Parts for your 2019 Honda Accord-Tx valve

2019 Honda Accord TX‑valve: purpose, servicing and when to replace

Technical sources confirm the 2019 Honda Accord is fitted with a thermal expansion valve (TX‑valve). Honda’s factory Service Information for the 2018–2020 Accord includes an “Expansion Valve Replacement” procedure in the HVAC section, the Honda Genuine Parts catalogue lists a “Valve Assy., Expansion” for this model (commonly referenced as P/N 80221‑TVA‑A41), and independent service databases such as ALLDATA and Mitchell1 identify a TXV‑type A/C system on this generation. That makes the TX‑valve absolutely relevant to any air‑con diagnosis or service on a 2019 Accord.

The TX‑valve’s job is to meter refrigerant into the evaporator based on temperature and pressure, keeping superheat in the sweet spot. By balancing flow, it prevents the evaporator from freezing, stops liquid refrigerant from flooding back to the compressor, and keeps cabin outlet temps stable. On late‑model systems that usually run R‑1234yf refrigerant, a healthy TXV helps the Accord deliver quick cool‑down and efficient performance without the compressor working harder than it needs to.

There’s no scheduled maintenance for the TX‑valve itself, but it can wear or stick due to contamination, moisture, or incorrect oil/refrigerant charge. Common clues include weak cooling at idle then sudden cold bursts, frosting at the evaporator inlet, compressor cycling too often, or uneven pressure readings during diagnosis. If the valve is leaking or stuck, replacement is the fix—this job involves refrigerant recovery, so it must be done by an ARCtick‑licensed technician. Best practice during TXV replacement is to renew the O‑rings, add the correct amount of PAG oil for any components replaced, vacuum the system thoroughly, and recharge to the exact capacity shown on the under‑bonnet label. It’s also wise to replace the desiccant bag in the condenser (or the condenser assembly where the bag isn’t serviceable) whenever the system’s been open, to keep moisture at bay.

To keep the TX‑valve and the rest of the air‑con happy between services: run the A/C for 10–15 minutes weekly to circulate oil, keep the cabin filter fresh so airflow across the evaporator stays spot‑on, and make sure the condenser isn’t clogged with debris. If performance drops or pressures look off on a gauge set, get it checked before it snowballs into a compressor drama.

Where is the TX‑valve on a 2019 Accord?

It’s mounted at the evaporator, inside the HVAC case behind the dash. The refrigerant lines pass through the firewall on the passenger side. Access typically starts by removing the glovebox and related trim to reach the valve and line connections.

What are the signs the TX‑valve is failing?

Intermittent cooling, noticeable frosting at the evaporator inlet, a hiss at the firewall, rapid compressor cycling, and pressure readings that are abnormally low on the low side or high on the high side are all red flags. A thorough diagnostic with gauges and a leak test confirms it.

Do I need to replace the drier when changing the TX‑valve?

Yes—good practice is to renew the desiccant. On many 2019 Accords the desiccant is inside the condenser, depending on market parts availability, that means replacing the desiccant bag or the condenser assembly. Your technician will advise the correct approach for your vehicle.