Parts for your 2002 Toyota Rav4-Tx valve

2002 Toyota RAV4 TX Valve (Thermostatic Expansion Valve)

Yes, the 2002 Toyota RAV4 is fitted with a thermostatic expansion valve (TX valve). This is confirmed in Toyota’s RAV4 (ACA20/21) Repair Manual under the Air Conditioning – Cooling Unit section, which details the “cooler expansion valve” at the evaporator inlet, and by Toyota’s Electronic Parts Catalogue listing a “Valve Sub-Assy, Cooler Expansion” for this model. DENSO’s OEM HVAC documentation also outlines TXV-based systems for Toyota applications of this era.

On this RAV4, the TX valve lives at the evaporator inlet, tucked behind the glove box inside the HVAC case. Its job is to meter liquid refrigerant into the evaporator based on temperature sensed by a bulb and the pressure at the outlet, keeping superheat in the sweet spot. That balance helps prevent evaporator icing, keeps vent temps nice and cold even at idle, and protects the compressor from liquid floodback. Compared with fixed-orifice setups, a TXV offers sharper control across Aussie and Kiwi climates, from cold mornings to scorching arvos.

There’s no routine maintenance for the valve itself, but a healthy system keeps it happy. During servicing, a tech should check for correct charge by weight, stable low- and high-side pressures, and consistent vent temps. If the system is opened, new O-rings should be fitted and the receiver/drier (often integrated in the condenser on this generation) replaced to manage moisture. Running the A/C regularly year-round also helps keep seals conditioned.

Replacement is a straightforward job for a licensed air-con technician. In Australia and New Zealand, refrigerant recovery and charging must be done by appropriately licensed personnel. The usual steps are: recover the R134a, remove the glove box and access panels, disconnect and cap the lines at the TXV, swap the valve and O-rings (lightly lubricated with the correct PAG oil grade specified for the RAV4), reassemble with proper torque, evacuate to deep vacuum, then recharge to the factory-specified weight shown on the under-bonnet label. It’s smart practice to replace the receiver/drier at the same time and leak-test with nitrogen and an electronic detector before recharging.

• Common signs the TXV may be acting up: weak cooling at idle, very cold then suddenly warm air, evaporator icing, compressor short-cycling, or abnormal pressure readings.
• Best practices: keep the system sealed, cap service ports, replace the drier whenever the circuit is opened, and flush if there’s compressor debris.

Popular questions

Does a 2002 RAV4 use a TX valve or an orifice tube?
It uses a thermostatic expansion valve at the evaporator, not an orifice tube/accumulator system. This layout is documented in the Toyota RAV4 (ACA20/21) Repair Manual and the Toyota parts catalogue as a “cooler expansion valve”.

Where is the TX valve on a 2002 RAV4?
It’s mounted at the evaporator inlet inside the HVAC case behind the glove box. You’ll see two refrigerant lines bolted to a compact H-block style valve once the glove box and access covers are removed.

Should the receiver/drier be replaced when changing the TX valve?
Yes. Any time the A/C circuit is opened, replacing the receiver/drier is recommended to control moisture and protect the TXV and compressor. On many RAV4s of this generation the drier is part of the condenser assembly.