Parts for your 2014 Nissan Navara-Tx valve

2014 Nissan Navara TX Valve (Thermal Expansion Valve)

Based on technical references including the Nissan Navara D40 Service Manual (HVAC/HA section), the Nissan FAST electronic parts catalogue listing the A/C Expansion Valve (e.g., 92200‑EB30A/EB31A) for D40 models through 2014, and DENSO/Sanden system guides for Nissan light trucks of this era, the 2014 Navara uses a thermostatic expansion valve (TX valve) at the evaporator—not an orifice tube. So yes, a TX valve is fitted and relevant to the 2014 Nissan Navara’s air‑conditioning system.

The TX valve’s job is pretty simple but crucial: it meters liquid refrigerant into the evaporator based on temperature and pressure (superheat), keeping the evaporator cold without flooding the compressor with liquid. For the Navara, that means steady cabin temps on a scorching arvo, decent cool-down even after a hot soak, and better compressor protection for long-haul reliability.

It’s not a regular “service item”, but it does deserve attention when the A/C is opened up or performance drops. On a 2014 Navara (D40), a crook TX valve can show up as:

• Weak cooling at idle or wildly fluctuating vent temps
• Frosting at the evaporator/lines or a hissing/whistling expansion noise
• Odd gauge readings (very high or very low pressures) during diagnosis

Good practice when the system’s being repaired or refreshed:

• Have an ARCtick-licensed tech recover the refrigerant—don’t vent it. NZ techs should follow the relevant refrigerant handling rules too.
• If the TX valve is replaced, renew the O‑rings, add the correct PAG oil type/amount for any parts changed (Nissan/DENSO spec, often ND‑Oil 8/PAG 46), and replace the receiver‑drier or desiccant bag.
• Pressure‑test with dry nitrogen, evacuate thoroughly, then charge the exact R134a amount by weight as per the under‑bonnet label.
• Follow the service manual for access (typically via the evaporator case) and bolt torque specs—don’t overtighten.

A few preventative tips go a long way: keep the condenser fins clean, ensure the radiator/condenser fans are doing their job, and change the cabin filter so the evaporator sees solid airflow. If the compressor’s failed or there’s heavy contamination, expect to flush lines and strongly consider a new TX valve while you’re in there—it’s cheap insurance against repeat dramas.

Popular questions about the 2014 Nissan Navara TX valve

Does the 2014 Navara use a TX valve or an orifice tube?
It uses a thermostatic expansion valve mounted at the evaporator. That’s the factory setup on D40 models of this year, as shown in the Nissan HVAC service documentation and parts catalogue.

When should the TX valve be replaced?
Only when it’s faulty or during major A/C work—like after a compressor failure, evaporator replacement, or if contamination is suspected. Always pair it with new O‑rings and a fresh receiver‑drier/desiccant bag.

What refrigerant and oil should be used?
2014 Navara D40 systems run R134a. Oil is the Nissan/DENSO‑specified PAG (commonly ND‑Oil 8/PAG 46), but the tech should confirm on the under‑bonnet label and the workshop manual to get the exact spec and charge quantity right.