For those of you looking for coolant stop leak, we have created a list that will simplify the decision-making process. In this list, you’ll discover details and an overview of the top 10 coolant stop leak. You will also find the buying guide on things to consider while shopping for the best coolant stop leak.

Those of you who are short on time can find a quick comparison table of the best coolant stop leak below. Take a look at our top picks! Check out our helpful reviews and find out which products are worth the money. Keep reading to learn more.

Best coolant stop leak

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

EDITOR’S CHOICE

Specifications:

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

$14.99
$12.47
 in stock
18 new from $12.15
2 used from $11.59
Free shipping
Amazon.com
as of August 12, 2022 4:04 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 1186 Liquid Aluminum Stop Leak – 16.9 oz , Gray

PREMIUM PICK

Specifications:

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

$14.62
$8.17
 in stock
28 new from $6.65
Free shipping
Amazon.com
as of August 12, 2022 4:04 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

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

PREMIUM CHOICE

Specifications:

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

$11.31
$10.63
 in stock
6 new from $4.24
1 used from $10.05
Free shipping
Amazon.com
as of August 12, 2022 4:04 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 High Mileage Cooling System Repair, 16.9 oz

Specifications:

Bar's Leaks High Mileage Cooling System Repair, 16.9 oz

$15.09  in stock
21 new from $11.08
Free shipping
Amazon.com
as of August 12, 2022 4:04 am

Features

  • Stops Cooling System Leaks
  • Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
  • Premium Carbon Fiber Formulation For Extended Protection
  • Country Of Manufacture: United States

Bar’s Leaks HDC Radiator Stop Leak Tablet – 60 Grams

Specifications:

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

$6.36  in stock
15 new from $3.08
Amazon.com
as of August 12, 2022 4:04 am

Features

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

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

Specifications:

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

$12.60
$11.99
 in stock
27 new from $8.99
Amazon.com
as of August 12, 2022 4:04 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

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

Specifications:

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

$29.99
$20.41
 in stock
11 new from $20.41
Free shipping
Amazon.com
as of August 12, 2022 4:04 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 Radiator Stop Leak 2X Concentrate, 6 oz.

Specifications:

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

$8.19
$3.15
 in stock
17 new from $3.15
Amazon.com
as of August 12, 2022 4:04 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

BlueDevil Products 00211 Coolant Stop Leak – 16 Ounce, Blue

Specifications:

BlueDevil Products 00211 Coolant Stop Leak - 16 Ounce, Blue

$24.95  in stock
Amazon.com
as of August 12, 2022 4:04 am

Features

  • Permanent repair for all cooling system leaks
  • Safe for all cooling system components
  • Easy to use – No flushing required
  • Safely mixes with all types of antifreeze/coolant

Bar’s Leaks 1196 Radiator Stop Leak – 11 oz. , Grey

Specifications:

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

$10.50
$7.33
 in stock
27 new from $3.69
Free shipping
Amazon.com
as of August 12, 2022 4:04 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