Parts for your 2010 Nissan Navara-Tx valve

2010 Nissan Navara TX Valve — purpose, service and replacement

The 2010 Nissan Navara (D40) is fitted with a thermostatic expansion valve (TX valve/TXV) as part of its factory air-conditioning system. This isn’t guesswork: the Nissan D40 Service Manual (Heating & Air Conditioning, HA/HAC sections for 2010) calls up an “Expansion Valve” at the evaporator, and the Nissan FAST parts catalogue lists a dedicated expansion valve for D40 variants. Major aftermarket catalogues from DENSO, Nissens and Four Seasons also specify a TXV for the 2010 Navara, confirming it’s the correct metering device for this model.

What does it do? The TX valve meters R134a into the evaporator based on the temperature and pressure it senses at the outlet, keeping the evaporator just cool enough to boil the refrigerant to vapour without freezing. That balance maintains steady cabin temps, protects the compressor from liquid slugging, and helps the air-con stay efficient across Aussie and Kiwi conditions—from city crawl to highway hauls.

When a TXV plays up, owners often notice weak cooling at idle, inconsistent vent temps or icing on the evaporator core. A stuck-closed valve starves the evaporator, a stuck-open valve floods it. Common signs include:

• Poor cooling at low speed, better at higher revs
• Frost or sweating on the evap case, musty smell after thawing
• Hunting or surging vent temperatures
• High/low side pressures out of spec on manifold gauges
• Audible hissing/whistling near the glovebox area

The TX valve isn’t a routine “service item”, but it should be assessed any time the system’s opened or performance drops. Smart preventative steps include keeping the cabin filter clean, washing condenser fins, and ensuring the exact refrigerant charge is recovered, evacuated and weighed back in to the under‑bonnet spec. If the system’s been contaminated (black death, moisture ingress), replace the receiver‑drier, flush lines where applicable and consider the TXV to avoid repeat issues.

Replacement sits behind the glovebox at the evaporator block. It’s a licenced technician’s job under AU/NZ regulations: recover refrigerant, remove the lower dash trim/glovebox, unbolt the lines, renew O‑rings, fit the new TXV, insulate it properly, pressure‑test with nitrogen, evacuate deeply and recharge with the specified mass of R134a. Torque the fittings to spec from the service manual to avoid leaks. Done right, the Navara’s air‑con snaps back to crisp, reliable cooling for the long kilometres ahead.

• Where is the TX valve on a 2010 Nissan Navara?
  It’s mounted on the evaporator assembly behind the glovebox, where the two aluminium refrigerant lines enter the HVAC case. Access typically involves removing the glovebox and lower trim.
• Does the 2010 Navara use an orifice tube instead?
  No. The D40 platform uses a thermostatic expansion valve rather than a fixed orifice tube, which lets it modulate refrigerant flow and maintain proper superheat across varying conditions.
• Should the TX valve be changed with a new compressor?
  If there’s evidence of contamination or a compressor failure, it’s wise to replace the TXV and receiver‑drier, flush where appropriate, and recharge to spec. Many compressor warranties require these steps.