150 that was over 4k to fix because of the timing chain and other parts needing to come off. I decided to try this and it worked great. My car is gone now but the thing that failed was not the cooling system, This was a god send to get extra year of a car that I needed to keep driving. No issues in the summer or winter with this.

I have an 03 explorer with the 4.6 that developed a coolant leak behind the block somewhere and of course when it was below 0. I was losing about a pint a week. I only drive once per week, so it was a decent amount. I added in a bottle, followed the directions. Warmed it up, drove it, parked it. And sure enough it seemed to work. After a few days it began to leak again. I called Bar's and they said that due to the size of my engine it was safe to add another bottle but they were prepared to refund me since it didn't hold. Added in another bottle and that did it. No more leaks. This was back in 2024. Fast forward to 2025. In the winter I noticed that if I didn't drive for a week, it would leak, but if I did drive, I had no leaks. During the rest of the year I have had 0 leaks. So there must be something there where the cold might weaken it to the point of leaking but then once it gets hot enough it seals it up again? I have no idea. All I know is that it worked, it didn't plug up the heater core or thermostat. I did replace the thermostat after as it was bad and this stuff did not have any ill effects on it as I wanted to check once it was out. I was going to add this to my mothers vehicle as she was leaking coolant, but it was her radiator that was bad so we just replaced that. I would use this without hesitation if I had another leak that was impossible to get to without a ton of work to fix.

Drove 2500 miles now after what appeared to be a weeping waterpump. Was leaking from lower side of pump about 3 quarts came out when I stopped to get gas. Put this in with 2 bottles drinking water and drove 500 miles home. 100 degrees out AC on all the way. Coolant still full. Have driven 2000 more miles since and hasnt leaked a drop. Waterpump seems solid and doesnt wiggle so maybe just dried seals from sitting for months during covid. Will keep an eye on it but this is some miracle stuff. Waterpump and belt and coolant sitting in garage so now just waiting for it to stop working. I may be waiting a long time. We will see Update May 2022. Waterpump finally went out in driveway but let me take 3 x 2000 mile trips with full AC on and 100 degree temps outside Gave me lots of time to buy parts and tools and fix it in my garage when it blew. Excellent product

Used it on my diesel generator and it stop the leak

After reading many reviews I decided to give this a shot since my radiator was leaking for a couple weeks from an unknown location. After purchase I used it in the reservoir and to my surprise the leak continued again for weeks. I also noticed that my radiator was no longer pulling coolant from its resivior. So I decided to take a peak and noticed the gunked up the hose going from the resivior tank to the radiator. And soon after I found the leak coming from a small return hose. So after finding this I flushed the system and replaced the hoses. So in my instance the Bar,s Leaks did not work for my but it might for you. Just be sure where you are leaking from is fixable with this.

The first bottle did not work, so I poured in a second one, and it worked and stopped the leak. Not sure if this will be a permanent fix, after a month or two, its still good.

Works! I used it months ago to stop a radiator leak on my 2007 Saturn Vue, I pour it in the engine coolant surge tank, it fixed the problem.

Used it as a preventative treatment and it ended up ruining my car ! Clogged the whole system

Stopped the leak great

Que buen producto, mi auto tenia unas pequeñas fugas ya se le habia cambiado la bomba y goteaba, desde que le puse el producto, a la fecha no he vuelto a llenar los Niveles de refrigerante, un gran producto, lo recomiendo utilizado en un MB C200

Excelente producto resolvió las micro fugas

sa marcher

Sello bien la fuga, lo llevo usando por más de dos meses y continúa funcionando. Definitivamente lo recomiendo