Parts for your 2017 Nissan Navara-Tx valve

2017 Nissan Navara TX Valve – Fitment, Purpose and Service Advice

Technical references confirm the 2017 Nissan Navara (D23/NP300) uses a thermostatic expansion valve (TXV). The Nissan Navara D23 Electronic Service Manual (HA: Heater & Air Conditioning) identifies and diagrams an “Expansion Valve” at the evaporator. Nissan’s FAST electronic parts catalogue, along with reputable aftermarket catalogues from Denso, Nissens and Four Seasons, all list a dedicated A/C expansion (TX) valve for 2015–2019 Navara models. So yes, a TX valve is fitted and is relevant to the 2017 Navara’s air-con system.

On the 2017 Navara, the TX valve meters how much refrigerant enters the evaporator, keeping just the right superheat so the system cools strongly without flooding liquid refrigerant back to the compressor. In day-to-day terms, it’s the little metering brain that helps deliver crisp, steady cabin temps in Aussie and Kiwi summers, whether the ute’s idling at the job site or cruising the motorway.

There’s no scheduled replacement for a TX valve, it’s a sealed part that can last the life of the vehicle. That said, it can stick, clog or go out of calibration after compressor failure, moisture ingress or contamination. Typical clues include weak cooling at idle, frost on the evaporator pipes, a vent temperature that swings hot-to-cold, or pressure readings that show a starved evaporator (low low-side, high superheat). If the A/C’s been open or a compressor has let go, a new TX valve is cheap insurance.

Replacement on the D23 typically involves accessing the valve at the evaporator block near the firewall connections. A licensed tech will recover the refrigerant, disconnect the lines, replace the TX valve and O‑rings (lightly lubricated with the correct PAG oil), then vacuum, leak-test and recharge. Always fit a new receiver-drier or desiccant bag whenever the system’s been opened. For AU/NZ vehicles of this vintage, the system generally uses R134a—charge strictly by weight as per the under‑bonnet label. After charging, a proper performance test (ambient, centre vent temps, and manifold pressures) confirms the job’s spot on.

• Best practice on TX valve jobs:
  • Recover, replace O-rings and receiver-drier, evacuate 30–45 minutes.
  • Recharge by weight to the placard spec, don’t “top up by feel”.
  • Check cabin filter and clean the condenser for peak performance.

Does the 2017 Navara use a TX valve or an orifice tube?

It uses a thermostatic expansion valve (TXV) mounted at the evaporator, not an orifice tube. This is documented in the D23 A/C system service information and supported by OEM/aftermarket parts listings.

Where is the TX valve on a 2017 Navara and how long does it take to replace?

It’s fitted at the evaporator block near the firewall line connections. Access varies by trim, many are serviceable from the engine bay, though some require glovebox/evaporator housing access. Allow roughly 1.5–3.0 hours, longer if the evaporator needs to come out.

What are common signs the Navara’s TX valve is failing?

Weak cooling at idle, temperature swings, frosting on the low-side line, hissing at the firewall, or pressure readings showing a starved or flooded evaporator. After compressor failure or contamination, replacing the TX valve and receiver-drier is strongly recommended.