Parts for your 2013 Nissan Navara-Radiator cap

2013 Nissan Navara radiator cap — what it does and how to look after it

Based on the Nissan D40 Series workshop manual (CO — Cooling System), plus well-known application guides from Tridon and Gates, the 2013 Nissan Navara (D40) uses a conventional pressure-type radiator cap fitted on the radiator’s top tank. It’s a relevant, serviceable part of the cooling system on diesel and petrol variants.

The radiator cap on a 2013 Navara does far more than just close the filler neck. It’s a pressure valve that raises the coolant’s boiling point so the engine can run at the right temperature without boiling over, and a vacuum valve that draws coolant back from the overflow bottle as the engine cools. When it’s working properly, it keeps pressure stable, prevents air from sneaking in, and helps the coolant circulate as designed.

Because the cap is a small part doing a big job, keeping it tidy is worth it. A tired spring, nicked rubber seal, or a cap that no longer holds the specified pressure can cause gradual coolant loss, overheating on climbs or tows, collapsed hoses after cool-down, or crusty stains around the filler neck. Any of those are a nudge to test or replace the cap.

• Match the pressure rating to the vehicle spec (the D40 commonly uses around 0.9 bar). Check the handbook or under-bonnet labels.
• Only remove the cap when the engine is completely cold. Use a rag and release it slowly to the first detent.
• Inspect at every service: look for hardened or cracked seals, corroded necks, or sticky valves.
• Pressure-test the cap with a cooling-system tester if there are unexplained coolant losses.
• Replace every 3–5 years, or sooner if it fails a test. Use a quality cap that meets the OE pressure range.

Location-wise, the Navara’s cap sits on the radiator top tank, with an overflow hose leading to the reservoir. If the cap or neck shows deposits, also check coolant condition and the radiator neck for pitting before refitting a new cap. A good seal, the correct pressure rating, and clean mating surfaces go a long way to keeping a D40 happy on long hauls and gravel backroads.

Popular questions about 2013 Nissan Navara radiator caps

What pressure radiator cap should a 2013 Navara use?
The D40 Navara typically runs a pressure cap around 0.9 bar (roughly 90 kPa). Always confirm against the owner’s manual or the under-bonnet label and match like-for-like. Using a cap that’s too high can stress hoses and the radiator, too low can lead to boil-over and aeration.

Where is the radiator cap on a 2013 Navara?
It’s on the radiator’s top tank in the engine bay, with a small hose to the overflow bottle. If an aftermarket radiator or different tank has been fitted, the position can shift slightly, but it will still be on the radiator filler neck, not the reservoir.

How often should the cap be replaced?
As a rule of thumb, every 3–5 years, or at the first sign of trouble. If there’s coolant staining, fluctuating temps, or hoses collapsing after shutdown, get the cap pressure-tested and replace if it’s out of spec.