Radiator Stop Leak Tablets (HDC)

  • Can Bar’s Leaks be installed in existing antifreeze?

    Yes, this product is specifically designed to be directly added to the cooling system with out having to flush out the antifreeze.

  • Will Bar’s Leaks work in the new extended life antifreeze?

    Yes, Bar’s Leaks is compatible with both conventional green (silicate-based) and extended life red/orange or yellow (OAT) antifreeze.

  • How does Bar’s Leaks work?

    Bar’s Leaks will seal external, internal and coolant to oil leaks. Once installed, the Bar’s Leaks particles shrink up to 15 percent. On an external leak, the tiny particles flow to the point of the leak. They then collect at the outside of the seepage and build inward. Internal leaks, the Bars Leaks particles will burn when subjected to the 5000°F heat of the combustion chamber to seal seepage and small cracks. On coolant to oil leaks, where coolant can seep into the crankcase contaminating the oil, the tiny Bar’s Leaks particles will seal the pores in cast iron and aluminum preventing seepage.

  • How long does it take for the Bar’s Leaks to work?

    We recommend you drive/idle vehicle for 15 to 20 minutes. In most cases the leak will be sealed with in this amount of time. If the leak is not sealed, a second application maybe required.

  • Will Bar’s Leaks plug my heater core?

    No, the tiny particles will pass through a 24-gauge mesh screen which is the spec for the BIG 3 car/ truck manufacturers. They say that any product installed in the cooling system must pass through this screen. Bar’s Leaks is one of only a few stop leak products to pass this test and to be approved by the vehicle manufacturers. 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.

  • What if I don’t have a radiator cap?

    If vehicle does not have a regular radiator cap, remove top hose where it attached to radiator and insert tablets in hose and then reinstall hose.

  • How do I pre-dissolve tablets?

    Just add tablets to warm water.

  • What are the dosage recommendations?

    One package treats systems up to 3 gallons. Use 2 (two) tablets per gallon of coolant capacity.

Our product engineers created these Bar’s Leaks Radiator Stop Leak Tablets to repair radiator leaks from within so you can get back on the road in no time. These tablets might not be able to surf the web, but they are definitely more powerful than you think. But what our radiator leak repair tablets offer in effectiveness, they don’t sacrifice in usability or affordability. In fact, you need no special automotive expertise to apply our tablets to repair radiator leaks.

Our Radiator Stop Leak Tablets inhibit the formation of rust and scale, neutralize pH imbalance, control electrolysis, lubricate and seal internal, external and coolant-to-oil leaks. Imagine getting that range of effectiveness in a product you can buy off the shelf rather than through service only a mechanic can provide. In fact, this is the same product that’s been used right on the assembly line by OEM automakers around the world for 30+ years. This solution is the result of careful research and testing on the part of our team of top-flight chemical engineers. They work each day to improve existing products like our radiator leak repair tablets, as well as to develop new products to keep up with the latest in automotive innovations and technologies.

Your leak’s days are numbered. Pick up a pack at your nearest auto parts store and make sure you watch our how-to video for an easy step-by-step installation process.

America’s Best-Known Chemical Repair Brand

Whether you need radiator leak repair or to stop a leak related to head gaskets, engine oil, power steering, transmission or other auto components, Bar’s Leaks offers a full suite of time-tested, customer-proven solutions. We offer chemical repair products for a variety of automotive solutions, each designed to represent the utmost in affordability, usability and effectiveness. While you can find a number of product alternatives that claim to repair radiator leaks, you won’t find the same level of effectiveness — and sometimes these other products make your situation worse than before.

Made right here in America, just an hour outside of Detroit, radiator leak repair products from Bar’s Leaks are the latest in a nearly 70-year history of creating chemical repair solutions for everyday drivers. We strive each day to live up to the legacy of service and effectiveness that tens or millions of customers have enjoyed through our many decades of operation. When you want the best in radiator leak repair solutions for your vehicle and the investment you’ve made in it, choose Bar’s Leaks.

Get the product you need for repair of your radiator leak today.

Leave a Review

  • “Per your suggestion I ran 12 packs of your "Bar's Leak" tablets through my heating system for 48hrs. I reconnected my heater, purged the system, added 2 new tubes, and heated my water to 110 and its working great. Please tell Fred on your Tech Support team "Thanks for the phone call and like the Nautilus, Bar's Radiator Stop Leak Tablets got me through the cold spell in Phoenix."”

    Hank Flores - Phoenix, AZ
  • “I operate two 300 hp boilers for the purpose of melting snow on the plaza area of Aspen Highlands ski area. This fall we discovered several small leaks on the fire tubes of the boilers. The repair cost to have them welded would have broken our budget. Remembering the story of the USS Nautilus, my co-worker brought up the possibility of using Bar's Leak. 2500 tablets later (the preventative maintenance dose) and our boilers are no longer leaking. You have a great product! Thank you!”

    M. L. - Aspen, CO
  • “On behalf of the congregation at Fort Valley First Baptist Church, I would like to extend my heartfelt thanks to your company for providing the stop leak for our boiler system for the last three years. Our system is approximately fifty years old, and with the additive, we are able to safely use it each year. Your cooperation and generosity are much appreciated!”

    Rev. D. Stubbs - Fort Valley, GA
  • “Work magic in less than 20 mins. I used epoxy puddy on the outside of my radiator leak. Drove around and let it cure. Still was leaking. Added 4 tablets(crumbled) to my radiator. Drove for 15mins. Check the area..no more leaks. Awesome product thanks.”

    J. Taylor - Richmond,Va