Parts for your 2010 Honda Elysion-Tx valve

2010 Honda Elysion TX Valve: Fitment, Purpose and Service Tips

Based on technical literature, the 2010 Honda Elysion uses a thermostatic expansion valve (TXV). The Honda Elysion (RR-series) factory service manual and the Honda Electronic Parts Catalogue list an “Expansion Valve” at the evaporator, and DENSO’s automotive A/C training material describes Honda’s use of TXV-type systems. Many Elysion grades with rear air also carry a second TXV for the rear cooler unit. So a TX valve is absolutely relevant and fitted on the 2010 Elysion.

On the Elysion, the TX valve’s job is to meter liquid R134a into the evaporator and hold a target superheat, keeping the evaporator cold without letting liquid flood back to the compressor. That control is what keeps vent temps stable in stop–start traffic and on the open road, even during hot Aussie and Kiwi summers. For variants with dual air, each evaporator has its own TXV, letting the front and rear zones cool efficiently with different loads.

The TXV itself isn’t a scheduled replacement item, but it’s central to air-con performance. If cabin cooling is weak, fluctuates, or the system ices up, testing should confirm whether the valve is sticking or restricted rather than, say, a condenser fan, blend door or low refrigerant issue. Typical diagnosis involves manifold gauge readings, temperature drop checks across the evaporator inlet/outlet, and inspecting for frost or sweating on the lines.

When replacement is required, best practice on the Elysion is to renew the O-rings, replace the receiver/drier or desiccant element, evacuate with a deep vacuum, and recharge with the specified R134a mass and the correct PAG/ND-OIL per Honda’s spec. The front TXV is mounted at the front evaporator (accessed via the HVAC case behind the glovebox area on most trims), while rear A/C models place the second TXV at the rear cooler unit. Careful torque on the flare/bolt connections prevents leaks and avoids crushing the sealing faces. If the system has seen compressor debris, line flushing and condenser inspection are a must.

Good workshop habits help the TXV live a long life: cap open lines to keep moisture out, nitrogen pressure-test and leak check before charging, and keep the cabin filter and condenser clean so the system isn’t working overtime. If in Australia or New Zealand, refrigerant recovery and charging should be handled by a licensed air-con technician.

• Replace the TXV if there’s persistent icing at the evaporator inlet, wildly swinging low-side pressure, or a confirmed stuck-open/closed valve.
• Always pair TXV replacement with new O-rings and a fresh drier/desiccant, then evacuate and recharge to the exact spec.

Technical sources referenced: Honda Elysion (RR-series) factory service manual HVAC section, Honda Electronic Parts Catalogue (EPC) HVAC listings, DENSO Automotive A/C Technical Training materials on TXV systems.

Popular questions

Does the 2010 Honda Elysion have one or two TX valves?
Most Elysions with rear air-con have two TXVs—one at the front evaporator and another at the rear cooler unit. Single-evaporator grades run a single TXV. A quick tell is whether the vehicle has rear A/C controls and underfloor refrigerant lines running to the rear quarter.

What symptoms point to a failing TX valve on an Elysion?
Owners often notice weak or inconsistent cooling, frost forming on the evaporator inlet or lines, and low-side pressure readings that swing or stay abnormally high/low. The cabin may cool fine on the highway but struggle at idle, or vice versa. Proper gauge and temperature diagnostics help confirm the TXV rather than a charge or airflow issue.

Can a TX valve be cleaned or adjusted, or should it be replaced?
The TXV isn’t adjustable, and cleaning rarely restores proper metering if it’s contaminated or worn. Replacement with an OE-quality valve is the reliable fix, ideally alongside a fresh receiver/drier or desiccant, line flushing if needed, and a precise vacuum and recharge performed by a licensed air-con technician.