Parts for your 2010 Nissan Pathfinder-Tx valve

2010 Nissan Pathfinder TX Valve (Thermostatic Expansion Valve)

Based on technical references, a TX valve is indeed used on the 2010 Nissan Pathfinder (R51). The Nissan Factory Service Manual (FSM) for the 2010 Pathfinder, HA—Heater & Air Conditioning, details the “Expansion Valve” component and associated service procedures. Likewise, the Nissan Electronic Parts Catalogue (FAST) lists a “Valve Assy—Thermo Control” for the front system and, on models with rear air, a separate rear expansion valve. So for this model, the TX valve is relevant and fitted.

For the 2010 Pathfinder, the TX valve meters the flow of liquid R‑134a into the evaporator based on outlet temperature and pressure, helping the system deliver steady, cold air without icing the core. It’s the brains of the cooling side, matching refrigerant flow to heat load as Aussie or Kiwi temps swing and as cabin demand changes. On seven-seater models with rear A/C, there’s another TX valve at the rear evaporator to keep the back rows comfy as well.

It’s not a regular service item, but when diagnosing weak cooling, erratic vent temps or a frosty suction line, the TX valve should be on the shortlist. Common clues of a crook valve include:

• Low side pressure too low with poor cooling (overly restricted valve)
• Hunting or rapid cycling and vent temps that swing hot–cold
• Frost on the evaporator inlet or unusual hissing at the dash

If replacement is needed, it’s a job for an ARCtick‑licensed technician in AU/NZ because refrigerant recovery, evacuation and accurate recharging by weight are required. Best practice on a Pathfinder includes:

• Recovering refrigerant, then removing the valve at the evaporator (front, and rear if equipped)
• Fitting new HNBR O‑rings lightly lubricated with the specified oil (PAG/ND‑OIL as per the FSM)
• Replacing the receiver/drier or desiccant bag (often integrated with the condenser) to keep moisture out
• Pulling a deep vacuum and recharging to the factory charge by weight, avoid “by feel” regassing
• Verifying operation with pressure readings, vent temps and that the evaporator doesn’t ice up

Owners can help the TX valve live a long life by keeping the cabin microfilter fresh, running the A/C regularly year‑round to circulate oil, and addressing any compressor or contamination events promptly. For Pathfinders with rear air, remember there’s a second valve—skipping it can leave the back rows underperforming even if the front seems fine.

Popular questions

Does the 2010 Pathfinder use a TX valve or an orifice tube?
This model uses a thermostatic expansion valve. The FSM for the R51 shows the expansion valve in the A/C circuit, and the parts catalogue lists the valve assembly for front (and rear where fitted). Nissan didn’t use a fixed orifice tube on this platform.

Where is the TX valve located on a 2010 Pathfinder?
The front TX valve is mounted at the evaporator inlet in the HVAC case behind the dash. On models with rear A/C, a second valve sits near the rear evaporator, typically behind trim in the right‑rear quarter area. Access requires interior trim and component removal, so it’s not a quick driveway swap.

Should the TX valve be replaced when changing the compressor?
It’s strongly recommended if the old compressor failed or shed debris. Along with the receiver/drier/desiccant, replacing the TX valve helps protect the fresh compressor from contamination and restores proper control of refrigerant flow.