Parts for your 2014 Nissan Navara-Thermostat

2014 Nissan Navara Thermostat — purpose, servicing and replacement

Yes, a thermostat is absolutely fitted to the 2014 Nissan Navara. Technical references including the Nissan Factory Service Manual for D40 models (Cooling System section) and Nissan’s parts catalogue list a dedicated thermostat assembly for the common engines of this year. The YD25DDTi 2.5‑litre diesel typically uses a thermostat that begins to open around 76.5–79.5°C, while the V9X 3.0‑litre V6 diesel units use a higher‑rated thermostat near 82°C. That confirms the part is relevant and integral to the Navara’s cooling system.

The thermostat’s job is to help the engine warm up quickly, then hold it in its happy zone for power, economy, and long life. When cold, it stays shut so coolant circulates within the engine, speeding warm‑up. As temperature rises, it opens to let coolant flow to the radiator, keeping things steady during towing, long highway runs, or stop‑start city work.

For servicing, it’s smart to treat the thermostat as a wear item. While many last a long time, age, stop‑start duty, hard towing, and neglected coolant can make them stick open (slow warm‑up, high fuel use, weak heater, possible P0128 code) or stick closed (overheating, hard hoses, coolant pushed to the overflow). Navara owners often pair thermostat replacement with a coolant change to keep the system clean and corrosion‑free.

• When to replace: commonly at major cooling‑system services, or if there are symptoms like temperature swings, overheating, slow warm‑up, or repeated low‑temp codes.
• Parts to use: quality OEM or OE‑equivalent thermostat with the correct temperature rating, plus a new gasket/O‑ring.
• Good workshop practice:
  • Drain coolant safely and capture it for recycling.
  • Clean mating surfaces, avoid sealant unless specified.
  • Refit housing bolts evenly and tighten to the service‑manual spec.
  • Refill with the correct Nissan‑approved long‑life coolant mix (deionised water if mixing).
  • Bleed air thoroughly with the heater on hot, check for leaks and stable temp under load.

Located in the outlet housing by the lower radiator hose connection on the front of the engine, the thermostat is straightforward for a competent technician. Keeping it healthy helps protect the head, turbo, and EGR components, and keeps the Navara running sweet as on long Kiwi and Aussie drives.

Popular questions about the 2014 Nissan Navara thermostat

Where is the thermostat located on a 2014 Navara?
The thermostat sits in the coolant outlet housing where the lower radiator hose meets the engine. On the YD25 diesel it’s at the front of the block, the V6 diesel locates it in the front cover area. Access is from under the bonnet with basic hand tools.

What temperature should it open at?
For most 2014 Navara YD25 diesels, the thermostat starts to open around 76.5–79.5°C. The V9X V6 diesel generally uses an ~82°C unit. A scan tool showing coolant temperature or a hot‑and‑cold hose check can help verify it’s doing its job.

Does the ECU need resetting after replacement?
No ECU reset is normally required. After fitting, bleed the cooling system properly, confirm stable operating temperature on a test drive, and clear any stored fault codes (like P0128) if present.