Parts for your 2005 Nissan Pulsar-Radiator cap

Radiator cap for 2005 Nissan Pulsar (N16)

Based on technical sources, the 2005 Nissan Pulsar (N16) does use a radiator cap. The Nissan Pulsar/Almera N16 Factory Service Manual (Cooling System section) includes a radiator cap inspection and pressure test procedure, specifying relief pressure around 0.9 bar, confirming a pressure cap is fitted on the radiator neck. Australian catalogues such as the Tridon Radiator Caps Application Guide and Gates cooling system cap listings also specify a 0.9 bar bayonet-style cap for the N16 Pulsar across 2000–2005 models.

On this model, the radiator cap is a key pressure-control device. It seals the cooling system and holds a set pressure (typically 0.9 bar/90 kPa), which raises the boiling point of the coolant to help the Pulsar run cool on hot Aussie and Kiwi days or under load. It also has a vacuum valve that allows coolant to return from the overflow bottle as the engine cools, keeping the system topped up and free of air pockets.

When the cap weakens, the Pulsar can develop hard-to-trace issues like creeping temperature under load, coolant loss into the overflow, or hoses collapsing after shutdown. Regular checks and timely replacement make a big difference to cooling-system reliability.

• Match the cap’s pressure rating: 0.9 bar (about 13 psi) is commonly specified for the N16. Always confirm the rating stamped on the original cap or in the service data.
• Inspect annually: look for cracked rubber seals, a sticky spring, or corroded seat.
• Replace every 3–5 years, or sooner if testing shows it won’t hold pressure.
• Only remove the cap when the engine is completely cold. Use a cloth and open it slowly.
• Check the radiator filler neck is clean and the overflow hose is clear and properly connected to the reservoir.

During servicing, a quick pressure test of the cap and visual inspection of the seal and neck can prevent overheating headaches. Fit a quality cap that meets or exceeds OE spec, and make sure it’s the radiator cap itself—on the N16 Pulsar the pressure cap is on the radiator, not the plastic overflow bottle. Done right, the cooling system will stay stable, the heater will perform properly, and the Pulsar will be happier on long runs and city commutes alike.

What pressure radiator cap does a 2005 Pulsar need?

Most 2005 Nissan Pulsar (N16) variants specify a 0.9 bar (90 kPa, ~13 psi) radiator cap. Check the stamping on your current cap or the vehicle’s service information to confirm, as some markets and engines can vary slightly. Using the correct pressure rating is essential for proper coolant boiling-point control.

How often should the radiator cap be replaced?

Have it inspected at least annually and pressure-tested during cooling-system service. As a rule of thumb, replace the cap every 3–5 years, or immediately if it fails a pressure test, shows damaged seals, or causes overflow/overheating symptoms.

Where is the radiator cap on a 2005 Pulsar?

It’s mounted on the radiator neck at the top tank, near the upper radiator hose. The pressurised cap is on the radiator itself, not on the translucent overflow reservoir. Always make sure the engine is stone-cold before removing it.