Parts for your 2004 Honda Accord-Tx valve

2004 Honda Accord TX-valve: what it does, where it lives, and how to look after it

Technical sources confirm the 2004 Honda Accord (including CM/CL chassis and Accord Euro/TSX equivalents) is factory-fitted with a thermal expansion valve (TX-valve). The Honda workshop manual for 2003–2007 Accord lists “Thermal Expansion Valve Replacement” in the HVAC section, Honda’s electronic parts catalogue (EPC) shows “Valve Set, Expansion” for CM/CL models, and OEM supplier catalogues (DENSO) and aftermarket fitment guides (e.g., Four Seasons, Nissens) all specify an expansion valve at the evaporator inlet for this model. So, yes—this Accord uses a TX-valve, not an orifice tube.

On a 2004 Accord, the TX-valve’s job is to precisely meter how much R‑134a enters the evaporator. It reacts to evaporator outlet temperature and pressure, keeping the coil cold without letting it ice up. That means quicker cool-down on hot days, steadier vent temps in traffic, and less compressor cycling. It’s a small part with a big say in comfort and efficiency.

When servicing the A/C, a healthy TX-valve helps maintain proper low- and high-side pressures and stable superheat. If the valve sticks or blocks, owners may notice weak cooling at idle, sudden swings from cold to warm air, frost on the evaporator line, or odd hissing. A licensed refrigerant technician can confirm with gauge readings and temperature drop checks.

Replacement is straightforward for a pro but involves the dash side of the system. On this Accord the TX-valve sits at the evaporator inlet behind the glovebox area, where the two A/C lines pass through the firewall. By law in AU/NZ, refrigerant must be recovered—not vented—so it’s a job for an ARCtick-licensed (or equivalently certified) technician. Best practice when the system is opened:

• Recover the charge, cap open lines, and replace the receiver/drier or desiccant element.
• Fit a quality TX-valve, new green O-rings lubricated with the correct PAG oil, and torque to the service manual spec.
• Evacuate (deep vacuum) to boil off moisture, then recharge by weight to the sticker under the bonnet.
• If the compressor has failed, flush lines and the condenser as specified, or replace the condenser if it’s a parallel-flow type that can’t be reliably flushed.

Regularly replacing the cabin filter and keeping condenser fins clean helps the TX-valve do its thing. With correct charge, clean airflow, and moisture control, the 2004 Accord’s TX-valve will quietly keep the cabin comfy for years.

Popular questions about 2004 Honda Accord TX-valve

Does a 2004 Honda Accord use a TX-valve or an orifice tube?
This model uses a thermal expansion valve at the evaporator inlet, not an orifice tube. That design lets the system adjust flow on the fly for steadier cooling and better performance in varying conditions.

Where is the TX-valve located on a 2004 Accord?
It’s mounted at the evaporator inlet behind the dash on the passenger side, effectively behind/near the glovebox where the A/C pipes enter from the firewall. Access usually involves glovebox removal and working at the evaporator connections.

What typically causes TX-valve issues on these cars?
Moisture, debris from compressor wear, degraded desiccant, or incorrect oil can make a valve stick or plug. Long periods of disuse can also gum things up. Using the right oil, replacing the receiver/drier when the system is opened, and charging by weight help the valve stay reliable.