Search  for anything...
Bar's Leaks

Bar's Leaks Liquid Aluminum Radiator and Heater Core Stop Leak. 6 Pack,1186-6PK

    • Based on 3,434 reviews
Condition: New
Checking for product changes
$32.35 Why this price?
Holiday Deal · 35% off was $49.99

Buy Now, Pay Later

As low as $8 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Dec 21
Order within 6 hours and 45 minutes
Available payment plans shown during checkout

Size: Pack of 6


Features

  • STOPS COOLANT LEAKS: Scientifically formulated to permanently seal coolant leaks that are the cause of most overheating problems. Liquid Aluminum is part of the next generation stop leak line which not only seal leaks, but also conditions the system.
  • SEALS HEATER CORE LEAKS: Contains Xtreme Cool which stops overheating and reduces water temperature.
  • SEALS GASKETS: It is guaranteed to safely and easily seal leaks in plastic, aluminum and metal (copper / steel) radiators, heater cores, gaskets and freeze plugs.
  • SEALS FREEZE PLUGS: It will not harm the cooling system, no draining is required.
  • USE WITH ALL TYPES OF TRADITIONAL OR EXTENDED LIFE COOLANT: Including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

Description

Bar’s Leaks® Liquid Aluminum Radiator & Heater Core Stop Leak is the best radiator stop leak money can buy. Scientifically formulated to permanently seal coolant leaks that are the cause of most overheating problems. Liquid Aluminum is part of the next generation stop leak line which not only seal leaks, but also conditions the system. Contains Xtreme Cool™ which stops overheating and reduces water temperature. It is guaranteed to safely and easily seal leaks in plastic, aluminum and metal (copper / steel) radiators, heater cores, gaskets and freeze plugs. It will not harm the cooling system, no draining is required. Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water. For most vehicles leaks seal instantly.

Brand: Bar's Leaks


Specific Uses For Product: Repair


Compatible Material: Anti-freeze


Item Form: Liquid


Special Feature: permanently seals coolant leaks, seals heater core leaks, conditions the cooling system, compatible with various types of coolant and antifreeze See more


Brand: ‎Bar's Leaks


Specific Uses For Product: ‎Repair


Compatible Material: ‎Anti-freeze


Item Form: ‎Liquid


Special Feature: ‎permanently seals coolant leaks, seals heater core leaks, conditions the cooling system, compatible with various types of coolant and antifreeze


Color: ‎Clear


Item Package Quantity: ‎1


Package Information: ‎Bottle


Unit Count: ‎101.4 Fl Oz


Global Trade Identification Number: ‎


Manufacturer: ‎Bar's Leaks


Model: ‎1186-6PK


Item Weight: ‎1.2 pounds


Product Dimensions: ‎2.6 x 2.6 x 7.4 inches


Country of Origin: ‎USA


Item model number: ‎1186-6PK


Manufacturer Part Number: ‎1186-6PK


Special Features: ‎permanently seals coolant leaks, seals heater core leaks, conditions the cooling system, compatible with various types of coolant and antifreeze


Date First Available: March 22, 2013


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Dec 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Works great on a 2018 Chevy Silverado 5.3L
Size: Pack of 1
I had a small leak on the driver side by the lower radiator. I did not realized there is no radiator cap on the 2018 Silverado. I placed the Bar's sealant in the overflow tank where you refill with engine dexcool coolant. Followed the instructions by idling for 15 to 20 minutes with heater on HIGH. Turned off the truck and let it cool down. Fill coolant to level. Drove around a bit and then kept an eye on the temperature and tested the heater on once in awhile (I live in Florida and it is in April). No issues. No more leaks. ... show more
Reviewed in the United States on April 21, 2024 by BoomerSooner
    • Works
Size: Pack of 1
I always put alittle bit of bars leak after any automotive cooling system repair. Stuff works great. My go to for smal leak repair
Reviewed in the United States on May 12, 2024 by 123456
    • Stop leak
Size: Pack of 1
Sealed the leak with no problem
Reviewed in the United States on May 6, 2023 by james n. sam
    • Fixed my Heater Core small leak
Size: Pack of 1
The heater core in my 1995 Grand Cherokee has been seeping since 2000. I used this product in 2000 and it fixed the problem. Over the last 23 years with regular antifreeze flushing, the water pump started leaking. While replacing the water pump, the 20 year old radiator had old signs of leakage that this product had obviously sealed. I replaced the water pump, radiator and thermostat. After refilling with new antifreeze, the heater core started seeping and fogging up the windshield again. I purchased a new bottle of this product and only put in 3oz of the 16.9 and the leak was fixed. My plan was to add 3oz, drive for a few days and stop adding once it stopped fogging up the windshield. I already had some residual product in the system, so only wanted enough to stop the fogging. I suggest you do the same to avoid the issues others have had with too much product in the system which will cause additional issues. If you are adding coolant daily, replace the leaking item as this not a long term solution for these leaks. ... show more
Reviewed in the United States on November 11, 2023 by Brian
    • Works
Size: Pack of 1
Well, worth it worked after 10 minutes no more leak would definitely buy again and very easy to use
Reviewed in the United States on July 25, 2024 by D OBrien
    • easy to install
Size: Pack of 1
I used this on my older Pontiac grand prix sedan. I placed it in my radiator hoping it would seal a leak coming from my radiator. After a week of driving in town and just enough to prevent the car from getting to hot, I still noticed that the product was not sealing the leak to feel satisfying and safe. If it would have sealed the leak after two applications withing the first few days, I would have felt the seal was solved. I feel my older car was just in need of a new radiator and as good as this product may be, it just did not do it for my car. I feel better knowing I have a new radiator in my car, but this product may help your situation. You can't go wrong with a guarantee on the bottle....... ... show more
Reviewed in the United States on April 18, 2023 by Charles
    • It’s too good
Size: Pack of 1
This temporary fix is the best long term solution you’ll find. Just reapply lmao
Reviewed in the United States on June 28, 2024 by Reese R
    • Made things worse
Size: Pack of 1
I have an old ranger with the 2.3 4 cylinder. The radiator developed a slow leak. It is an old work truck so I decided to try this before I sank more money in it. I would have never tried this on one of my newer vehicles. I read the reviews and saw many people had success. I also observed a fair number of problems, but decided it was worth the risk. I followed the instructions to the letter. This crap made things worse for sure. It did NOT stop my tiny little leak, but it did manage to gum up my heater core and my thermostat. My heat stopped working within 20 minutes of operation. Maybe some people have decent luck with this stuff. I must be one of the people that it backfires on. ... show more
Reviewed in the United States on December 21, 2023 by J L. Smith

Can't find a product?

Find it on Amazon first, then paste the link below.