---
product_id: 8435812
title: "Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz. | Safely and Easily Seal Leaks in Plastic, Aluminum and Metal Radiators, Heater Cores, Gaskets, Freeze Plugs"
brand: "bar's leaks"
price: "$32.13"
currency: USD
in_stock: true
category: "Bar's Leaks"
url: https://www.desertcart.us/products/8435812-bars-leaks-cooling-system-radiator-stop-leak-16-9-oz
store_origin: US
region: United States of America
---

# Stops leaks in freeze plugs, gaskets & heater cores Lowers engine water temperature effectively Seals leaks in plastic, aluminum & metal radiators Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz. | Safely and Easily Seal Leaks in Plastic, Aluminum and Metal Radiators, Heater Cores, Gaskets, Freeze Plugs

**Brand:** bar's leaks
**Price:** $32.13
**Availability:** ✅ In Stock

## Summary

> 🔥 Stop leaks before they stop you! 🛠️

## Quick Answers

- **What is this?** Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz. | Safely and Easily Seal Leaks in Plastic, Aluminum and Metal Radiators, Heater Cores, Gaskets, Freeze Plugs by bar's leaks
- **How much does it cost?** $32.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/8435812-bars-leaks-cooling-system-radiator-stop-leak-16-9-oz)

## Best For

- bar's leaks enthusiasts

## Why This Product

- Trusted bar's leaks brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy Application:** Simply add the liquid to your radiator—no mechanic needed, saving you time and money.
- • **Trusted Performance:** Ranked #4 in Fuel Leak Detectors with 4.3-star reviews from thousands of satisfied drivers.
- • **Universal Leak Sealer:** Works seamlessly on plastic, aluminum, and metal radiators for all your vehicle types.
- • **Multi-Point Protection:** Seals leaks in freeze plugs, gaskets, and heater cores to keep your engine running cool.
- • **Engine Temperature Control:** Lowers water temperature to prevent overheating and extend engine life.

## Overview

Bar's Leaks Cooling System Radiator Stop Leak (16.9 oz) is a powerful liquid formula designed to safely and easily seal leaks in plastic, aluminum, and metal radiators, as well as freeze plugs, gaskets, and heater cores. It helps lower engine water temperature, preventing overheating and costly repairs. Trusted by thousands, it’s a must-have for proactive vehicle maintenance.

## Description

AUTO_PART

## Features

- Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.
- Seals radiator leaks
- Seals freeze plug leaks
- Repairs gasket leaks

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002696FA2 |
| Best Sellers Rank | #7,226 in Automotive ( See Top 100 in Automotive ) #4 in Fuel Leak Detectors |
| Brand Name | Bar's Leaks |
| Color | Gray |
| Compatible Material | Aluminum |
| Customer Reviews | 4.3 4.3 out of 5 stars (3,839) |
| Global Trade Identification Number | 00046087011867 |
| Included Components | 1 Bottle |
| Item Dimensions | 1.8 x 3 x 6.6 inches |
| Item Form | Liquid |
| Item Type Name | Liquid Aluminum Radiator and Heater Core Stop Leak |
| Item Weight | 1.2 pounds |
| Manufacturer | Bar's Leaks |
| Material Type | Plastic |
| Model | 1186 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 1186 |
| Style Name | 1 Pack |
| Surface Recommendation | Miscellaneous |
| UPC | 046087011867 |
| Unit Count | 1 Count |
| Warranty Description | No |

## Product Details

- **Brand:** Bar's Leaks
- **Item Weight:** 1.2 pounds
- **Item dimensions L x W x H:** 1.8 x 3 x 6.6 inches
- **Material:** Plastic
- **Style:** 1 Pack

## Images

![Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz. | Safely and Easily Seal Leaks in Plastic, Aluminum and Metal Radiators, Heater Cores, Gaskets, Freeze Plugs - Image 1](https://m.media-amazon.com/images/I/710LVf+KX5S.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: My radiator leaking from the seam.  Slightly overheating.  Will this seal at the seam?**
A: It should,depending on how big the leak/crack is,the one on my semi truck was dripping big,half a gallon a day,I was worried bc that s a $2,000.00 repair,I bought it not expecting any results,since I had previously used Bars leak (the small silver bottle) and didn t work,so this was a prayer and a last hope, 5,000 mls later and not a leak,not extra coolant added,it is liquid aluminum,so it bonds to wherever the leak is and forms a sealing coat...I think of it as welding from the inside...I hope it works for you as it did for me,it really was an answer to prayer...I know I m a bit dramatic but it was.PS,try to follow recommended amount or as close as recommended,not much less and not much more,I used 2 bottles on a 11 gal radiator.God bless.

**Q: can it be used in a Tahoe plastic tank**
A: i used it in my volvo which has a plastic expansion tank and no problems. it won't fix big leaks but if you're losing just a little coolant over time and can't find the leak this is the stuff to use!

**Q: My volkswagen golf gti 2018 doesn’t have a radiator cap can i still put it in a coolant reservoir to seal my radiator leak?**
A: If direct access to radiator is not available, install in overflow tank. Please ensure overflow is pressurized before adding. 

DIRECTIONS

Allow engine to cool. Make sure engine is cool enough so radiator cap can be safely removed.
Shake well. Pour Bar’s Leaks Liquid Aluminum directly into radiator. One bottle treats systems up to 4 gallons. Use 1/2 bottle in 3 and 4 cylinder engines. TIP: If direct access to radiator is not available, install in overflow tank.
Fill radiator and overflow tank to proper level and reinstall radiator cap.
Drive/idle engine for 15 to 20 minutes. If leak continues, second application may be required or mechanical attention is needed. For severe leaks, like a blown head gasket, it is recommended to use Bar’s Leaks Head Gasket Fix or Blown Head Gasket Repair.
Leave Bar’s Leaks Liquid Aluminum in cooling system for continued protection.

If you have any other technical questions, feel free to contact our Technical Service Professionals at 800-345-6572 or if you would prefer you can use the contact us page on our website.

**Q: will this work on the head also?**
A: Try it...it's inexpensive.  Whether it works depends on the specifics of your problem.  I tried it on a 4 cylinder BMW with a new head and profile gasket and a slow leak.  It worked great.

## Frequently Bought Together

- Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz.
- PEAK 50/50 Prediluted Antifreeze and Coolant for All Engine Cooling Systems
- Bar's Leaks 1109 Liquid Copper Block Seal, Intake and Radiator Stop Leak, 18 oz. | One Step, Safe for All Cooling Systems

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-15*