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Car Care

Radiator Leaks

10 Best Radiator Leaks 2025 in the United States

Name: K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
Brand: K-Seal
Price: 12.45 USD
Availability: InStock

From leading brands and best sellers available on the web.

Innova 3612 Compression Tester - 4 Piece Kit

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Winner

K-Seal

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

9.9

score

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Innova 3612 Compression Tester - 4 Piece Kit

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BILITOOLS

BILITOOLS Radiator Coolant Pressure Tester & Vacuum Refill Kit, 28-Piece Universal Cooling System Radiator Leak Tester & Refiller

9.8

score

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HZAUTOS

HZAUTOS 14PCS Pressure Leak Tester Tool Kit, Radiator Pump Pressure Tester Kit for Automotive Cooling System Water Tank Leakage Detection

9.5

score

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K-Seal

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

9.3

score

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J-B Weld

J-B Weld 2120 Radiator Repair Kit

9.0

score

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Bar's Leaks

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

8.7

score

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Bar's Leaks

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

8.5

score

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ACDelco

ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g

8.2

score

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TSI Supercool

TSI Supercool Synthetic U/V Leak Detection Dye, 1 oz, 1 Application

7.9

score

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#10

Liqui Moly

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

7.6

score

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10 Best Radiator Leaks 2025 in the United States

Innova 3612 Compression Tester - 4 Piece Kit

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

Innova 3612 Compression Tester - 4 Piece Kit

BILITOOLS Radiator Coolant Pressure Tester & Vacuum Refill Kit, 28-Piece Universal Cooling System Radiator Leak Tester & Refiller

HZAUTOS 14PCS Pressure Leak Tester Tool Kit, Radiator Pump Pressure Tester Kit for Automotive Cooling System Water Tank Leakage Detection

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

J-B Weld 2120 Radiator Repair Kit

Bar's Leaks High Mileage Cooling System Repair

Permatex 30301 Radiator Repair - Stop Leak, 16 fl oz, Protecting Against Coolant Loss, Stopping Leaks and Seepage from Head Gaskets

Super Glue Pro Seal N62020 Instant Gas Tank and Radiator Repair

BlueDevil Products 00205 Radiator & Block Sealer - 16 Ounce

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

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

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

ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g

TSI Supercool Synthetic U/V Leak Detection Dye, 1 oz, 1 Application

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

Cpu Radiator

Clean Radiator

Stop Leak For Radiators

Radiator Leak Sealer

Radiator Stop Leaks