Radiator Stop Leak Concentrate
See What Our Customers Are Saying View More Testimonials
I developed a quart a week coolant leak from my 2000 Mercury Grand Marquis. It was coming from a crack in the small coolant tower integral to the non-metallic intake manifold. These cars were subject to a class action lawsuit against Ford for this problem. I was too late to be covered for this $800 repair so I poured in half of the 10 oz. bottle of the radiator stop leak before a 700 mile trip last week. Leak stopped cold. Thanks, guys. - M. K. - Boca Raton, FL
- Can Bar’s Leaks® Radiator Stop Leak be installed in existing antifreeze coolant?
Yes, Bar’s Leaks works with all types and colors of antifreeze coolant and/or water.
- Will it work in the new extended life antifreeze?
Yes, Bar’s Leaks Radiator Stop Leak works with all types and colors of antifreeze coolant and/or water.
- Do I need to drain my cooling system after using Bar’s Leaks?
No, this product is designed to be left in the cooling system to protect from future leaks and overheating.
- How long does it take to see results?
We recommend you drive/idle the vehicle for 15 to 30 minutes. In most cases the leak will be sealed instantly, but others will require up to 30 minutes. If the leak is not sealed in 30 minutes, a second application may be required or mechanical repair may be needed.
- Will Bar’s Leaks plug my heater core?
No, Bar’s Leaks® Radiator Stop Leak will not clog a clean heater core. Note: If using Bar’s Leaks® to stop heater core leaks, make sure you turn your heater control to HOT. Some vehicles have a valve that controls coolant flow through the core and is only opened in the HOT position.
- What are the dosage recommendations?
Use one bottle for regular size cooling systems; this covers most 6, 8 and 10 cylinder engines. Use 1⁄2 bottle for four cylinder engines. One bottle treats up to 4 gallons. For larger systems use 1 bottle for every 4 gallons of capacity.
- Can I install Bar’s Leaks in my overflow reservoir?
Yes, if direct access to the radiator cap is not available, install in overflow / reservoir tank.
- I accidently added Bar’s Leaks into my gas tank, what should I do?
Bar’s Leaks is only designed to be added to the cooling system. If the product is accidently installed in the gas tank, the tank should be removed and cleaned out by a professional mechanic.
- The bottle froze before I was able to use it, what can I do?
If the bottle did not break from freezing, just let the product thaw out, shake well, and use as normal.
At Bar’s Leaks, each of our products is easy to use. There’s no special automotive expertise required. If you can pop the hood on your car, you can use our radiator sealant and other products. Each of our solutions is affordable, costing just a fraction of what you’ll spend working with a mechanic. And each of our products comes with the promise of effectiveness.
Our radiator stop leak concentrate is one of many chemical repair solutions available at Bar’s Leaks. This product is specially designed to stop minor cooling system leaks and drips caused by normal cooling system wear and age. It works with ALL types and colors of antifreeze coolant and/or water.
All you have to do is watch Bobby and Caitlin in our how-to videos and follow our easy installation process. These videos are created to make a simple-to-use product even simpler to understand and apply to your vehicle.
Bar’s Leaks: Time-Tested Solutions for Your Automotive Problems
At Bar’s Leaks, our chemical solutions go beyond just radiator leak sealant. We also offer chemical repair solutions for problems related to cooling systems, head gaskets, engine oil, power steering, transmissions and more. As with our radiator sealer, there’s no special automotive expertise required. Each product is affordable and effective, and each works quickly — especially when compared to the cost of visiting a mechanic.
You’ll no doubt find other radiator leak sealant products, but not all of these products work as advertised. In fact, many can actually make your situation worse. At Bar’s Leaks, each of our products is the result of careful research and testing by our top-flight chemical engineers. These professionals are always improving our current products in pursuit of perfection, and they’re also constantly developing new products in response to auto manufacturer innovations and new technologies.
Made in the U.S.A., just an hour outside of Detroit, each Bar’s Leaks product is heir to a legacy nearly 70 years old. We’ve been serving everyday drivers for decades, offering special solutions that are far more convenient and far more affordable than seeking professional help at the repair shop. When you need a radiator leak sealant you can trust, choose Bar’s Leaks.
“I developed a quart a week coolant leak from my 2000 Mercury Grand Marquis. It was coming from a crack in the small coolant tower integral to the non-metallic intake manifold. These cars were subject to a class action lawsuit against Ford for this problem. I was too late to be covered for this $800 repair so I poured in half of the 10 oz. bottle of the radiator stop leak before a 700 mile trip last week. Leak stopped cold. Thanks, guys.”
“I heard of your products before, but never had to use it until just a few days ago while I was on the 2010 Hot Rod Power Tour. My 1968 Camaro's radiator started to leak on the tour and I thought I was done and would need to replace the radiator at a cost of around $500 before I could get back home. I purchased a bottle of your Bar's Leak radiator stop leak and almost like magic the two holes in my radiator stopped leaking. I was able to drive the car from southern Illinois to north of Minneapolis without even one drop of coolant being lost. Thanks for a wonderful product and I would suggest to anyone that is going on a trip to have a bottle of this product in their trunk for an emergency. Even if you don't use it, there maybe someone out there that just might.”
“Hi, well here it goes, I drive a car that has a lot of miles, over 200 thousand on it. Well I had a leak that wasnt huge just really bad. Well Im not going lie about it I did use other things from homemade things to over the shelf products with good things talk about. Then I went to my local auto parts AUTO ZONE and told the clerk my problem and the clerk took me to your product. I had a lot of questions but I was told by the clerk it was the best there was for what was wrong with my car. I used it like the directions said, you can say I havent been happier with a product, it really did what it said WOW really WOW. My car doesnt over heat, and it doesnt leak! I have my car back, before I found your product, it was 3 gallons of anti freeze a month. Well in the end of things you have a great product here, this is the first time Ive ever did a testimonial for anything. Thanks!”
“After roughly 270,000 miles, my 1993 Crown Vic developed a small radiator leak. Poured in a bottle of your radiator leak stop, drove for a couple of days and coolant level has remained constant ever since. Great product, works as claimed, which is rare in today's market place.”
“For your product I thank you very much. Me and my girlfriend went out on Valentine's Day and we were stuck in traffic and the car started smoking. We pulled off and got the car stopped for a while and went to the nearest station and saw that the radiator was cracked, I went in the store and they had 2 bottles of radiator stop leak left. I purchased both of them (because I have a V-8) and poured both of them in and took off. We drove for 70 miles to the house and it still works great!!! Thanks Bar's Leaks!”
“I just wanted to tell you a testimony on your product. I poured in the bottle last night, and drove for about 30 minutes as the direction suggested, and voila, my radiator was full of water this morning. I was amazed, because I was pouring two gallons of water in the radiator every day, because people had said that these products clog the heater core.; But, when I searched your site and read FAQ, I was assured your product will pass through the number 24 screen which big three cars have, so I decided to try, and I am very pleased; I bought another bottle just in case I need to add more, but I didn't need to. I will probably use it next year again as you suggested for maintenance.”
“I want to comment on your Bar's Leaks Radiator Leak sealant. I had a very small leak on my '02 Silverado, and was adding coolant every week. I was afraid I was going to have to pay a mechanic hundreds of dollars to tear my engine apart in order to find the leak. I read about your product on another web site, so I thought I'd give it a try. So, I topped off my coolant and added your product. One week later, my coolant level is exactly where I topped it off at. Thanks for making a great product, and saving me lots of money.”
“This product really helped me out, I had a cracked cylinder head and for a second I thought it wasn't gonna work but just had to pay really close attention to the directions, my last step was putting more antifreeze in the radiator and ever since it has stopped leaking, in at 186,000 miles with a 01 grand Cherokee Laredo, will update any changes in the future. Thanks for the help amigos! Saved approximately 1000$-1500 on parts and labor.”
“I didn't believe it would work. I read negative things, but I fixed my car radiator leak for less than $4 in my '01 Mustang. It worked, it really works. I checked it a minute after I had been at work for over 6 hrs and not even a drop is on the ground. Thank you. I believe it because I've personally seen it.”
“Your product saved me $1200.00 in repairs. I had my radiator, hoses, water pump replaced in a span of 8 months and cost me over $2000.00 in repairs. Since April 2017, I've been topping off my coolant reservoir every 3 days because it's always empty and always seeing radiator fluid leak under the hood. Desperate and broke, I went to AutoZone and bought the Bar's Leaks product and poured it in the reservoir. Pop the hood the next day to check the reservoir and to my surprise, It's full!! No more leaks anywhere. It's been three weeks now and not a single drop of leak. Thank you to all of you for making this "Miracle Product"!!!”