Parts for your 2014 Honda Odyssey-Tx valve

2014 Honda Odyssey TX valve: what it does and when to sort it

Based on technical references, the 2014 Honda Odyssey uses a thermal expansion valve (TXV) for its air-conditioning. Models with rear A/C are fitted with a second, rear TXV. Sources that confirm this include:

• Honda Odyssey 2011–2017 Service Manual (HVAC section): diagrams and procedures show a front evaporator expansion valve and a separate rear expansion valve on dual-A/C variants.
• Honda OEM parts catalogues for 2014 Odyssey: evaporator and rear A/C diagrams list “Valve Assy., Expansion” for front and rear assemblies.
• Aftermarket application data (DENSO, Four Seasons) and repair databases (ALLDATA/Mitchell1) list front and rear expansion valves and labour operations for this model.

The TXV’s job is to precisely control how much refrigerant flows into the evaporator, reacting to temperature and pressure so the system cools efficiently without freezing up. On the 2014 Odyssey running R‑134a, the front TXV manages the dash vents, if the vehicle has rear air, the rear TXV meters refrigerant for the back-row evaporator too. When a TXV sticks or clogs (often from moisture or compressor debris), you’ll notice weak cooling, frost on lines, uneven vent temps, or odd high/low gauge readings.

TXVs aren’t a routine “service item”, but they should be addressed if there are cooling complaints or after major A/C work. For the front TXV, access is at the evaporator inside the HVAC case, which is a labour-heavy, dash-area job. The rear TXV sits at the rear evaporator (right-hand quarter trim on most trims), making it a separate task. Best practice when replacing a TXV includes: recovering refrigerant, replacing related O‑rings, using the correct torque, checking and balancing oil quantity, replacing the receiver/drier or desiccant, evacuating to deep vacuum, and recharging to the label spec under the bonnet. If a compressor has failed (black death), flush where appropriate and consider replacing both TXVs to prevent recurring issues.

To keep the system happy, change the cabin filter on schedule, keep the condenser clean, and run the A/C regularly—even in winter. If the Odyssey’s cooling is playing up, a licensed A/C tech can pressure-test, diagnose the TXV’s behaviour, and sort it with the right gear.

Popular questions

Does the 2014 Odyssey have one or two TX valves?
Most NZ/AU-delivered 2014 Odysseys with rear A/C have two TXVs—one up front and one for the rear evaporator. Base variants without rear air just have the single front TXV. A quick look for rear A/C controls and roof/side vents will usually tell the story.

What are the signs a TX valve is failing on an Odyssey?
Common clues include poor cooling at idle, very cold then warm swings, frost on the evaporator lines, or pressure readings that don’t settle. After a compressor failure, debris can clog the valve screens, so if cooling drops off after that repair, the TXV is a prime suspect.

Can a TX valve be cleaned, or does it need replacing?
If contamination is minor, flushing the system and replacing the receiver/drier may help, but a sticking or blocked TXV is typically replaced. It’s a sealed precision device, once worn or fouled, fitting a new valve saves time and reduces call-backs.