Parts for your 2016 Nissan Navara-Tx valve

2016 Nissan Navara TX-valve: what it does and when to replace it

On the 2016 Nissan Navara (D23/NP300), a thermostatic expansion valve (TX-valve) is fitted to the air-conditioning system. This is confirmed in the Nissan Navara D23 Series Workshop Manual (HA – Heating & Air Conditioning section), which describes an expansion valve mounted at the evaporator inlet managing refrigerant flow by sensing evaporator temperature and pressure. The Nissan Electronic Parts Catalogue for D23 models likewise lists an A/C expansion valve for 2015–2018 Navara variants, and professional data services (e.g., Autodata/HaynesPro A/C system overviews) specify a TXV-type system rather than an orifice-tube layout. So yes—TX-valve is relevant and used on the 2016 Navara.

The TX-valve is the bit that meters how much liquid refrigerant enters the evaporator. By reacting to evaporator outlet temperature and pressure, it keeps the evaporator just shy of freezing, delivering cold, dry air through the vents without icing up. In real-world terms, it helps the Navara’s air con stay stable across hot Aussie and Kiwi summers, whether idling at the lights or towing up a grade.

It’s not a routine “service item” like a cabin filter. The valve generally gets replaced only if it’s faulty, contaminated, or the system’s been open for major work. Signs of a crook TX-valve include weak or fluctuating cooling, a frosty or sweating evaporator case, uneven vent temps side-to-side, or pressure readings that are oddly high or low for the conditions.

If replacement is needed, a workshop will recover the refrigerant, remove the dash-side evaporator pipework to access the valve, renew the O-rings, and then evacuate and recharge the system with the specified refrigerant (typically R134a on AU/NZ 2016 Navara models—check the under‑bonnet label). It’s good practice to replace the receiver–drier or desiccant bag (often integrated with the condenser on the D23) any time the system’s opened. After reassembly, a vacuum hold test and an accurate recharge by weight are essential to avoid under- or over-charge dramas.

• Helpful habits: run the A/C for 10–15 minutes monthly to move oil through the TX-valve, keep the cabin filter clean to maintain airflow, and address any contamination after compressor failures (flush, new drier, and TXV as required).
• When to book in: poor cooling on hot days, ice-up, or noisy/short-cycling operation. A qualified A/C tech can confirm TX-valve performance with gauge readings and temperature drop checks.

Done right, a fresh TX-valve restores predictable cooling, better demist performance, and keeps the Navara comfortable across long kilometres.

Popular questions about the 2016 Nissan Navara TX-valve

Where is the TX-valve located on a 2016 Navara?
It’s mounted at the evaporator inlet inside the HVAC case, typically accessed from the passenger side under the dash where the A/C lines pass through the firewall. Access usually requires removing trim and disconnecting the evaporator pipes.

What are the common symptoms of a failing TX-valve?
Expect weak or inconsistent cooling, vent temperatures that swing hot–cold, frosting at the evaporator case, and abnormal high/low side pressures. After a compressor failure, debris can jam the valve and mimic these symptoms.

Should the TX-valve be serviced regularly?
No routine replacement is specified. It’s serviced or replaced when there’s a confirmed fault, contamination, or major A/C repair. Always pair TX-valve work with new O-rings, a renewed drier/desiccant, and a precise recharge.