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Mazda 3 Coolant Tank Overflow Bottle BK BL BM BN 2003-2018 4 Cyl

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Brand New Coolant Tank to suit Mazda 3 Models between 2003-2018. This particular bottle suits many variety of cars as Mazda did not change the design through the years. This product includes Free Express Postage, and a Free Online Tutorial Installation video on our website. 3 Year Warranty

2003 2004 2005 2006 2007 2008 2009 2010 BK BL BM
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Postage and Handling FAQ

Through to your registered email you will receive an order confirmation message. Within this section you will find that there is a button labeled ‘Track” which you can press to be taken to the official Australia Post website. If you cannot see this message, check junk mail.

If it’s just the suburb, do not worry. Our software will automatically assure the delivery address is rectified before sent.

Head over to our postage time chart page to get a rough idea of postage times Australia Wide.

International post times should be by inquiry for now. 

We ship to All Cities, States and Suburbs Australia Wide. 

Yes. Local pickup is available between 7:30-5pm Monday to Friday. 

Head over onto the product page of the part you desire and double check it DOESN’T say ‘On Backorder’. If it doesn’t, we have it in stock on hand ready to go! 

We are same day ship away! Order before 4pm and we will post it that day. 

Everything is shipped from within Australia! 

Aramex, TNT, Sendle upon request. 

See our Return Page for details regarding returns.

Free Postage. Express Postage costs flat rate of $12 and $22 for large dimension.

Send us an email in response to your original order confirmation! This is a direct email to our team who will be happy to help!

No. We do not require signature on our parcels. You can request that we request that feature. 

Yes, but not to all countries as of June 2021. 

Other Questions

Head over to our Installation Tutorials Page to find your video.

If we do not have a video for you, its likely we have not caught up with videos relative to our product list growth. Stay Tuned

Warranty and Returns

3 Years on Regulator Parts (Not Performance). See Product Warranties for a breakout on an individual level. 

Yes. In order to qualify for the 3 Year Warranty the correct precautions must be taken when fitting or installing our items.

The maximum length of time required to accurately determine warranty specifics is 7 days. Most are completed within 3 business days. 

We are. Any item damaged during delivery from us to you is accounted for by us. We will send you out a replacement free of charge!

Yes. Returns are accepted within 30 days of the item being received. 

This comes down to the reasoning behind the return. 

If the customer changes his mind, he/she pays return costs.

If the part is the incorrect fit, due to an error on the website or alternative sources then we pay the freight.

If the customer orders the incorrect part due to improper research and/or diligence then he/she pays return freight costs. 

Send us an email in response to your original order confirmation! This is a direct email to our team who will be happy to help!

If you are a private customer, and you sell the car, the warranty is not transferable to the other party.  

Yes. If you are buying the part on behalf or for a customer’s car, they are eligible to maintain the part warranty. They will have to use your shop in the future if they choose to persure the warranty 

Car Part Questions and Quality 

China and Vietnam! The majority of our products are developed in China or Vietnam! In our eyes, each country has its own strengths and weaknesses and we are are aware of them. We thoroughly test many manufacturers in order to find the ones that develop up to our standards.  

Yes! But not with a quick turnaround. We allow customers to input ideas for products to develop via our Recommend a Part Page 

Contact us and we will determine the best cause of action. Usually, we work with the customer assisting them to either come up with an alternative solution of full return for a refund. 

We do not directly operate against part numbers. We believe that part numbers aren’t always the most important determining factor for product selection. A more personal experience where we tell you exactly what fits every time 

Because we are direct to consumer! Most Manufacturers sell to a middle man, who then directs it to a shopfront. As we do not have a ‘shop front’, we chose to operate direct to consumer saving money for our customers. 

Yep! We navigate through the different levels of manufacturing quality, selecting and refining our product list. This assures we have a good balance off price/quality for our customers. 

Mazda 3 Coolant Tank Overflow Bottle BK BL BM BN 2003-2018 4 Cyl

Brand New Coolant Tank to suit Mazda 3 Models between 2003-2018. This particular bottle suits many variety of cars as Mazda did not change the design through the years. This product includes Free Express Postage, and a Free Online Tutorial Installation video on our website. 3 Year Warranty


Free Postage

Add to Wishlist
Add to Wishlist


Benefits of Shopping at Parts Factory Australia

Mazda 3 Coolant Tank

Mazda 3 Overflow Bottle

Customers reviews

What people say

Google Rating (June 22')
Paula Solway
Paula Solway
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Was extremely happy with these guys, they were so helpful and explained everything to me. I am not familiar with cars or car parts and they didn't try to rip me off, explained everything and made me feel comfortable. 100% suggest giving these guys your business.
Local Guide.
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I got the Hyundai boot latch. Came quickly, I wasn't sure about the tracking but I called the number and the bloke said there was a snafu with a delivery to him. Paid Sunday night, shipped wed, received Thursday. Installed today, working very well from 2 - 3 open close tests. Thanks!
Lucy McVie.
Lucy McVie.
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As a female buying car parts is the last thing I want to do, however I gave these guys a call and told them the problem and they had the parts delivered to my door in 3 days. Couldn’t recommend higher!
Michael Ranieri
Michael Ranieri
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Quality products at affordable prices. Happy to support Australian business 👌 returning customer 👍
Todd bilton
Todd bilton
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reasonable product .no pop rivets included for speaker relocation foam trim around edge of panel came instructions in box but watched YouTube video so no problem.
Gary T.
Gary T.
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The instructional video greatly assisted with the installation. Very straightforward and easy to follow.
Melissa Barclay
Melissa Barclay
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Easy to order, SUPER fast (free express) delivery, quality product and super helpful installation video! Thanks heaps!! ( I wouldn't have put off fixing my car if I'd known it was so easy to do so!)
Sean Cooney
Sean Cooney
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Awesome service, had my part in a couple of days, it was exactly what I ordered and they were super easy to deal with. Highly recommend them and I will use them again without a doubt. P.S. my part would have been $2,300 through the dealer but was $400 from these guys, unreal 😍
John Doe
John Doe
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fit perfectly on my sons car, so I order the other side door handles to match.

Supplier Quality Control

Built to O.E.M Specification & Mandatory Standards.

Our Quality Aftermarket parts are sourced by our Parts industry experts. We confirm all Aftermarket parts fit, form and function by in-house testing next to the Genuine parts before sale. Buy with confidence with our 30 day return policy. Our Aftermarket range represents great value.

We guarantee that all car parts sold through Parts Factory Australia are covered under a minimum 3 Year Replacement Warranty *Unless discussed otherwise*. We guarantee that our car parts are of high quality, and are not remanufactured goods or parts not up so Australian Standard Quality. More information regarding our Warranty Policy can be found here.

Postage will be within appropriate times based on the buyers location. Express Shipping is offered Free on most items under 500 grams, with Express Postage on items heavier then this available on checkout. More details regarding postage information can be found here.

We select Eco-Friendly Manufacturers that have certification to prove so. This is inline with our efforts to ‘save the world ‘ as explained here

DIY Installation Video Included 

Our Mission is to Save you Money, and Educate you in the Process.

Mazda 3 Coolant Tank

Mazda 3 Coolant Tank

Purchasing this Mazda 3 Overflow Bottle through us may save you $185 on the part, and $100 on labour expenses otherwise charged by a mechanic. 

Meet Our Staff

Byron G.

Store Manager

4th Year Mechanical Repairs Apprentice. Extensive Auto Electrician Knowledge. Studying Bachelor of Business. Favourite Car: Mclaren P1.


Replacing Old Mazda 3 Coolant Reservoir and Lower Engine Heat

Though the coolant reservoir is a tiny plastic tank that holds the coolant for your car’s engine, it plays an important role in maintaining the engine’s temperature as required. The Mazda 3 Coolant Reservoir helps cool down the heated engine body as the coolant tank help absorb and expel the coolant to bring down the engine heat. Parts Factory Australia has earned the title of best parts site for cars, vehicles and automobiles. We have been serving the Australian automobile sector for over three decades.

Is your Mazda 3 Engine Coolant Keep Disappearing?

When your car’s coolant is at its proper level, it travels in a continuous loop from your engine to your radiator and back, keeping your system cold in the process. You’ve got a cooling system problem if it’s going somewhere else. Sometimes you’re lucky enough to notice a visible leak or similar problem, but other times your coolant appears to vanish into thin air. If this has been happening to you, you must consider the following things.

Examine for Any Leak

Sometimes warning symptoms, such as steam beneath the hood or odd droplets on your garage floor, indicate a coolant leak, but not always. A little fractured line, a tiny hole in your radiator, or a water pump problem might all cause your engine coolant to disappear. It’s also conceivable that a coolant leak could occur inside your car or that your defroster will simply evaporate into mist.

Examine the Reservoir Cap

If there is no evident indication of leakage, a defective reservoir cover might be the source of the problem. The radiator cap helps manage pressure inside your cooling system by channelling part of your coolant into an overflow tank. If the cap fails or develops problems, it might allow too much coolant to be released too rapidly, resulting in an overflowing reservoir and suddenly missing engine coolant. Look for the following indicators:

  • Radiator tubes that have burst or collapsed
  • White streaks on your radiator (produced by leaking and drying coolant)
  • A reservoir that is overflowing or otherwise malfunctioning
  • An engine that is overheating

Examine Your Head Gasket

Overheating your engine might cause problems with your head gaskets. Coolant can enter your cylinders and be lost through your exhaust system if your head gaskets have blown or otherwise gone faulty. Signs that this is occurring include:

  • Oil had a whitish, hazy, or milky appearance
  • Your tailpipe is leaking water.
  • White smoke is flowing from your exhaust.
  • The presence of a bubbling effect in your coolant reservoir, radiator, or both
  • Engine power reduction (a possible result of low cylinder compression)
  • An engine that is overheating
  • Radiator blockages and other problems that may limit efficient flow throughout your cooling system might also cause you to wonder

Monitor Coolant Color Regularly

Whether or not you believe you have a problem with your cooling system, it is critical to maintain a careful check on your coolant levels at all times and ensure they remain at appropriate levels. Consult your owner’s handbook for servicing suggestions, such as coolant flushes, and follow them exactly. This will guarantee that problems are identified as soon as possible, ideally before they grow into major difficulties requiring costly repairs.


Part Numbers (See Below)

Main Part Numbers: MBN-34300

Any other Recorded Part Numbers: May be many other numbers.

Comments on Part Number Importance: Simply confirm your car is the car mentioned in our title, and compare the bottle physically.








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This Part Fits the Following Vehicles:

Any car displayed below, is compatible with this part.

Mazda320032.0 L MZR L I4 (gasoline)
Mazda32004 - 20082.0 L MZR L I4 (gasoline)
Mazda32009 - 20102.0,2.3T
Mazda32013 - 20172.0 L SkyActiv-G PE-VPS I4 (gasoline)
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