Best Heater Core Flush – Top 5 Picks In 2021

by Lindsey Carter

If you notice that your car isn't working as well as it used to, maybe it's time to check the heater core and flush it out. For those that don't know, a heater core is similar to a radiator; it transfers the heat from coolants over to the inside of the car.

You can find this system usually in the dashboard, and it helps warm up the passengers inside. Since this system goes inside the car, it also has a chance of leaking when problems ensue. When there are leaks, it could pose a potential issue in terms of cleanliness and heat transfer.

Checking the heater core system lets you know if there is coolant buildup or other problems. To get the job done, you'll need to get the best heater core flush in the market. This advice ensures that you properly dislodge and clean out unwanted sediments and keep the car running in top shape.

Top Heater Core Flush Picks by Editors

Summary Table for Best Heater Core Flush

Image Product Name Price

Lisle 60900 Heater Core Backflush

Lisle 60900 Heater Core Backflush

Price Check

OTC 6043 Multipurpose Cleaning Gun

OTC 6043 Multipurpose Cleaning Gun

Price Check

OEM 24506 Backflush Tool

OEM 24506 Backflush Tool

Price Check

Thexton 356 Backflush Tool

Thexton 356 Backflush Tool

Price Check

Thexton Heater Backflush Tool

Thexton Heater Backflush Tool

Price Check

5 Best Heater Core Flush Reviews

5 Best Heater Core Flush Reviews
5 Best Heater Core Flush Reviews

When choosing a tool or item for your car, always invest in the ones that can deliver high-quality service and have a long lifespan. The product should be able to make the overall process more comfortable and more convenient for all users.

1. Lisle 60900 Heater Core Backflush

Lisle 60900 Heater Core Backflush
Lisle 60900 Heater Core Backflush

This product has an industrial spray that makes flushing out more comfortable for users. The stepped tip design of the item is optimal for smaller pipes, thanks to reducing the hose's internal size. In turn, this kind of tip gives off the maximum flow.

Having maximum flow is perfect for thorough cleaning and flushing out of the accumulation and buildup of sediments in the car's system. One of the best things about this item is that you can easily control the water pressure.

Also, the handle of the product is insulated, making it safer, especially when using hot water to flush out the sediments. It easily attaches to the standard type and size of hose you can buy at your local hardware store.

The product manufacturers ensure that all their items, especially the flushers, are expertly handcrafted using only the best premium-grade materials. You can be 100% sure that the product is both functional and reliable and has a long life span. Check out the most essential automotive parts of Coilovers for Wrx.

Highlighted Features

  • There are three available sizes to choose from: ½", ⅝," and ¾"
  • You can easily control the water pressure, thanks to the handle
  • Each handle is insulated to avoid accidents when using hot water
  • The product easily attaches to the standard-sized garden hose
  • Made from 100% durable and high-grade materials
  • A stepped tip design for maximum water flow

2. OTC 6043 Multipurpose Cleaning Gun

OTC 6043 Multipurpose Cleaning Gun
OTC 6043 Multipurpose Cleaning Gun

This item is built for fast, effective, and efficient flushing. OTC is a manufacturer that specifically caters to the needs of almost all auto owners. The product is a result of professional and meticulous designs alongside hard work and persistence in creating quality results and items.

It's also very durable and efficient, which ensures that the overall user experience is excellent. You can be 100% sure that this product is 2nd to none because of the usage of 1st-rate, top-quality materials during production.

Users no longer have to worry about getting a product that easily damages or breaks.

OTC ensures that their items can last for many years. Durability is also one of the best things about the item, as it can withstand any form or type of pressure, damage, or wear and tear for a long time.

The product is also specially made to produce short, sharp vortex air/water blasts, which are proven effective to rid the pipes of sticky and hard to remove sediments. You may also make a reverse vacuum by turning the venturi (inside the gun) in the opposite direction.

Overall, this best heater core flush is also easy and convenient because you can attach it onto any standard sized garden hose. There are only two connections: one that connects to a water faucet, and the other one is to shop air. Don't forget to check the Top Glow Plugs For Duramax reviews.

Highlighted Features

  • Reusable for other purposes such as washing car engines or cleaning floors
  • The product design is specially made to make cleaning more comfortable and more convenient
  • Vortex air/ water blasts produce short but powerful water pressure that helps in thorough cleaning
  • This product doubles as a vacuum when users turn the venturi inside the gun in the opposite direction
  • Easy to assemble and use
  • You can easily control the amount of water pressure released

3. OEM 24506 Backflush Tool

OEM 24506 Backflush Tool
OEM 24506 Backflush Tool

This item is one of the easiest to use compared to others. All you have to do is remove the radiator cap and allow the coolant to drain completely. Proceed to remove the hoses connected to the engine itself and attach the product's stepped adapter onto the engine.

Connect the other end of the flusher to a water source and allow the water to flow. Once you open the faucet, water flows continuously through the heater core. Clear liquid indicates the cleanliness of the system.

One of the best things about this item is that owners can quickly adapt and use the product without difficulty.

There are no complicated instructions, nor are there additional parts that need assembling. You also immediately know about the status of the system's cleanliness by checking for liquid clarity.

The material itself is also made of non-corrosive aluminum, which means that the item is 100% protected from oxidation, which causes rusting and corrosion. This feature also ensures that the product won't quickly get damaged or destroyed when under different environmental factors and circumstances.

Lastly, the manufacturers of this product ensure that their clients only get items that are made of premium and quality materials that can last for a longer time than most brands. You may also like some of the top 80W90 Gear Oil from our list, so take a moment to check them out.

Highlighted Features

  • The material of the product is aluminum (non-corrosive)
  • Easy to use and assemble
  • Its hose fits different sizes: ½", ⅝," and ¾"
  • You may use a standard-sized hose to connect the product to the car
  • Indicators are convenient and easy to see and understand

4. Thexton 356 Backflush Tool

Thexton 356 Backflush Tool
Thexton 356 Backflush Tool

The product manufacturers have been delivering quality items to their consumers for many years, thanks to the innovative ideas and premium materials used. Thexton continuously delivers and caters according to what their customers need and want, making their products a favorite among others in the industry.

This item is made of aluminum, which is non-corrosive. It means that the product has a protective coating that, although extremely thin, protects against corrosion.

Thanks to the material used, you can be sure that the tool lasts for many years and is durable under any circumstance.

Users also have an easier time flushing out any unwanted sediments or gunk because of the easy installation of the backflush tool. All you have to do is remove the cap of the radiator and drain it of any coolant. Next is you remove the heater hoses attached to the car engine.

Place the stepped adapter to the car engine and the other end of the tube to the water supply. Determining if the system is clean is also 100% easy to do. Once you open the faucet or water source, wait for the fluid coming out to be clear and free of any discoloration. This indication helps you determine the heater core's status. For more amazing products like this, check out our guide to the Grease for U-Joints

Highlighted Features

  • Easy to use and install
  • It can fit any standard-type hose
  • The product can provide three different sizes: ½", ⅝," and ¾"
  • Made of non-corrosive aluminum
  • Users can quickly adapt and understand how the product works without difficulty
  • Material is 100% durable, efficient, and robust

5. Thexton Heater Backflush Tool

Thexton Heater Backflush Tool
Thexton Heater Backflush Tool

This item is designed to unclog heater cores by utilizing air or water pressure. Installation is easy, as you only need to locate the heater core and where the hoses attach. Get the backflush tool and connect one side of the tube. Drain the coolant and make sure there isn't material left before you start.

On the other end, connect the tool to a water source. The great thing about this item is that the ergonomic handle design allows users to control the water pressure entering the heat core system. It also fits three hose sizes: ½", ⅝" and ¾." This item is an excellent investment that many should try.

Also, you no longer have to purchase additional acids or solutions to clean out the heater core of the car. Because the air and water pressure of the product is enough. Some heater core systems, although easily cleaned with continuously flowing water, also require high pressure and short water blasts.

A combination of high pressure and short water blasts helps remove sediments and dirt thoroughly.

Highlighted Features

  • There is no need to use cleaning solutions or acids
  • Ease of use, ergonomic handle
  • Users can easily control water or air pressure
  • The small water blasts created by the handgun is enough to break down sediments
  • Can fit three hose sizes: ½", ⅝," and ¾"
  • Easy to assemble

Things to Consider Before Buying Heater Core Flush

Best Heater Core Flush
Best Heater Core Flush

Your car's heater core is one of the essential parts of the auto's cooling system. If there are problems or issues within this portion, it can be a cause for other severe problems in the future. That's why flushers are mostly used to maintain, clean, and unclog the hoses that connect to the heater core.

Here's what you need to know before buying:

Product Material

You must always ask about the product's material because this is one of the main factors that help determine its lifespan. Some items are made from hard, premium-quality plastic, while others are from non-corrosive aluminum. It all depends on your preferences.

Legitimate sellers and manufacturers will happily explain and answer your queries about the product's material.

Compatibility with Hoses

Having products that are compatible with a standard-sized hose makes the buying experience better and easier. Consumers no longer have to search far and wide for tools and equipment that are compatible with each other and especially the car engine.

As mentioned earlier, some of the key features are the sizes that the product is compatible with, as this is very important.

Ease of Use

An overlooked feature that some manufacturers don't give importance to is the ease of use. Sometimes, brands release items that look great but are, in reality, complex to understand and difficult to use. These elaborate designs make it hard for consumers to navigate and utilize the item overall.

Before you buy something (either in person or online), always make sure to ask about usability and if previous buyers had an easy time using it. These testimonials will help you decide whether you're willing to set aside time or quickly and easily use it.


If a product is convenient to use, it makes the overall experience more excellent. Some product designs are specifically made to help users have a more comfortable experience overall. An example is the ergonomic design of some handgun flushers, which allow full control of the water pressure.

Features like these, although not majorly relevant, contribute to the overall experience and usage. You should always ensure that the product is 100% convenient to use each time.

Product Manufacturers

There's no issue in trying to do a background check on the manufacturers. You should look at how many years they have been in the industry and the products they've released. The more years they have in both experience and equipment production, the more that you should look into the type of items that they sell.

FAQs : Frequently Asked Questions & Answers

FAQs : Frequently Asked Questions & Answers
FAQs : Frequently Asked Questions & Answers

For first-time buyers, there may be a lot of questions that not all sellers can answer immediately. Here some frequently asked questions that can help you when buying heater core cleaners for your car:

1. Will the water pressure damage the heater core of the car?

No, it won't. Some of the products have designs that can help you control the amount of pressure being released into the system, while others have a passive flow-like system that depends on the water source.

2. Is it true that I can easily attach the product to a garden hose?

Yes, you may do so. All items are designed to be 100% compatible with standard garden hoses that you can easily buy at your local hardware store.

3. Why can't I just use the garden hose to clean out the heater core?

These products are specifically made to fit inside small pipes and hoses. Using a simple garden hose might not get the job done. Also, garden hoses have more pressure than a backflush tool, which may potentially damage the system.

4. Which is better: those with hand grips or not?

It depends on your preferences. If you want to have more control over the released water pressure, go with the handgrips. However, you should know that both models work perfectly for unclogging and cleaning heater cores.

5. Is it okay to start cleaning while the coolant is still inside the tubes?

If you don't drain the coolant before using the products, it might cause problems, and overall, it won't be able to clean the system thoroughly.

Final Words

Remember that every aspect of the car is essential, no matter how irrelevant or unfamiliar it is for some people. Finding the best heater core flush is an excellent investment that can help you save money, time, and effort.

Now that you know which items are the best in the market, don't hesitate to take a step further and ensure the proper maintenance of your car by using these products.

About Lindsey Carter

Lindsey and Mike C. grew up in the same neighborhood. They also went to the same Cholla Middle School together. The two famillies from time to time got together for BBQ parties...

Lindsey's family relocated to California after middle school. They occasiotnally emailed each other to update what's going on in their lives.

She received Software Engineering degree from U.C. San Francisco. While looking for work, she was guided by Mike for an engineering position at the company Mike is working for. Upon passing the job interview, Lindsey was so happy as now she could finally be back to where she'd like to grow old with.

Lindset occasionally guest posted for Mike, adding other flavors to the site while helping diverse his over-passion for baseball.

Thoughts on "Best Heater Core Flush – Top 5 Picks In 2021"