Need a replacement coolant cap? Ask a radiator technician for the right radiator cap for your car.
The radiator cap is an important part that maintains the correct cooling system pressure. An old radiator cap may not hold the same pressure as a brand new one. So when your vehicle’s thermostat is replaced, it’s a good time to get a new radiator cap installed too.
If coolant pressure is too low, the coolant may boil at unacceptable temperatures. If the pressure is too high, the system can be damaged, and the vehicle may overheat. Replacing the radiator cap every few years will prevent malfunction.
Our qualified technicians can advise on replacement coolant caps
The largest network of radiator workshops Australia-wide
Access to an extensive range of aftermarket radiator and cooling parts
National warranty support for selected cooling products purchased
CU17120
Suitable for: Bottle Type Recovery Radiator Cap. Suits Holden Barina TK, Viva JF and Captiva, we well as Daewoo Kalos, Lacetti, Matiz, Nubira, and more.
PC17120
Suitable for: Holden Astra and Vectra.
RC4111
Suitable for: Standard Size, Recover Radiator Cap - 16psi / 110 kpa.
RCBP20JAPPR
Suitable for: Small Radiator Cap with Brass Pin and Lever - 20psi / 138kpa.
RCT16PRH
Suitable for: Radiator Cap with Brass Pin and Lever, the handle makes the cap suitable for mining and truck applications.
Your car's cooling system is kept under pressure to increase the boiling point of the coolant. This allows the system to effectively cool the engine without the coolant evaporating.
Whenever you top up or replace the coolant, check the radiator cap to make sure it's still in good condition. A correctly functioning radiator cap will vent pressure at a specific threshold, allowing excess coolant to spill into the coolant reservoir bottle. When the pressure decreases and the temperature drops, coolant is returned to the system.
A faulty coolant cap may result in vehicle overheating, collapsed hoses or leaking around the radiator cap. You can easily replace the radiator cap yourself when the car is cold. The new cap should have the same operating temperature and system pressure as the original coolant cap. To choose the right coolant cap, check your car manual or ask a Natrad radiator specialist.
Natrad’s National Warranty applies to radiator caps purchased at any Natrad store.
Find Out More
Get more value when you nip into Natrad. We’re offering a Free Cooling System Check as thanks for choosing us. T&Cs apply.
Got any questions about our heating and cooling services?
Ask us, and we'll get back to you soon.
