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10 bestRadiator Leaksof December 2025

112M consumers helped this year.

15% off

1

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Polar Specialist Coatings

9.9

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2

DHA 18pcs Car Cooling System Radiator Pressure Tester Kit, Coolant System Radiator Cap Pressure Tester with Hand Vacuum Test Pump, Water Leak Detector Kit Radiator Reservoir Tank Cap

DHA 18pcs Car Cooling System Radiator Pressure Tester Kit, Coolant System Radiator Cap Pressure Tester with Hand Vacuum Test Pump, Water Leak Detector Kit Radiator Reservoir Tank Cap

DHA 18pcs Car Cooling System Radiator Pressure Tester Kit, Coolant System Radiator Cap Pressure Tester with Hand Vacuum Test Pump, Water Leak Detector Kit Radiator Reservoir Tank Cap

DHA

9.8

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3

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal

9.5

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4

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK

9.3

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5

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal

9.0

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OtherRelated productsUp to 10% off

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Fernox 61016 50ml LS-X External Leak Sealer

Fernox 61016 50ml LS-X External Leak Sealer

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

6

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

Generic

8.7

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7

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

ARZER

8.5

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8

Holts 1831469 Radweld Plus New Formula 250ml

Holts 1831469 Radweld Plus New Formula 250ml

Holts 1831469 Radweld Plus New Formula 250ml

Holts

8.2

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9

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

Liqui Moly

7.9

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23% off

10

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Heatlab

7.6

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