Parts for your 2011 Nissan Serena-Tx valve

2011 Nissan Serena TX Valve (Thermal Expansion Valve)

Yes — the 2011 Nissan Serena (C26) uses a thermal expansion valve (TX valve). Front air-con systems are fitted with an expansion valve at the evaporator, and models with rear air also have a second, rear TX valve. This is confirmed by technical sources including the Nissan Electronic Service Manual for C26 (HA – Heater & Air Conditioner) which details an “Expansion Valve” in the component layout and service procedures, Nissan FAST/Parts Catalog listings for Valve Assy–Expansion (commonly referenced as 92200-1VA0A for front and 92203-1VA0A for rear where equipped), and OE supplier catalogues that specify a TXV-type metering device for the C26 platform.

The TX valve is the metering heart of the Serena’s HVAC, regulating how much liquid refrigerant enters the evaporator. By reacting to evaporator outlet temperature and pressure, it keeps superheat in the sweet spot so the cabin cools quickly without flooding the core. On dual air models there’s a front and a rear valve, each managing its own evaporator for balanced cooling right through the cabin.

As part of regular servicing, a TX valve doesn’t need routine replacement, but it does benefit from a clean, dry, well-charged system. If the Serena’s A/C is cycling oddly, blowing warm at idle, frosting the evaporator line, or showing big pressure splits on the gauges, the TXV may be sticking or starved by moisture/debris. Because handling refrigerant is regulated, diagnosis and any replacement should be done by an ARCtick-licensed technician in Australia or an appropriately certified HVAC professional in New Zealand.

Best-practice when the system has been opened or contaminated:

• Replace the TX valve only after confirming metering faults — rule out low charge, weak compressor or blocked condenser first.
• Renew O-rings, add the correct PAG oil balance, and evacuate thoroughly to remove moisture.
• Weigh in the specified R134a charge, the C26 is sensitive to under/overcharge, especially with rear air.
• If the system’s been open to atmosphere, replace the desiccant (often integrated with the condenser on many Nissans).

For owners, the tell-tales to book an A/C check are uneven front/rear cooling, a chirp or hiss at the dash that doesn’t settle, icing on the low-side line, or slow pull-down on hot days. With the right charge and a healthy TX valve, a Serena keeps families comfy from school runs to long-haul summer trips.

Technical sources referenced:

• Nissan Electronic Service Manual (C26, 2010–2012), HA – Heater & Air Conditioner: Expansion Valve components and service procedures.
• Nissan FAST/Parts Catalog: Valve Assy–Expansion listings for front and rear (C26 Serena).
• OE supplier catalogues (e.g., DENSO) specifying TXV metering for Nissan C26 with front/rear evaporators.

Popular questions about the 2011 Nissan Serena TX valve

Where is the TX valve on a 2011 Serena?
On front A/C systems it’s mounted at the front evaporator, typically behind the dash near the heater box. Dual-air models also have a second valve near the rear evaporator, commonly accessed behind interior trim on the left-hand rear quarter. Access usually requires trim or dash removal.

Do all 2011 Serena models have two TX valves?
No. Serena variants without rear air use a single front TX valve. Trims with rear cooling have a dedicated rear evaporator and a second TX valve to manage that circuit, so parts and refrigerant charge differ between single- and dual-air cars.

What are the signs a TX valve needs replacing?
Common clues are poor cooling at idle, sudden temperature swings, icing at the evaporator/low-side line, and abnormal high/low-side pressures. After confirming correct refrigerant charge and condenser airflow, a sticking or blocked TXV is a prime suspect.