10 Best Coolant Leak Locations In The Us

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Last Updated - November 25, 2024

Best Choice

1

Clicked 22 times in the last month

K-Seal
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

9.5 Simple to use

8.4 worth the money

8.0 distance

Why we love it

No draining or flushing needed

Fixes cracks and leaks

Easy to use just shake, pour and go
Main highlights

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
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
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
FIX IT FAST: Our multi-purpose solution works in minutes to quickly & permanently seal leaks in the radiator, head gasket, freeze plugs, block, heater matrix & water pump of heavy duty vehicles. Fixes most leaks in water-cooled engines
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
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9.9

Exceptional

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Value for Money

2

Vansky
Vansky Air Conditioner Leak Detector: Professional Car Tool Automotive AC UV Dye Leak Detection Kit with Protective Glasses
Main highlights

What You Get: Provide Friendly, Easy-to-reach Support; If you have any questions or concerns about our products, please don't hesitate to contact us. Vansky AC Leak Detector Tool*1 (NOTE: AA Battery Not Included), UV Protective Glasses*1, User Manual*1.
Ultra-compact Design: Crafted from ultra-durable high-precision aluminum, it's resistant to wear and features a textured, non-slip grip handle. 7.1*3.7*2.8 Inches/9.9 Ounces; The compact-size, is advantageous for carrying with the vehicle. Its' portable design makes it ideal.
Professional AC Leak Detection: Designed specifically for detecting automotive air conditioner leak, Vansky AC leak detector flashlight incorporates cutting-edge R&D technologies. Equipped with 68 high-quality LED beads, it can accurately pinpoint leaks, even in garage or indoor space. Compared to other flashlights, Vansky optimized ultraviolet light operates at a level 40% brighter, setting it apart in brightness.
Premium UV Filter Glasses: Using the car AC leak detector tool in conjunction with glasses equipped with high-quality yellow-filter optical lenses can filter out foreign light from the environment, providing clearer and purer visibility of UV dyes undergoing fluorescence reactions. Simultaneously, it protects your eyes from UV exposure.
One Item - Multiple Uses: Compatible with all types of UV dye leak detection. For example, Car Oil Leak Detection, and more. (Note: UV Dye Not Included.) In just a few minutes, this leak detection tool can locate leaks that mechanics might overlook, enabling precise repairs and cost savings.
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9.8

Exceptional

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3

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

16% Off

9.5 Simple to use

8.9 worth the money

8.2 distance

Why we love it

Permanent fix for coolant leaks, saving costly repairs.

Versatile: Fixes multiple engine parts, not just radiators.

No draining required: Just shake, pour, and drive.
Main highlights

Permanent Coolant Leak Repair
K-Seal's unique formula seeks out holes and cracks, sealing them permanently without impacting engine cooling efficiency.

Versatile Usage Scenarios
Ideal for fixing leaks in radiators, head gaskets, freeze plugs, cylinder heads, heater cores, water pump casings, and engine blocks.

Ease of Use Highlighted by Users
Customers frequently praise its ease of use—just shake, pour, and go, with no need for draining or flushing.
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9.7

Exceptional

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4

ACDelco
ACDelco GM Original Equipment 10-5057 Engine Cooling System Tracer Dye - 1 oz
Main highlights

Fluorescent dye assists with visual leak detection to eliminate guess work
Easy method of leak detection to save on labor and speed up service
Designed to quickly pinpoint leaks in traditional coolant systems
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9.5

Excellent

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5

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

Use 1-Ounce Per Vehicle
Offers to Quickly Find Cooling System Leaks
Includes Synthetic U/V Leak Detection Dye
Features a Formula that is Detectable with any U/V Light
Engineered to Supercool' s Highest Standards
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9.3

Excellent

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6

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

9.1 Simple to use

8.9 worth the money

8.0 distance

Why we love it

Seals larger leaks

Repairs heater core leaks

Repairs freeze plug leaks
Main highlights

USE WITH ALL TYPES OF TRADITIONAL OR EXTENDED LIFE COOLANT: Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.
PERMANENTLY FIXES COOLING SYSTEM LEAKS: . One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUV’s and RV’s.
ONE STEP - POUR DIRECTLY INTO RADIATOR - EASY TO USE: Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the coolingsystem when used properly, no draining is required.
ANTIFREEZE COMPATIBLE - NO DRAINING REQUIRED: Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores and radiators.
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9.2

Excellent

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7

Bar's Leaks
Bar's Leaks High Mileage Cooling System Repair

36% Off

9.1 Simple to use

8.7 Temperature control

8.7 distance

Why we love it

Effectively stops cooling system leaks temporarily.

Compatible with all anti-freeze brands and types.

Premium formulation offers extended leak protection.
Main highlights

Stops Cooling System Leaks
Effectively stops cooling system leaks, compatible with all types of anti-freeze, and features a premium carbon fiber formulation for extended protection.

Ideal for Temporary Fixes
Best for providing temporary fixes to minor radiator leaks, buying time until a permanent repair can be made.

Ease of Use and Effectiveness
Customers praise its ease of use and effectiveness in stopping leaks temporarily, saving money on immediate repairs.
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9.1

Excellent

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8

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

8.7 worth the money

8.7 Simple to use

Why we love it

Effectively seals leaks, even larger ones temporarily.

Conditions and strengthens the entire cooling system.

Inhibits rust, corrosion, and lubricates water pump seals.
Main highlights

Seals and Conditions
Seals leaks, conditions cooling system, inhibits rust and corrosion, lubricates water pump seals, helps control electrolysis.

Ideal for Temporary Fixes
Recommended for sealing minor radiator leaks, temporary coolant loss prevention, and aiding water pump gaskets until permanent repairs can be made.

Highly Praised for Leak Sealing
Customers frequently praise its ability to effectively seal leaks, making it a reliable temporary solution for radiator and coolant system issues.
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8.9

Very Good

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9

ACDelco
ACDelco 1149328 GM Original Equipment 10-5046 Dex-Cool Leak Detection Tracer Dye - 1 oz
Main highlights

Works in conjunction with the ACDelco Ultra Violet (UV) Leak Detection Lamp Kit
Special formula will not change the color of the coolant
Fluorescent dye assists with visual leak detection to eliminate guess work
Designed to quickly pinpoint leaks in cooling systems that use DEX-COOL (orange) coolants
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8.8

Very Good

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10

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

9.9 Simple to use

8.9 Temperature control

8.2 worth the money

Why we love it

Seals leaks quickly and effectively, saving costly repairs.

Compatible with various cooling systems, including aluminum engines.

Prevents damage to the combustion chamber from coolant leaks.
Main highlights

Seals Leaks Immediately
LIQUI MOLY Radiator Stop-Leak completely seals such leaks immediately with ease, securing the combustion chamber from damages caused by coolant admission.

Ideal for Aluminum Engines
Highly recommended for aluminum engines, suitable for all cooling water and heating systems with and without water filters.

Effective Leak Prevention
Customers praise its ability to stop leaks quickly and effectively, with no adverse effects on engine temperature or thermostat.
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8.7

Very Good

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