Top 10 Heater Core Stop Leak – Fuel Leak Detectors

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1. Bar's Leaks

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

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Bar's Leaks #ad - Seals freeze plug leaks. Lowers water temperature. Repairs gasket leaks and heater core leaks. Special shipping information: This item cannot be returned and has additional shipping restrictions. Seals radiator leaks. Seals freeze plug leaks. Bar's leaks liquid aluminum stop leak seals radiator leaks. Repairs gasket leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height7.4 Inches
Length2.6 Inches
Weight1.2 Pounds
Width2.6 Inches
Part Number1186
Model1186
Warranty1 year manufacturer

2. K-Seal

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Block, Head Gasket, ST5501 8oz, Water Pump Casing, Heater Core, Multi-Purpose Formula Stops Leaks in the Radiator, and Freeze Plug, Pour and Go, Trade Trusted-Stop Leak, K-SEAL Coolant Leak Repair

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K-Seal #ad - Customer support: if k-seal engine coolant leak stop doesn’t seal, the system might be over-pressurized. Save time/money. Us bestseller. Pour and go: our cooling system sealer is easy to use: just shake the bottle, add to your radiator/overflow and run the engine! Unlike some traditional products, it mixes with all types of antifreeze, absolutely no draining or flushing required.

The only car radiator and gasket sealant university tested to meet ASTM D3147. Seals cracks and stops leaks: a diy alternative to costly repairs, freeze plug, our coolant leak fix permanently seals cracks and holes! It quickly repairs your leaking radiator, heater core and water pump casing with no adverse impact on efficiency. Repairs in minutes: formulated to permanently weld radiators, including hard plastic aluminum heads and blocks in old and new cars.

Check the technical Specification section of this page for extra instructions for a successful repair. Scientifically tested: safe and effective, our cracked block repair can seal leaks up to 1/32 of an inch! Once cured, the repair withstands the high pressure of the combustion chamber, all without failing or clogging the cooling system. Over 8 million bottles sold worldwide! .
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height6 Inches
Length7.87 Inches
Weight0.6 Pounds
Width2 Inches
Part NumberST5501
ModelST5501
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

3. K-Seal

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Multi-Purpose Formula for Truck/Tractor Coolant Leaks in the Radiator, A True Pour & Go -Trade Trusted, K-SEAL Coolant Leak Repair ST5516 Heavy Duty 16oz, Head Gasket, Water Pump Casing & Heater Core

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K-Seal #ad - Seals cracks and stops leaks: avoid expensive downtime, block, our coolant stop leak will permanently seal cracks and holes! Quickly repair your head gasket, freeze plug, leaking radiator, heater core & water pump casing with no adverse impact on efficiency. Check the technical Specification section of this page for extra instructions for a successful repair.

Over 8 million bottles sold. Repairs in minutes: create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and blocks in larger capacity engines, AG, RV etc. The only industrial coolant sealant university tested to meet ASTM D3147. Save time/money. Customer support: if our engine coolant leak doesn’t seal your head gasket, the system might be over-pressurized.

Us bestseller. Scientifically tested: safe and effective, it withstands the high pressure of the combustion chamber, our Heavy Duty Coolant stop leak repair seals leaks up to 1/32 of an inch! Once cured, without failing or clogging the cooling system. Pour and go: our cooling system sealer is easy to use just shake the bottle, it mixes with all types of antifreeze, add to your radiator/overflow and run the engine! Unlike some competitive products, no draining, flushing or pulling the thermostat required.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height1.9 Inches
Length5.9 Inches
Weight1.2 Pounds
Width4.1 Inches
Part NumberST5516
ModelST5516
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

4. BlueDevil Products

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BlueDevil Head Gasket Sealer 38386

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BlueDevil Products #ad - Safe and easy to use. Contains no solid or particulate matter that can harm a vehicles engine . Alternative solution for costly and time consuming repairs . Permanent Repair.
BrandBlueDevil Products #ad
ManufacturerBlueDevil Products #ad
Weight2 Pounds
Part Number38386
Model38386
WarrantyLIMITED WARRANTY

5. ATP Automotive

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8 Ounce Bottle, ATP AT-205 Re-Seal Stops Leaks

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ATP Automotive #ad - Rejuivinates all rubber seals & gaskets in engines, power steering, transmissions, differentials and hydraulic systems. Does not contain petroleum distillates, will not over-swell or breakdown seals. Compatible with conventional and synthetic oils, gear oil, ATF, power steering fluids and hydraulic oil. Professional strength fast acting resealer, stops leaks fast. 8oz bottle will treat a 6 quart capacity, adjust accordingly.
BrandATP Automotive #ad
ManufacturerATP #ad
Height4 Inches
Length7 Inches
Weight0.11 Pounds
Width4.5 Inches
Part NumberAT-205
ModelAT-205
WarrantyMoney Back Guarantee

6. Genuine GM

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Pack of 5, Genuine GM 12378255 Fluid 3634621 Cooling System Seal Tablet, 4 Grams

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Genuine GM #ad - For use with all vehicles. Formulated for automotive use. Dex-cool compatible. Engine application is based on liters of volume in cooling system. Non-toxic.
BrandGenuine GM #ad
ManufacturerGM #ad
Part Number12378255
Model12378255

7. Bar's Leaks

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

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Bar's Leaks #ad - Works with all types and colors of anti-freeze coolant. One bottle treats up to 4 gallons. Manufacturer: bAR'S LEAKS. Stops and seals coolant leaks. Country of manufacture: United States. Auto & truck Maintenance.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height5 Inches
Length1.6 Inches
Weight0.5 Pounds
Width2.4 Inches
Part Number1196
Model1196
WarrantyNo

8. Bar's Leaks

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

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Bar's Leaks #ad - Repairs blocks. Repairs blown head gaskets. Repairs freeze plug leaks. Repairs heater core leaks. Seals larger leaks seals.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.6 Inches
Length7.5 Inches
Weight1.3 Pounds
Width2.6 Inches
Part Number1109
Model1109

9. Prestone

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Prestone AS195 Complete Care and Stop Leak, 22 oz.

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Prestone #ad - Helps in just 1 treatment. Reduces friction and protects against corrosion. Also stops and prevents leaks in all major cooling system components. Formulated with patented Grafted Polymer Technology. Extends and protects water pump life.
BrandPrestone #ad
ManufacturerPrestone #ad
Height7.45 Inches
Length2.24 Inches
Width3.89 Inches
Part NumberAS195
ModelAS195

10. Bar's Leaks

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Bar's Leaks 1194 Radiator Stop Leak Concentrate, 6 oz.

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Bar's Leaks #ad - Works with all types and colors of anti-freeze coolant. Stops and seals coolant leaks. One bottle treats up to 3 gallons.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6.5 Inches
Length1.8 Inches
Weight0 Pounds
Width3 Inches
Part Number1194
Model1194
WarrantyNo