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10 bestHeater Core Leak Sealantof June 2025

112M consumers helped this year.

1

K-SEAL Coolant Leak Repair, ST9501 472ml Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, Freeze Plug - Pour and Go - Designed for Canadian Market
K-SEAL Coolant Leak Repair, ST9501 472ml Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, Freeze Plug - Pour and Go - Designed for Canadian Market

K-Seal

9.8

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2

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

Bar's Leaks

9.6

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3

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

K-Seal

9.4

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4

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

K-Seal

9.2

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5

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

Bar's Leaks

8.9

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Prestone AS145 Radiator Sealer Stop Leak - 11 oz.

Prestone AS145 Radiator Sealer Stop Leak - 11 oz.

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

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

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ABRO Ultra Plus 999 RTV Silicone Sealant and Gasket Maker, for Import Engines, Sensor Safe, Non-Corrosive, High Temp Silicone Sealant/Head Gasket Sealant, 650 Degrees F, 3 oz. Tube - Red

ABRO Ultra Plus 999 RTV Silicone Sealant and Gasket Maker, for Import Engines, Sensor Safe, Non-Corrosive, High Temp Silicone Sealant/Head Gasket Sealant, 650 Degrees F, 3 oz. Tube - Red

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A-Premium HVAC Heater Core Compatible with Acura RSX 2002-2006 & Honda Civic 2002-2005, 2.0L, Replace OE# 79110-S5D-A02, 79110S5DA02

A-Premium HVAC Heater Core Compatible with Acura RSX 2002-2006 & Honda Civic 2002-2005, 2.0L, Replace OE# 79110-S5D-A02, 79110S5DA02

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17% off

6

Rectorseal 45309 AC Freeze PRO Nano Mini-Split Leak Sealer, Blue
Rectorseal 45309 AC Freeze PRO Nano Mini-Split Leak Sealer, Blue

Rectorseal

8.6

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7

Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132
Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132

Liqui Moly

8.3

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9% off

8

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

Bar's Leaks

8.1

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9

Bar's Leaks 1194 Grey Radiator Stop Leak - 6 oz.
Bar's Leaks 1194 Grey Radiator Stop Leak - 6 oz.

Bar's Leaks

7.8

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10

Rectorseal 45308 AC Freeze PRO Nano Mini-Split UV Leak Sealer, Yellow
Rectorseal 45308 AC Freeze PRO Nano Mini-Split UV Leak Sealer, Yellow

Rectorseal

7.5

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