Parts for your 2009 Nissan Dualis-Tx valve

2009 Nissan Dualis TX valve: what it does and when to replace it

Based on technical sources, the 2009 Nissan Dualis (J10, also known as Qashqai) uses a thermostatic expansion valve (TX valve). The Nissan Dualis/Qashqai J10 Electronic Service Manual (ESM), section HA – Heater & Air Conditioner, illustrates the evaporator and a TXV mounted at the evaporator inlet. Nissan’s FAST parts catalogue lists a “Valve Assy – Expansion” for J10 models (commonly catalogued under the 27665-***** series), and DENSO’s HVAC application data for Qashqai/Dualis 2007–2013 specifies a TXV-style metering device. So yes—TX valve is relevant and fitted on the 2009 Dualis.

On the 2009 Dualis, the TX valve is the metering brain of the air‑con. It doses liquid R134a into the evaporator, responding to temperature and pressure to hold the right superheat. That balance keeps the evaporator cold without flooding the compressor with liquid, which protects the system and keeps cabin temps steady through stop‑start city traffic and long highway runs.

When a TX valve plays up, the cabin comfort goes out the window. Common give‑aways include:

• Warm air at idle that improves only when driving.
• Evaporator or suction line icing, or no icing at all in hot weather.
• High or unstable high‑side pressure with starved low‑side readings.
• Hunting cabin temps and a loud hiss at the dash.
• Poor demist performance on damp mornings.

Replacement on a J10 is straightforward for a trained tech, but it’s not a quick DIY. The valve sits at the evaporator, so the lines are disconnected at the firewall in the engine bay and access is typically through the passenger side by removing the glovebox/evaporator cover. Refrigerant must be recovered, not vented. Expect new O‑rings, a light oil balance as specified by the ESM, and re‑torqued fittings to the factory spec. Because the Dualis uses a receiver/drier integrated with the condenser on many variants, factor in drier replacement if the system has been open to air or contaminated.

Good servicing practice makes a world of difference:

• Always evacuate and recharge by weight to the label under the bonnet.
• Replace the cabin filter to keep airflow across the evaporator healthy.
• Rinse the condenser fins, airflow is king for pressure control.
• Use new, correct‑size O‑rings lubricated with the right PAG oil.
• Pressure‑test with nitrogen before vacuum to catch slow leaks.

Treat the TX valve as a lifetime part, but don’t hesitate to replace it if diagnostics point that way—especially after compressor failure, moisture ingress, or black death contamination. Run the air‑con regularly year‑round to circulate oil and keep seals happy, and the Dualis will stay crisp and comfy from the Gold Coast to the Cape, or down to the Catlins.

Does the 2009 Nissan Dualis have a TX valve?

Yes. Nissan’s J10 Electronic Service Manual (HA section) depicts a thermostatic expansion valve on the evaporator, and Nissan FAST lists a valve assembly for the Dualis/Qashqai J10. DENSO application data for 2007–2013 models also specifies a TXV system.

What are the signs the TX valve is failing on a Dualis?

Expect weak cooling at idle, evaporator icing, odd pressure readings (high high‑side with starved low‑side), temperature hunting, and hissing near the dash. A proper gauge set and thermometer check will confirm if it’s metering poorly versus a fan or condenser issue.

Can the TX valve be replaced without pulling the whole dash?

Typically yes. On the J10, the lines are undone at the firewall and access is via the passenger side by removing trim and the evaporator cover, not a full dash‑out. It still requires refrigerant recovery, new O‑rings, correct torque, evacuation, and recharge by weight—best left to an air‑con specialist.