Parts for your 2010 Nissan Serena-Tx valve

2010 Nissan Serena TX Valve

Technical references confirm the 2010 Nissan Serena is fitted with a thermostatic expansion valve (TX valve/TXV). The Nissan Serena C25/C26 service manual (Heater & Air Conditioning – HA) diagrams show an expansion valve mounted at the evaporator, and the Nissan FAST electronic parts catalogue lists an “Expansion Valve Assy” for these models, including variants with front and rear air-conditioning. OE supplier catalogues (DENSO/Keihin) likewise catalogue a TXV for the Serena of this era. So, the TX valve is relevant and part of the Serena’s A/C system architecture.

The TX valve’s job is simple but critical: it meters the flow of refrigerant into the evaporator based on temperature at the outlet, keeping evaporator pressure in the sweet spot so the cabin gets consistently cold air without icing. On many Serenas with dual air, there’s a front TXV at the dash evaporator and a second TXV for the rear unit. If the TXV sticks, underfeeds, or overfeeds, owners will notice uneven cooling, frosty lines, or weak performance at idle.

As part of routine servicing, the TXV doesn’t need periodic replacement, but it does deserve attention when A/C performance drops. A licensed A/C technician (ARCtick in Australia or a certified tech in New Zealand) should check pressures, superheat, and sensor readings. If the valve is restricted or its bulb charge has failed, replacement is the go. It’s best practice to replace the receiver-drier/desiccant at the same time, renew the O-rings, flush if contamination is suspected, evacuate to the correct vacuum, and recharge to the specified refrigerant mass.

Good cues to book the Serena in for a TXV assessment include:

• Cold air only while driving, not at idle, or a noticeable temp swing left to right vents
• Frost or sweat on the evaporator pipes, or a hissing/whistling at the case
• Gauge readings showing low suction with normal/high discharge (underfeeding) or high suction with poor cooling (overfeeding)

For dual A/C models, a tech should evaluate both valves. If the rear system is weak while the front is fine, the rear TXV or its sensing bulb mounting is often the culprit. Using OE-quality valves, torquing to spec, correctly positioning the sensing bulb with proper insulation, and verifying blend-door operation will keep the Serena’s air-con performing during Aussie summers and chilly Kiwi mornings.

Popular questions

Where is the TX valve on a 2010 Nissan Serena?

It’s mounted at the evaporator outlet. On the front unit, that’s within or just ahead of the HVAC case behind the dash. Dual A/C models also have a rear TXV near the rear evaporator, typically behind interior trim in the rear quarter area. Access varies by trim and market spec, so interior panel removal is usually required.

Do both TX valves need replacing on dual A/C Serenas?

Not always. A technician will diagnose front and rear performance separately. If only one circuit shows incorrect superheat or flow, that single TXV can be replaced. However, on high‑kilometre or contaminated systems, doing both and replacing the drier can save repeat labour.

Can a blocked TX valve be cleaned instead of replaced?

If debris or moisture has caused sticking, cleaning is rarely reliable. The standard fix is to replace the TXV, renew the receiver-drier, and flush the circuit if contamination is present. Skipping these steps can lead to repeat blockages and poor cooling.