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  • Bar's Leaks HDC Radiator Stop Leak Tablet - 60 grams
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Bar's Leaks HDC Radiator Stop Leak Tablet - 60 grams


List Price: $23.88
Price: $4.08 & FREE Shipping on orders over $35. Details
You Save: $19.80 (83%)
In Stock.
Ships from and sold by Amazon.com.
  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis
See more product details
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Automotive Winter Driving Essentials
$4.08 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 grams + K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair + ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle
Price for all three: $25.94

Buy the selected items together



Product Information

Technical Details
BrandBar's Products
Item Weight1.6 ounces
Product Dimensions5 x 0.8 x 7.5 inches
Item model numberHDC
Manufacturer Part NumberHDC
  
Additional Information
ASINB000KKND3Q
Best Sellers Rank #8,909 in Automotive (See top 100)
Shipping Weight1.6 ounces (View shipping rates and policies)
ShippingThis item is also available for shipping to select countries outside the U.S.
Date First AvailableJanuary 16, 2007
  
Warranty & Support
Warranty, Parts: Parts
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Product Description

Bar's Leaks Radiator Stop Leak Tablets seals leaks. Conditions cooling system. Inhibits rust and corrosion. Lubricates water pump seals. Helps control electrolysis.

Customer Reviews

Dread replacing the radiator.
R. Horne
I had a minor plastic tank crimp-seam leak that turned into a major overheating problem after adding 4 dissolved tablets.
AJ CA
Was about to order a new radiator, tried this product.
68redcedar

Most Helpful Customer Reviews

15 of 16 people found the following review helpful By S. Flowers on July 20, 2009
I bought a 1976 David Brown Tractor, Diesel Motor with a ugly MiG weld on the side of the block. The weld leaked in 3 places; just enough to make a mess. I added two packages of BARS Radiator Stop Leak Heavy Duty to the radiator and with less then 1 hour on the motor running after I put this stuff in, all leaks stopped. I normally don't write reviews, but this stuff worked for me and I'm happy.
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7 of 7 people found the following review helpful By David R. Voth on June 17, 2013
Verified Purchase
My radiator developed a slow but significant leak after I clumsily bumped my Nissan Pathfinder SUV into a reinforced cinder block wall at low speed in a parking garage. I have ordered a replacement, but needed to patch my old radiator well enough to get me through to the next weekend when I will have time to do the swap.

The label says the tablets will fit in "most" radiators intact - That may be true for full-size American cars and pickups, but not for any Japanese vehicle I've owned. Following the instructions, I dissolved all six tablets in hot water, poured the resulting slurry into the radiator. I topped off with deionized water and started driving around - First to an auto parts store to get a new radiator cap, coolant, and sealant to prepare for next weekend's projects.

After three trips of a few miles each, the leak had attenuated noticeably. I drove out for dinner, and when I arrived at the restaurant there was no noticeable fluid leaking. I checked the radiator this morning, and found it completely full. There was no sign of any leak then or after my Monday morning commute.

I've used other leak-stop products before, and I have to say this one appears to be the most effective. I wouldn't trust anything other than a fully sound radiator as a permanent fix, but I am cautiously confident that the Bar's Leaks treatment will get me to Saturday morning without further intervention.
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7 of 7 people found the following review helpful By Sidekick Fan on June 11, 2013
Verified Purchase
This is the original and the only one that is also for sale and use by GM dealers under different packaging. It works.
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8 of 9 people found the following review helpful By Bayou Biker on June 29, 2013
Verified Purchase
I simply followed the directions, put the tablets directly into the radiator and the small radiator leak is gone. The car is older and has high mileage so I didn't want to spend $500 to replace the radiator. This has been working well for several months now. It does discolor your fluid so you can't hide the fact that stop leak is in the system, so be forewarned. It is a combination of sawdust and clay dust, the small particles fill the hole and the clay forms the seal.
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5 of 5 people found the following review helpful By delton on August 8, 2011
Verified Purchase
I applied this product one month ago in my ford ranger. It has worked great. Very please so far.
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6 of 7 people found the following review helpful By AJ CA on February 20, 2012
I had a minor plastic tank crimp-seam leak that turned into a major overheating problem after adding 4 dissolved tablets. The engine had a 2+ gallon cooling capacity and I added a bit less than the recommended amount.

To add it, I had to siphon some coolant and pre-dissolve the tablets to make them fit in the radiator neck. I followed the instructions and after about 20 minutes of driving, the gauge suddenly climbed and nearly hit the red zone before I blasted the heater. It went down to normal after about 5 minutes, but random overheating repeated itself 4 or 5 times over 2 days of mixed speed driving. It didn't seem related to idling or slow speeds.

I can't know for sure, but I got the impression of the material scouring deposits off passage walls and creating blockages that never existed before. The engine had never overheated to any real extent until I added the Bar's. It DID fix the leak, but only temporarily. The overheating ended up enlarging the leak. There was a chance overheating would have happened with or without this product, but I'd driven for over a week with the leak and the temperature stayed stable. I think the burden of particles in the cooling system triggered something.

The material has the texture of fine sawdust (see Bar's website MSDS) and sinks to the bottom of a container unless shaken. I wouldn't let it sit for too long before you disperse it by driving. But it does wash away easily enough (glass jar test) and I generally wouldn't fear adding it unless you have an older engine that may have passage-buildup, like mine may have. They should give more details about that possibility in the instructions. I also wouldn't gamble with testing it on a hot day, since mine overheated at 55F.
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7 of 8 people found the following review helpful By Yossarian19 on July 11, 2013
Verified Purchase
So, my water pump started leaking from the gasket. Being a professional mechanic, I could have replaced the gasket or, better, the gasket and the pump. I didn't damn well feel like it, though, and thought I'd give this stuff a try. $10 later, I've put two doses of Bar's Leak into the Jeep and it doesn't leak any more. Rad.
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2 of 2 people found the following review helpful By 68redcedar on December 3, 2013
Verified Purchase
My Junk all aluminum Silla radiator started seeping where the tubes meet the bottom tank at month 9. I am now at month 38 with the same radiator.

Was about to order a new radiator, tried this product. One tablet stopped the leak. That is 1/8th the recommended dose as my cooling system holds 4 gallons.

So nice not to see coolant drips on the asphalt anymore
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Most Recent Customer Reviews