Heavy duty radiator caps
Natrad's heavy duty radiator caps offer superior protection against coolant loss and maintain correct pressure, enhancing the longevity of your vehicle's cooling system.
Reliable cooling control with radiator caps
A radiator cap isn’t just a lid — it’s a complex pressure valve that maintains safe pressure levels within your vehicle’s cooling system.
As the coolant draws heat out and away from the running engine, it expands and pressurises the entire cooling system. The cap’s internal pressure spring helps seal the cooling system until it reaches a certain pressure level. This relieves over-pressure as the expanding coolant is allowed back into the overflow tank (also called the expansion tank).
When the engine cools down again (bringing the coolant temperature down with it), the cap’s vacuum valve opens to allow the coolant fluid from the overflow tank to return to the radiator system without letting in any air.
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Protection for your cooling system
Natrad’s heavy duty radiator caps are engineered with precision to ensure correct pressure control, a critical factor in maintaining the integrity of your cooling system.
Natrad’s radiator caps feature robust construction, which provides lasting protection against coolant loss and helps maintain optimal system pressure. This reduces the risk of overheating and extends your engine’s lifespan, making Natrad the preferred choice for both industrial and automotive applications.
Natrad’s heavy duty radiator caps are sourced from quality accredited manufacturers.. This commitment to excellence ensures that every cap delivers reliable, long-lasting protection.
Industries we collaborate with
You’ll benefit from long service life with our heavy duty cooling products, ensuring accurate pressure control for heavy duty trucks and machinery.
Mining
Natrad’s heavy duty radiator caps are available to meet special safety needs and withstand the extreme conditions of mining operations, ensuring reliable cooling system performance in heavy machinery.
Road transport
Our radiator caps provide correct pressure control, enhancing the cooling efficiency of road transport vehicles, even under long-haul and high-stress conditions.
Agriculture
Natrad’s radiator caps help maintain optimal engine temperatures in agricultural equipment, ensuring reliable performance during prolonged field operations.
Earthmoving
Built for the rigours of earthmoving, our heavy duty radiator caps protect vital cooling systems in equipment that operates in demanding environments.
Rail
Natrad’s radiator caps are engineered to meet the robust demands of rail applications, providing durability and reliability for long-lasting performance.
Marine
Our heavy duty radiator caps ensure effective cooling in marine engines and offer protection against corrosion and pressure fluctuations in saltwater environments.
Power
Natrad’s radiator caps support the cooling needs of power generation equipment, delivering consistent performance and safeguarding against overheating in critical operations.
Find a convenient Natrad location
With Natrad's expansive national network, we deliver expert guidance, top-quality products, and reliable service, no matter where you are.
13 locations with an expert team ready to help
80+ experienced heavy duty technicians
50+ brands we are ready to service
Our heavy duty product range
Natrad's heavy duty cooling products are designed to enhance system efficiency, ensuring your equipment operates at peak performance. Explore our range today.
Intercoolers, Charge air coolers, Aftercoolers
Boost your engine's efficiency with our high-performance intercoolers, charge air coolers, and aftercoolers.
Oil coolers
Maintain optimal oil temperature and protect your engine with our reliable oil coolers.
Gaskets & seals
Ensure a leak-proof system with our durable gaskets and seals, designed for long-lasting performance.
Coolants
Protect your engine from extreme temperatures with our quality coolants, ensuring reliable performance.
Mechanically bonded radiator cores
Our mechanically bonded radiator cores are built for durability, offering superior heat dissipation.
ProCore radiator modules
Experience advanced cooling with our ProCore radiator modules, engineered for heavy duty applications.
Radiator caps
Safeguard your cooling system with our reliable radiator caps, designed to maintain proper pressure and prevent overheating.
Radiator cores
Enhance your cooling system with our robust radiator cores, crafted for maximum efficiency.
Radiator tanks & parts
Ensure your cooling system is in top shape with our durable radiator tanks and precision-engineered parts.
Choose Natrad as your cooling specialist
Largest range of products
Natrad had access to Adrad products which have Australia’s largest range of charge air coolers, intercoolers and aftercoolers.
Rigorous testing
All products go through rigorous testing to ensure only the best are selected for our range.
Convenient locations
You can find our heady duty cooling centres all over Australia.
Transparent pricing
The pricing for all our products is always transparent and accurate.
FAQs
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Why do radiators need to maintain pressure?
The pressure increases the coolant’s boiling point, making it able to provide cooling for the engine at higher temperatures. A good quality radiator and cooling system will allow your car’s engine to maximise its full potential.
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Can a bad radiator cap make your car overheat?
Yes. A faulty radiator cap can fail to hold pressure. If this happens, your engine will overheat if its temperature exceeds around 135°C as the coolant will boil. Bubbles and air pockets diminish the effectiveness of the cooling system and can deprive some components of cooling altogether.
The resulting excess heat building up in your engine block or in certain components can cause irreparable, expensive damage.
A faulty radiator cap can even contribute to your radiator exploding.
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Can you start a car with the radiator cap off?
Yes, you can start a car with the radiator cap off. In fact, turning the engine on with the cap off can help remove air bubbles, which is part of the process when topping up your radiator coolant level.
However, we strongly recommend only removing your radiator cap while the engine is cool since hot, pressurised coolant can sputter and burn you.
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Can I open a radiator cap when a car is running?
It is possible to open a radiator cap while the car’s engine is running, but it can be dangerous. Do not open the radiator cap if the engine has been running for a while or if the radiator feels hot. The hot, pressurised fluid could erupt and scald you.
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