Parts for your 2005 Toyota Echo|yaris-Tx valve

2005 Toyota Echo/Yaris TX‑Valve: What it does and how to look after it

Based on factory and aftermarket technical references, the 2005 Toyota Echo/Yaris (XP10 platform) with factory air‑conditioning uses a thermostatic expansion valve (TX‑valve), not a fixed orifice tube. The TX‑valve is mounted at the evaporator inlet in the HVAC case behind the glovebox. Sources that document this include:

• Toyota service information (Echo/Yaris A/C section): exploded views and parts lists show a “cooler expansion valve” at the evaporator.
• DENSO air‑conditioning application data for Echo/Yaris 1999–2005, listing a block‑type expansion valve for R134a systems.
• Major aftermarket catalogues (e.g., Four Seasons, Nissens, RANSU/DENSO OE service) which specify an A/C expansion valve for 2005 Echo/Yaris models.

On this model, the TX‑valve is the metering brain of the air‑con. It constantly adjusts how much liquid refrigerant is fed into the evaporator, keeping the outlet superheat in the sweet spot so the cabin gets cold without freezing the core. Because your Echo/Yaris runs R134a with a DENSO system, a healthy TX‑valve helps maintain quick pull‑down on hot arvos and steady vent temps in stop‑start traffic.

When the valve starts to act up, you’ll usually notice either weak cooling at idle that gets a tad better on the open road, or the opposite—overcooling and icing on the evaporator with misty vents. A tech checking pressures may see an unusually low low‑side and normal/high high‑side (restricted/stuck valve), or a lazy split across the valve (sticking open). Frost on the TX‑valve block or oily residue at the pipe joints can also hint at trouble.

If replacement’s on the cards, it’s a job for a licensed air‑con technician because the system must be safely recovered, evacuated and recharged. Access is typically via the glovebox area: the pipes are unbolted from the firewall side of the evaporator case and the block‑type TX‑valve is swapped out. Always use new O‑rings, add the correct amount of PAG oil (ND‑OIL 8 spec) for component change‑out, and pressure/evac test before re‑gassing with the factory R134a charge. It’s also smart to replace the receiver‑drier/desiccant element when the system’s opened, and to flush lines if there’s been any contamination.

As part of routine servicing, keep the condenser face clean, replace the cabin filter so airflow stays strong, and have the A/C performance checked yearly. Catching a lazy TX‑valve early saves the compressor from working overtime and keeps those summer drives comfy across Aus and NZ.

Does a 2005 Toyota Echo/Yaris use a TX‑valve or an orifice tube?

It uses a TX‑valve. Toyota’s documentation for the XP10 Echo/Yaris shows a “cooler expansion valve” at the evaporator inlet. Aftermarket catalogues for this model family list a block‑type TX‑valve as the metering device.

Where is the TX‑valve located on a 2005 Echo/Yaris?

It’s mounted at the evaporator inside the HVAC case behind the glovebox area. The refrigerant lines connect through the firewall to the valve block on the evaporator inlet/outlet.

What are the common symptoms of a failing TX‑valve on this model?

Poor cooling at idle, chilly then warm swings, evaporator icing, or uneven vent temps. On gauges, you might see a very low low‑side with normal/high high‑side (stuck/restricted), or low pressure split (stuck open). Frosting on the valve body or oily staining at the joints can also point to issues.