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Coolant expansion bottles

Shop coolant expansion bottles and radiator overflow tanks designed to support reliable cooling system performance. Find quality replacement parts for a wide range of vehicles.

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Find quality coolant recovery bottles

Natrad offers quality coolant overflow tanks for a wide range of vehicles. Whether you’re replacing a cracked, leaking or worn component, our dependable replacement parts are designed to support proper coolant management and reliable cooling system performance. Backed by Australia’s cooling system specialists, Natrad helps you confidently find the right solution for your vehicle.

A translucent white plastic vehicle coolant reservoir tank with a ribbed orange cap, isolated on a plain white background.

Why choose Natrad?

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Cooling system specialists

Experts in radiators and cooling systems.

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Australia-wide network

Over 40 locations across Australia.

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Extensive parts range

A wide range of cooling system parts.

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Trusted quality and expertise

Quality products for reliable performance.

What our customers say

5 stars

“Very professional staff. The work was carried out as required, and the cost ended up less than the quoted amount. The staff at Natrad Fyshwick clearly explained the warranty and the annual inspection service. Also arranged complimentary transport to work for me, very happy.”

harper

S. Harper
Natrad Fyshwick

5 stars

“After taking my 2007 Commodore back to the Holden dealer many times and being told that the air conditioner was fine, I finally got some good advice to take it to Natrad at Eaglehawk. They were fantastic, and I’m sure the amount of time they spent on it didn’t reflect in the final bill. I feel like I have a new car. I am now telling anyone who will listen that if they have any air conditioning problems, Natrad Eaglehawk is the place to go. Thanks, Glenn and the team.”

jones

L. Jones
Natrad Eaglehawk

5 stars

“Excellent service. A thorough inspection of the air conditioning in my car and the problem was solved virtually straight away. So impressed the staff at Natrad Raymond Terrace picked up the problem (something my mechanic had inadvertently done), and it didn’t cost a fortune to fix. Will only ever go here in future. Thanks, guys.”

unicomb

J. Unicomb
Natrad Raymond Terrace

5 stars

“After taking my 2007 Commodore back to the Holden dealer many times and being told that the air conditioner was fine, I finally got some good advice to take it to Natrad at Eaglehawk. They were fantastic, and I’m sure the amount of time they spent on it didn’t reflect in the final bill. I feel like I have a new car. I am now telling anyone who will listen that if they have any air conditioning problems, Natrad Eaglehawk is the place to go. Thanks, Glenn and the team.”

jones

L. Jones
Natrad Eaglehawk

FAQs


  • What does a coolant overflow tank do?

    A coolant overflow tank stores excess coolant as temperatures rise and returns it to the radiator as the system cools. This coolant is typically a mixture of water and antifreeze, helping maintain proper fluid levels and cooling system pressure.

  • What are the signs of a coolant overflow tank leak?

    Common signs include a visible coolant leak, low coolant levels, overheating and coolant residue around the tank. Replacing a damaged coolant overflow tank can help prevent cooling system issues and protect engine performance.

  • Should I choose a genuine or aftermarket coolant overflow tank?

    Both genuine and aftermarket coolant overflow tanks can be suitable options depending on your vehicle and operating conditions. A high-quality, durable replacement tank ensures reliable, optimal automotive cooling system performance when matched to the correct vehicle model and application.

  • Are coolant overflow tanks universal?

    Some universal coolant overflow tanks are available, but many vehicles require a model-specific design. Choosing the correct tank helps ensure proper fitment, reliable coolant recovery and consistent cooling system pressure for your auto.

  • How much does a coolant overflow tank cost?

    The price of a coolant overflow tank varies depending on the vehicle, design and application. Factors such as whether the part is genuine or aftermarket can also affect cost. Natrad can help customers find a suitable option for their vehicle and budget.

  • Can I order a coolant overflow tank online?

    Yes. Customers can browse available options, review product descriptions and make a purchase through our online shop. Delivery and shipping timeframes vary depending on stock availability and your location within Australia.

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