Parts for your 2016 Nissan Serena-Tx valve

2016 Nissan Serena TX Valve (Thermostatic Expansion Valve)

Based on the Nissan Serena C26 Series Factory Service Manual (HA: Heater & Air Conditioning), the Nissan FAST parts catalogue for C26, and DENSO aftermarket cataloguing for Serena (2010–2016), the 2016 Nissan Serena is fitted with a thermostatic expansion valve (TX valve) at the evaporator – and on dual A/C models, a rear TX valve as well. So a TX valve is absolutely relevant to the 2016 Serena’s air-con system.

For the 2016 Nissan Serena, the TX valve is the quiet achiever that keeps the cabin cool without fuss. It meters the flow of liquid refrigerant into the evaporator, reacting to temperature and pressure so the evaporator sits at the sweet-spot “superheat”. That means stable, cold air at the vents in summer traffic and on the open road, whether the van runs front A/C only or front and rear air for the whole crew. The Serena’s block-style TXV is matched to R134a on this model year and is mounted at the evaporator outlet, with a second valve at the rear unit on dual-zone variants.

When a TX valve starts to play up, it often shows as lukewarm or fluctuating vent temps, frosting on the evaporator or suction line, a hissing or chattering sound near the case, or odd pressure readings during an A/C test (starved or flooded evaporator). Leaving it too long can stress the compressor, so it’s worth sorting early.

Replacement is a straightforward job for a licensed tech (ARCtick in AU or appropriately certified in NZ): recover the refrigerant, access the evaporator case (front under the dash, rear unit typically behind left rear trim), swap the valve, renew O-rings, torque correctly, evacuate, and recharge by weight to spec. If the system’s been open or contaminated, factor in a receiver–drier replacement and a flush where appropriate. Using OE or OE-quality valves (e.g., Nissan/DENSO) and new green HNBR O-rings is the go.

• Service tips: keep the cabin filter fresh to maintain airflow across the evaporator and reduce icing risks.
• Operate the A/C regularly year-round to circulate oil and keep seals healthy.
• Book an A/C check every couple of years – leak test, performance check, and a proper regas if needed.

DIY? The dash access and refrigerant handling make this one best left to the pros. Done right, a new TX valve will restore crisp, consistent cooling and protect the Serena’s compressor for the long haul.

Popular questions about 2016 Nissan Serena TX valves

Where is the TX valve on a 2016 Nissan Serena?
The front TX valve sits on the evaporator in the HVAC case behind the dash, accessible once the glovebox/dash trim and case sections are removed. On dual A/C models, there’s a second TX valve mounted at the rear evaporator unit, usually behind the left rear quarter interior trim.

What are the signs the Serena’s TX valve is failing?
Common giveaways include poor or inconsistent cooling, frost on the suction line or evaporator, rapid cycling, and abnormal manifold gauge readings (very low suction or unusually high head pressure). A competent A/C test will confirm if the TXV is sticking, restricted, or overfeeding.

Do you need to regas after replacing the TX valve?
Yes. The refrigerant must be professionally recovered before removal, and after the new valve and O-rings go in, the system needs a vacuum, leak check, and a recharge by weight to the factory spec to ensure correct superheat and performance.