Parts for your 2017 Nissan Navara-Radiator cap

2017 Nissan Navara Radiator Cap — What it does and how to look after it

Yes, the 2017 Nissan Navara (D23/NP300) uses a radiator cap. Technical sources back this up: the Nissan Navara D23 Series Service Manual (CO – Cooling System) specifies a pressure-type radiator cap and its test/relief range, while the 2017 Navara Owner’s Manual warns not to open the radiator cap when hot. Australian and New Zealand parts catalogues from brands like Tridon and Gates also list a dedicated cap for the D23 (2015‑on), typically around 0.9 bar (about 90 kPa). That makes the radiator cap relevant and serviceable on this vehicle.

On the 2017 Navara, the radiator cap is a small but critical bit of kit. It seals the cooling system and holds a set pressure so coolant can run hotter without boiling — handy when towing, climbing long hills, or dealing with Aussie and Kiwi summer heat. It also works as a two-way valve: when the coolant expands, excess is pushed into the overflow bottle, as things cool, the cap’s vacuum valve draws fluid back, keeping air out and the system full.

When a cap gets tired — weak spring, cracked rubber seal, sticky valve — it can cause sneaky problems: slow coolant loss, hot-running at highway speeds, collapsed hoses after shutdown, aerated coolant, or a stain of dried coolant around the filler neck. That’s why it deserves a look every service. A quick visual check of the rubber seals, a clean of the filler neck, and confirming the rating matches spec go a long way. If there’s any doubt, a pressure-cap tester can confirm whether it holds and releases at the proper pressure.

As part of routine servicing, it’s smart to:

• Inspect the cap at each service interval, replace at the first sign of perished seals, corrosion, or inconsistent pressure-hold.
• Use the correct rating (commonly around 0.9 bar for D23), mismatched caps can cause overheating or hose damage.
• Only open when the engine is stone cold. If a top-up is needed, use the correct coolant mix and ensure the cap is tightened to the final click.

Many owners opt to proactively replace the cap every 3–5 years, especially if towing or driving in hot conditions. It’s inexpensive insurance for the water pump, heater core, and hoses — and helps the Navara stay cool under load.

Popular questions about the 2017 Nissan Navara radiator cap

What pressure radiator cap does a 2017 Nissan Navara use?
Most D23 Navaras take a cap rated around 0.9 bar (roughly 88–108 kPa). The exact rating is printed on the cap itself and specified in the D23 Service Manual. If unsure, match the rating on the original cap or check a reputable AU/NZ parts catalogue.

Can the Navara be driven without a radiator cap?
No. Without a correct, sealing cap the system can’t hold pressure, the coolant can boil early, and you’ll likely lose coolant into the overflow or as steam. If the cap is damaged or missing, replace it before driving any distance.

Where is the radiator cap on a 2017 Navara?
It’s typically on the top of the radiator under the bonnet, with an overflow/expansion bottle nearby. Only open it when the engine is completely cold to avoid scalding and to prevent pulling air into the system.