Parts for your 2002 Daihatsu Yrv-Tx valve

2002 Daihatsu YRV TX Valve — What It Does and When to Service It

Based on technical sources, the 2002 Daihatsu YRV uses a thermostatic expansion valve (TX valve/TXV) in its air-conditioning system. The Daihatsu YRV Workshop Manual (A/C section, 2000–2005), the Daihatsu Electronic Parts Catalogue for YRV J102-series models, and Denso’s A/C Components Catalogue and HVAC Fundamentals all identify a block-type TXV fitted at the evaporator inlet on this model. So the TX valve is absolutely relevant to the 2002 YRV’s cooling performance.

The TX valve’s job is simple but critical: it meters liquid refrigerant into the evaporator, matching flow to heat load so the evaporator stays cold without icing up. By sensing evaporator outlet temperature and pressure, it keeps superheat in the sweet spot. When the TXV sticks or drifts out of spec, owners will usually notice weak cooling, fluctuating vent temps, line frosting near the firewall, or odd pressure readings if gauges are fitted.

As part of regular servicing, the TX valve doesn’t have a fixed replacement interval, but it’s smart to inspect it whenever the system is opened, or if there are symptoms like:

• Poor cooling at idle or in traffic, better at highway speeds
• Rapid cycling of the compressor, hissing at the expansion block
• Frost or condensation on the suction line/evaporator case
• High high-side and low low-side pressures, or the opposite, on gauge tests

Replacement on a 2002 Daihatsu YRV typically involves accessing the HVAC case at the firewall, unbolting the TXV from the evaporator block, and renewing all O-rings. Any A/C work must be carried out by a licensed technician—venting refrigerant is illegal in Australia and New Zealand. Expect an evacuate, leak test, and recharge with the correct R-134a charge and manufacturer-specified PAG oil. It’s good practice to replace the receiver–drier whenever the system is opened to air, especially if the TXV has been contaminated by debris or moisture.

For longevity, keep the condenser clean, run the A/C regularly year-round to circulate oil, and address any belt slip or cooling fan issues early. A correctly functioning TX valve will give the YRV crisp, consistent chill, even on a scorcher.

Technical sources referenced: Daihatsu YRV Workshop Manual (A/C), Daihatsu Electronic Parts Catalogue (YRV J102/J102G), Denso A/C Components Catalogue, Denso HVAC Fundamentals.

Popular questions

Where is the TX valve on a 2002 Daihatsu YRV?
It’s mounted at the evaporator inlet, typically accessed at the firewall side of the HVAC case. The refrigerant lines bolt to a small block (the TXV) before entering the cabin evaporator. Interior trim or engine-bay components may need to be moved for access.

How often should the TX valve be replaced?
There’s no set interval. Replace it when there are performance issues, contamination, or whenever the system has been open and shows signs of moisture or debris. Many technicians pair TXV replacement with a new receiver–drier to protect the fresh valve.

What are common signs of a faulty TX valve on a YRV?
Inconsistent cooling, frosty lines, fluctuating pressures, or a compressor that short-cycles. A stuck-closed TXV gives weak cooling and low suction pressure, stuck-open can cause flooding, high suction pressure, and potential evaporator icing.