If you’re looking to buy a new coolant stop leaks and still confused about which one is best.

Then you’re in the right place because Our team has spent more than 50 hours researching, comparing, and testing the different options available in the market nowadays to be able to compile the following list of picks for the best coolant stop leaks you can purchase right away from Amazon.

First, here are our picks for today along with our research score for each item.

Top 10 best coolant stop leaks (Our Favorites)

Now, let’s take a look at each item of the best coolant stop leaks, in order to know the different features & benefits of each pick.

Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray

$14.62
$7.01
 in stock
29 new from $4.29
Free shipping
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.
  • Seals radiator leaks
  • Seals freeze plug leaks
  • Repairs gasket leaks
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions

K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue

$14.99
$12.47
 in stock
13 new from $12.15
1 used from $11.73
Free shipping
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Permanent Coolant Leak Repair - Just Shake, Pour And Go
  • Mixes With All Antifreeze
  • No Draining Or Flushing
  • Fixes Cracks And Leaks In Radiator, Head Gasket, Freeze Plugs, Cylinder Heads, Heater Core, Water Pump Casing And Engine Blocks

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

$9.37  in stock
20 new from $8.40
Free shipping
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Seals larger leaks seals
  • Repairs heater core leaks
  • Repairs freeze plug leaks
  • Repairs blown head gaskets
  • Repairs blocks

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.

$8.49  in stock
17 new from $5.62
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams

$2.99  in stock
12 new from $2.19
Free shipping
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis

K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

$29.99
$20.41
 in stock
7 new from $20.41
Free shipping
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Permanent coolant leak repair - Just shake, pour and go
  • Mixes with all antifreeze
  • No draining or flushing
  • Fixes cracks and leaks in radiator, head gasket, freeze plugs, cylinder heads, heater core, water pump casing and engine blocks
  • If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully

Bar's Leaks 1196 Radiator Stop Leak - 11 oz. , Grey

$7.77  in stock
22 new from $2.89
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Works with all types and colors of anti-freeze coolant
  • Stops and seals coolant leaks
  • One bottle treats up to 4 gallons
  • Works with all types and colors of anti-freeze coolant
  • Stops and seals coolant leaks

Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz, 1 Pack

$11.13  in stock
4 new from $7.98
Free shipping
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Patented formula quickly stops leaks in radiators, water pumps, and heater cores
  • Boosts corrosion inhibitors to protect against pitting and corrosion, which cause radiator leaks
  • Combination of natural and synthetic components provides the ability to seal leaks up to 0.020" x 0.5"
  • Seals even large leaks without interfering with the flow through the radiator or heater core
  • Stops the leak as well as the corrosive condition that causes it

Bar's Leaks Radiator Stop Leak 2X Concentrate, 6 oz.

$3.15  in stock
16 new from $3.15
Amazon.com
as of May 8, 2022 7:53 am

Features

  • Product type :AUTO ACCESSORY
  • Package dimensions :4.064 cm L x6.096 cm W x12.446 cm H
  • country of origin :United States
  • package weight :0.81lbs

Liqui Moly 20132 Radiator Stop Leak, 0.25 l, 1 Pack

$14.99
$12.12
 in stock
25 new from $8.99
Amazon.com
as of May 8, 2022 7:53 am

Features

  • LIQUI MOLY Radiator Stop-Leak completely seals such leaks immediately with ease. 
  • Secures the combustion chamber from damages caused by coolant admission
  • For all cooling water and heating systems with and without water filters