Need a replacement coolant cap? Ask a radiator technician for the right radiator cap for your car.
The coolant cap, often referred to as a cooling system pressure 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 radiator cap replacement installed too.
If coolant pressure is too low, the engine coolant may boil at unacceptable temperatures. If the pressure is too high, the system can be damaged, and the vehicle may overheat. Replacing your coolant cap every few years will prevent malfunction and protect your engine’s cooling system.
Our qualified technicians can advise on replacement coolant caps
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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 relies on a cooling system pressure cap to keep everything operating at the right temperature. By increasing the boiling point of the engine coolant, this cap helps prevent the coolant from evaporating under high heat—ensuring your engine stays at the correct temperature even during demanding conditions. A healthy coolant cap regulates pressure by venting excess coolant into the coolant overflow reservoir and drawing it back in as the engine cools. This pressure regulation is key to maintaining system balance and avoiding issues like overheating or leaks.
Every time you top up or change your coolant, take a moment to inspect the radiator cap or coolant reservoir cap. If your car coolant cap is cracked, loose, or worn out, it's time for a car coolant cap replacement. It’s a simple swap—just make sure the new cap matches your vehicle’s size, pressure and temperature specs. Not sure what you need? Natrad can help you find the exact engine coolant cap, coolant reservoir cap, or coolant overflow cap your vehicle requires.
Get more value when you nip into Natrad. We’re offering a Free Cooling System Check as thanks for choosing us. T&Cs apply.
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