Parts for your 2016 Nissan Pathfinder-Tx valve

2016 Nissan Pathfinder TX-valve (Thermostatic Expansion Valve)

Technical references including the Nissan Pathfinder (R52) 2016 Service Manual – HA (Heating & Air Conditioning) section and OEM parts catalogues list an A/C expansion valve fitted to this model, with front and (where equipped) rear TX-valves. Aftermarket catalogues from major suppliers also specify a block-type expansion valve for the front evaporator and a separate rear unit on dual-zone/rear A/C cars. So yes—this Pathfinder uses a TX-valve.

The TX-valve is the little metering brain of the Pathfinder’s air-con. It regulates how much liquid refrigerant enters the evaporator, reacting to temperature and pressure so the system cools hard without icing up. When it’s working right, everyone’s comfy—no matter if it’s a scorcher outside or the family’s just jumped in after footy training. On models with rear air, there’s a second TX-valve at the rear evaporator doing the same job for the back rows.

Unlike filters and belts, the TX-valve isn’t a scheduled replacement item. It’s typically replaced if it sticks, clogs with debris/moisture, or after a major A/C failure or contamination event. Tell‑tale signs can include weak cooling at idle, evaporator icing, rapid cycling, high or unbalanced gauge readings, or the rear zone behaving differently to the front (on vehicles with rear air). A proper diagnosis with manifold gauges, temperature probes and a recovery machine is the go—to avoid parts‑darting.

When replacement is needed, it’s a precision, sealed‑system job. A licensed technician should recover the refrigerant, replace the TX-valve and all associated O‑rings, and fit a new receiver/drier or desiccant bag when the system’s been opened. It’s smart practice to flush lines (where appropriate), verify the condenser and orifices are clear, and then evacuate the system under deep vacuum before recharging by weight with the exact refrigerant shown on the under‑bonnet label. Oil balance matters too—use the correct PAG oil type and quantity specified by Nissan.

As part of routine servicing, the best “maintenance” for a TX-valve is preventative care of the whole A/C system: keep condenser fins clean and straight, ensure the cabin filter is fresh so airflow over the evaporator is spot on, and run the A/C regularly year‑round to circulate oil and keep seals happy. If your Pathfinder has rear air, remember a fault at either TX-valve can affect overall cooling—so inspections should consider both ends.

• Typical checks: sight for oily residue at fittings, listen for blend‑door quirks, scan for HVAC faults, and confirm vent temps and pressure readings.
• Always replace disturbed O‑rings, torque fittings correctly, and leak‑test with nitrogen or an approved method before the final recharge.

Popular questions about the 2016 Nissan Pathfinder TX-valve

Does my 2016 Pathfinder have more than one TX-valve?

If the vehicle is fitted with rear air conditioning, it typically has two TX-valves—one up front at the main evaporator and a second at the rear unit. If there’s no rear A/C, there’s usually just the single front valve.

When should the TX-valve be replaced?

There’s no fixed kilometre interval. Replace it if diagnostics show it’s sticking or restricted, after compressor failure or contamination, or any time the system has been opened and debris or moisture are suspected. Pairing this with a new receiver/drier or desiccant is good practice.

Can a clogged cabin filter affect TX-valve performance?

Indirectly, yes. Poor airflow over the evaporator can alter pressures and temperatures, making the system behave poorly and complicating diagnosis. A fresh cabin filter helps the TX-valve do its job properly and keeps cabin comfort consistent.