Parts for your 2015 Nissan Pathfinder-Tx valve

2015 Nissan Pathfinder TX Valve (Thermostatic Expansion Valve)

Referencing the Nissan factory Electronic Service Manual (R52, HA – Heating & Air Conditioning) and major parts catalogues (Nissan Genuine/FAST, Denso, Four Seasons), the 2015 Nissan Pathfinder runs a thermostatic expansion valve (TX valve) on the front evaporator, and models with rear air-con have a second TX valve for the rear unit. So yes—this vehicle is fitted with a TX valve, not an orifice tube.

The TX valve’s job is to meter refrigerant into the evaporator based on temperature/pressure feedback, keeping the evaporator cold without letting it ice up. On the Pathfinder, that means steady cabin temps, quick pull-down on hot days, and fewer swings between warm and frosty vents. Where rear A/C is fitted, a separate rear TX valve does the same for passengers in the second and third rows.

It’s not a regular maintenance item, but a tired or sticking TX valve can make the air-con underperform. Typical signs include:

• Weak or intermittent cooling, especially at idle or in traffic
• Vent temps that cycle cold–warm–cold
• Frosting at the evaporator or on one line only
• Pressure readings that don’t stabilise (diagnosed on the gauges)

When replacement is needed on a 2015 Pathfinder, it’s best handled by a licensed air-con technician. The system uses R‑134a on this model year in AU/NZ markets, the circuit must be recovered, opened, and re-sealed with new HNBR O‑rings lightly lubricated with the correct PAG oil (ND‑Oil 8 equivalent). The receiver/drier or desiccant bag should be renewed whenever the system’s opened, then the system vacuum-tested, nitrogen leak-checked, and re-gassed to the specified charge.

Front TX valve access is at the evaporator inlet, rear TX valve (if fitted) is mounted at the rear A/C unit behind the right rear quarter trim. Because these Pathfinders can have two TX valves, sound diagnosis matters—don’t replace the front valve if the fault is actually at the rear unit. If the compressor, condenser, or a burst hose has shed debris, plan on flushing what’s serviceable and replacing any contaminated components to protect the new valve. Correct torque on fittings and a final performance check (vent temps and stable pressures) will have the Pathfinder’s air-con working sweet as for long summer kilometres.

Popular questions about 2015 Nissan Pathfinder TX valve

Does a 2015 Nissan Pathfinder use a TX valve or an orifice tube?
It uses a TX valve. The Nissan ESM (R52, HA section) and common parts catalogues list an expansion valve for the front evaporator, plus a second valve on models with rear air-con.

Where is the TX valve located on a 2015 Pathfinder?
The front TX valve sits at the evaporator inlet. Vehicles with rear A/C have another TX valve on the rear evaporator, tucked behind the right rear quarter trim in the cargo area.

Should the TX valve be replaced as routine maintenance?
No. It’s replaced only when faulty or when the system’s been contaminated or opened for major repairs. Always fit new O‑rings, renew the receiver/drier or desiccant bag, evacuate, leak-test, and re-gas to spec with R‑134a.