Parts for your 2014 Nissan Pulsar-Radiator cap

2014 Nissan Pulsar radiator cap — purpose, fitment, and service tips

For the 2014 Nissan Pulsar (C12 hatch and B17 sedan), a radiator cap is absolutely relevant and fitted. Nissan’s factory service information for these models specifies a pressure-type radiator cap on the radiator neck, along with inspection and pressure-testing during routine maintenance. The Owner’s Manual warnings about never opening the cap when hot reinforce that the cooling system uses a conventional pressure cap. These details appear in the Cooling System (CO) and Maintenance (MA) sections of the model’s service manual and in the owner literature commonly supplied with the vehicle.

The radiator cap on a 2014 Pulsar does more than simply close the filler neck. It’s a calibrated pressure valve that raises the coolant’s boiling point, helping the engine run at the right temperature even on scorching Aussie or Kiwi summer days. It also has a vacuum valve that lets coolant return from the overflow bottle into the radiator as the engine cools, preventing air pockets. A healthy cap protects hoses and the heater core by controlling pressure, reduces coolant loss, and keeps the system sealed so corrosion inhibitors in the coolant can do their job. If the cap can’t hold the specified pressure (often around 0.9–1.1 bar for many Nissans, check the marking and service data for the exact figure), the Pulsar can overheat at idle, push coolant into the bottle, or develop weak cabin heat.

As part of regular servicing, the cap should be inspected and, if needed, pressure-tested against the rated spec listed on the cap and in Nissan service data. Only remove it when the engine is stone cold. Look for perished rubber seals, a sticky centre valve, cracked or corroded seating surfaces, and mineral crust around the filler neck. When replacing, use an OE or OE-quality cap with the correct pressure rating and neck style for the Pulsar’s radiator. After coolant changes, bleed the system properly, top up via the radiator neck, fit the cap, then set the overflow bottle to the MAX mark. Practical clues a cap may be on the way out include:

• Collapsed upper hose after cool-down
• Unexplained coolant loss or frequent top-ups
• Overheating at low speeds but fine on the open road
• Crusty deposits around the cap or filler neck

During scheduled coolant replacement (per Nissan’s service schedule), cap replacement is inexpensive insurance to keep the Pulsar’s cooling system reliable for the long haul.

Popular questions about the 2014 Nissan Pulsar radiator cap

What pressure rating does the 2014 Pulsar radiator cap use?
Most Pulsar variants of this year run a cap in the 0.9–1.1 bar range, but the definitive answer is printed on the cap itself and listed in Nissan’s cooling system service data. Always match the exact rating when replacing.

How often should the radiator cap be replaced?
Have it inspected at every service and pressure-tested when doing coolant work. Replace it if the rubber is perished, the valve sticks, the test shows it can’t hold the specified pressure, or as a preventative when changing coolant.

Is the cap on the radiator or on a pressurised tank?
On the 2014 Pulsar C12/B17, the pressure cap sits on the radiator neck. The translucent overflow bottle beside it is not pressurised, it handles expansion and return as the engine heats and cools.