Parts for your 2001 Daihatsu Yrv-Tx valve

2001 Daihatsu YRV TX Valve: What it is and how to look after it

Yes, the 2001 Daihatsu YRV is fitted with a thermostatic expansion valve (TX valve/TXV). Technical references that confirm this include the Daihatsu YRV (J102G/J122G) workshop manual’s Air Conditioning section, the Daihatsu Electronic Parts Catalogue listing a “Valve, Expansion” in the cooling unit, and DENSO’s aftermarket HVAC catalogue for the YRV. These sources place the TXV at the evaporator inlet inside the HVAC case, typically accessed from behind the glovebox.

The TX valve’s job is to meter the flow of R134a into the evaporator, reacting to temperature and pressure so the evaporator runs at the right superheat. That keeps cabin temps stable, improves efficiency in Aussie and Kiwi summers, and helps prevent compressor damage from liquid slugging. In short, it’s the brains of the cold side of the A/C system.

It’s not a regular maintenance item, but it should be checked if the YRV blows warm at idle then gets cold on the move, ices up lines near the firewall, cycles oddly, or shows abnormal high/low side pressures. Any time the system is opened—especially after a compressor failure—the TXV, receiver-drier (or desiccant bag), and all disturbed O-rings should be replaced, followed by a proper vacuum and recharge to the under-bonnet charge spec.

Replacement is a tidy-up job rather than a brute-force one. The system must be recovered by a licensed technician, the evaporator housing opened, and the block-type TXV unbolted from the evaporator core connections. Keep everything surgically clean, match the new valve like-for-like, lubricate new O-rings with the correct PAG oil, and tighten fasteners to workshop-manual guidance—not “by feel”. Once reassembled, the system needs a deep vacuum, a leak check, then an accurate R134a charge. It’s worth replacing any crumbling foam insulation around sensing bulbs or lines to prevent sweating and maintain proper control.

• Typical symptoms of a dud TXV: poor cooling at idle, frost on the evaporator or suction line, erratic vent temps, or pressure readings that don’t stabilise.
• Good practice: renew the receiver-drier whenever the circuit’s opened, and always keep moisture and grit out of the lines.

Done right, a fresh TXV helps the 2001 YRV deliver crisp, consistent chill without overworking the compressor.

FAQs

Does the 2001 Daihatsu YRV use a TX valve or an orifice tube?
It uses a thermostatic expansion valve mounted at the evaporator inlet. This configuration is shown in the YRV workshop manual and parts catalogue, which list an expansion valve within the cooling unit assembly.

Where is the TX valve located on a 2001 YRV?
It sits at the evaporator inlet inside the HVAC case, generally accessed by removing the glovebox and opening the evaporator housing. Line up replacement O-rings carefully and keep the area clean to avoid leaks.

When should the TX valve be replaced?
Replace it if it’s sticking or restricted (symptoms include icing, warm-at-idle cooling, or unstable pressures), or whenever the system is opened after a compressor failure. Always renew the receiver-drier and have the system evacuated, vacuumed, and recharged by a licensed A/C specialist.