WhichOne › DIY store & garden › heating › heating system › radiator › radiator leak repair car

The best radiators leak repair car in comparison

Guaranteed independent and reliable
Millions of satisfied users every year
Last updated on 05.05.2025

Filter

Sort

Filter:Brand:Reduced items only:

Best choice

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

K-Seal

free shipping

show more show less

9,9

Check price

Show on Amazon

Features

EASY TO USE K-Seal couldn't be simpler & requires no draining or flushing; just shake, pour & go - shake the bottle, add the fluid to your coolant system & run your engine as normal.
STOP HOLES & CRACKS With 1 step our unique formula will seek out each hole & crack, permanently sealing them, without any adverse impact on the efficiency of your engine cooling.
HEAVY DUTY PERFORMANCE Engineered for large engines & industrial use; suitable for commercial or agricultural vehicles. A permanent repair for the lifetime of the engine. Compatible with all types of antifreeze coolant.
PROFESSIONAL-GRADE RELIABILITY Trusted by mechanics, our non-corrosive sealer delivers a durable & long-lasting repair, without clogging your cooling system. A cost-effective solution to engine coolant leaks, enhancing the reliability & performance of your vehicle s cooling system. We've sold millions worldwide & are independently verified by university testing to meet ASTM D3147.

£ 22.99

£ 20.90

Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml

Wynn's

3% off

free shipping

show more show less

9,8

Check price

Show on Amazon

Features

VERSATILE APPLICATION FOR PETROL, DIESEL, AND LPG ENGINES Ideal for all "water" cooled systems, this sealant is suitable for a wide range of engine types, including petrol, diesel, and LPG. It is recommended not only for repairing minor leaks but also as a preventive solution to avoid potential issues before they escalate into costly repairs. By reinforcing the integrity of the cooling system, this product helps maintain vehicle reliability and performance under various driving conditions. Whether used for routine maintenance or emergency repairs, it offers an effective and lasting solution for cooling system leaks.
PREVENTS CLOGGING AND ENSURES TEMPERATURE SENSOR ACCURACY Unlike some sealing products that can lead to buildup and reduced efficiency, this formulation is designed to avoid clogging radiator waterways and temperature sensors. By maintaining proper coolant flow and accurate temperature readings, this product ensures that the engine operates within the ideal temperature range, preventing overheating or inefficiencies. Its compatibility with various antifreeze and coolant types makes it a versatile and reliable choice for ongoing maintenance and preventive care.
ENHANCED PROTECTION AGAINST CORROSION AND RUST Offering more than just leak prevention, this product also provides enhanced protection against corrosion and rust. Exposure to heat, moisture, and coolant chemicals can lead to internal corrosion, weakening the system and leading to expensive repairs. This advanced formulation actively protects metal components from rust and corrosion, helping to maintain engine efficiency and prolong the lifespan of the cooling system. Its compatibility with OAT (organic acid technology) fluids and all standard antifreeze products ensures easy integration into any system.

£ 6.29

£ 8.79

Holts Sealit Leak Repair 250ml, (Packing May Vary)

Holts

12% off

free shipping

show more show less

9,8

Check price

Show on Amazon

Features

Mixes with all types and colours of antifreeze coolant
Easy to use, simply pour and go

£ 11.49

£ 14.01

£ 14.59

£ 15.59

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

DHA

free shipping

show more show less

9,5

Check price

Show on Amazon

Features

This radiator pressure testing kit is easy to test the leakage of the radiator system and the quick replacement of the coolant. With this pressure tester, you can do your job with ease. It will be a good helper in your daily life.
The cooling system tester kit has a pressure gauge with a rubber protective sleeve and a pressure relief valve. It includes a universal cooler that can be used for radiators in most cars, SUVs and light trucks.
Pressure range 0-35 psi 0-2.5 bar with pressure release valve and quick coupler

LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178

Liqui Moly

show more show less

9,5

Check price

Show on Amazon

Features

Used for sealing small leaks in cooling circuits of passenger motor vehicles, commercial vehicles and buses. Also suited for cooling water circuits equipped with water filters.
Contents will treat up to 40 liters of coolant.
Small leaks caused by stone impacts, porous soldering points and hairline cracks in the cooling simple are easy to localize (one notices that the cooling water level is sinking).
Shake container before use. Start up the heater. With the engine running, pour the contents into the coolant at operating temperature and allow the engine to continue running for at least a further 10 minutes.

Recommendation

LXNEER 18pc Cooling System Radiator Coolant Pressure Tester Kit with Hand Pressure Pump, Engine Coolant Pressure Test Kit Water Tank Leak Detector Tester Tool for Cars Trucks SUVs

LXNEER

free shipping

show more show less

9,4

Check price

Show on Amazon

Features

The radiator pressure test tool uses aluminum pump cylinder rather than plastic one, 21.2" rubber nylon resin hoses, brass fittings, solid and durable. 3" large dial gauge with index range 0 to 35psi (0 to 2.5bar), easy to observe. Chrome plated brass quick coupler with relief valve, can be connected to radiator adapters easily and quickly.
Radiator pressure test car water leak tank detector tester pressurize on the reservoir, and watch for pointer drop over time to confirm system leak down. If there is any crack in the cooling system, the water in the tank will leak out under pressure, shows the fracture position, such as the tank, hose, a loose connection, etc. Check regularly, repair promptly, avoid leak result in the reduction of coolant and boiling point, cause high engine temperature, low oil viscosity and other serious problem
Include durable exact size of nylon testing caps, rust-proof copper connectors, clear gauge reading, high-quality rubber and metal adapters all included in one red molded case, easy to organize, use and carry
1 x Pressure testing pump with gauge 1 X Thermometer 3 X Chromed Steel Cap Adapters 10 X Anodized Cap Adapters ; 2 x Connector; 1 x Adapter Handle; 1 X Carrying Case

DASBET 18PCS Radiator Pressure Leakage Tester Tool Kit, Automotive Cooling System Water Tank Leak Test Detector Set with Hand Pump and Nylon Adapters

DASBET

free shipping

show more show less

9,4

Check price

Show on Amazon

Features

Hand Pump Leak Detector The radiator pressure test tool uses aluminum pump cylinder rather than plastic one, 21.2" rubber nylon resin hoses, brass fittings, solid and durable. 3" large dial gauge with index range 0 to 35psi (0 to 2.5bar), easy to observe. Chrome plated brass quick coupler with relief valve, can be connected to radiator adapters easily and quickly.
Leak Detection Tool The hand pump leak detection tool pressurize on the reservoir, and watch for pointer drop over time to confirm system leak down. If there is any crack in the cooling system, the water in the tank will leak out under pressure, shows the fracture position, such as the tank, hose, a loose connection, etc. Check regularly, repair promptly, avoid leak result in the reduction of coolant and boiling point, cause high engine temperature, low oil viscosity and other serious problem.
Easy to Use Remove the original radiator cap, choose an available radiator cap from the test kit and install it on radiator opening. Work the handpump till the pressure up to 10-15psi (Avoid up to 35psi). Check the gauge reading, if the reading drops automatically, it means that the leakage might occur in radiator. Please inspect the radiator system and repair it if necessary. Normally, it takes around 10mins to test leak, very easy and fast to operate.
Wide Application Coolant system leak checker tool set is equipped with 3 specific aluminum adapters and 10 nylon adapters , solid and durable, widely compatible for Mercedes (W123, W126, W124, W201), GM(Buick), Jeep Peugeot, Subaru, Chrysler, Acura, GM(Nova, Spectrum, Sprint), Mitsubishi, Nissan, Mazda, Toyota, Infiniti, GEO, Suzuki, Isuzu, Mercedes Honda, Toyota, Suzuki, Mitsubishi, Chrysler, Acura.
Package Included 1 x Pressure testing pump with gauge 1 X Thermometer 3 X Chromed Steel Cap Adapters 10 X Anodized Cap Adapters ; 2 x Connector; 1 x Adapter Handle; 1 X Carrying Case.

Granville Genuine 1 X Petro Patch Putty 50g Multi Purpose Metal Repair Leaks Car Sealant - Part Number 455

okoium

3% off

free shipping

show more show less

9,3

Check price

Show on Amazon

Features

Premium Product

5in1 Radiator Stop Leak 310ml

5in1

show more show less

9,2

Check price

Show on Amazon

Features

Added corrosion inhibitors

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

Generic

free shipping

show more show less

9,2

Check price

Show on Amazon

Features

No flushing. Just shake, pour and go.
Multi Purpose ONe Step & Permanent
WILL BE DISPATCHED SAME WORKING DAY IF ORDER PLACED BEFORE 2PM. YOU WILL RECEIVE IT NEXT WORKING DAY

This ranking is created through algorithmic analysis of millions of products tailored specifically to your search. We aim to find the most suitable product for you based on manufacturer information and price. The ranking reflects our opinion and should serve as a good starting point for your purchase. We would like to point out that we have not tested the products ourselves and link to selected online shops and partners from which we may receive compensation.

You might also be interested in these radiators leak repair car.

Granville Ce-Lit Radiator Stop Leak Cement Sealant Powder (1)

Granville Ce Lit Radiator Stop Leak Cement Sealant Powder 1

Check price

Bars Powdered Radiator, Engine Block and Gasket Leak Sealant 15 gr

Non-corrosive and non-clogging.

Check price

Kudos-Trading - Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g Plumbers Pipe Fitters DIY plumbers mait

Non-toxic and environmentally friendly the fernox Ls-X external leak sealer is a non-toxic and eco-friendly solution, ensuring that it does not harm the environment or pose any health risks to humans or animals.

Check price

ADHES Waterproof Tape Butyl Tape Aluminum Foil Tape Sealan Tape Outdoor Use, 10cm x 5m,for RV Repair, Window, Silicone, Boat and Pipe Sealing, Glass & EDPM Rubber Roof Patching, Silver

High Environmental Adaptability AHDES butyl tape aluminium foil tape is adapt to most kinds of weather. Work well on metal, tiles, shingle, aluminum, galvanized steel, gypsum board, wood, fiberglass, brick, concrete and etc. Your ideal tool for Home, Auto, Outdoors and etc.

Check price

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

Peace of Mind With Permatex Radiator - Stop Leak, You Can Drive With The Peace of Mind Knowing That Your Engine is Protected, and Your Car is Running Smoothly.

Check price

Polar TapeSeal Clear - 4" x 5 ft | Rubberised Waterproof Tape for Leaks & Cracks on Roofs, PVC Pipes, Downpipes, Plumbing & Gutters | All-Purpose Indoor & Outdoor Sealant Tape for Lasting Protection

Easy to Use Simply apply our rubber tape to stop leaks in hard-to-reach areas including holes, cracks, gaps, and tears. Clean the surface, remove any dirt or debris, and ensure the area is completely dry before firmly applying the tape directly to the affected spot for a secure and effective seal

Check price

Carlube Radiator Sealer 500ml – Fast Leak Repair, Prevents Future Leaks, Safe & Compatible with All Antifreeze

FAST LEAK REPAIR Carlube Radiator Sealant quickly repairs leaking radiators, providing an immediate solution to prevent further damage and coolant loss.

Check price

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

ARZER

free shipping

Check price

Tetrion Make Good Fix a Leak 400ml

Easy-to-use aerosol format, high build, tough, and flexible. Seals fine leaks & cracks and can be overpainted.

~~£ 9.99~~

Check price

AMK® Holts Sealit Coolant Leak Repair Stops Radiator Head Gasket Engine Block Leaks Permanently Antifreeze Compatible Fast Acting

AVOIDS COSTLY REPAIRS By providing a permanent seal, this product can help you avoid expensive mechanical repairs, such as head gasket replacement. Offers great value for money.

free shipping

Check price

J-B Weld 2110 Metal Fuel Tank Repair Kit, Gray

Tank Weld Our Metal Fuel Tank Repair Kit Has All You Need For Making Professional Quality, Permanent Repairs With State Of The Art Components And Easy To Follow Instructions.

free shipping

Check price

Sealpro ProSeal 62020 Instant Gas Tank and Radiator Repair

Good Quality

free shipping

Check price

The best radiators leak repair car in comparison

Guaranteed independent and reliable

Features

Features

Features

Features

Features

Features

Features

Features

Features

Features

You might also be interested in these radiators leak repair car.

Our offer