Parts for your 2006 Toyota Caldina-Tx valve

2006 Toyota Caldina TX Valve (Thermal Expansion Valve)

Yes, the 2006 Toyota Caldina uses a thermal expansion valve (TX valve/TXV) in its air-conditioning system. This is supported by Toyota’s Electronic Parts Catalogue for the T24# series, which lists an A/C expansion valve within the evaporator and heater assembly, and the Caldina T24# Repair Manual (Air Conditioning section), which diagrams the TXV at the evaporator inlet. DENSO technical literature for R‑134a Toyota passenger vehicles with a receiver–drier layout also specifies a TXV-controlled system.

The TX valve’s job is to meter the exact amount of R‑134a into the evaporator based on temperature and pressure, keeping superheat in the sweet spot. That means colder, steadier vent temps in summer without the evaporator icing up. On the Caldina, it’s part of a DENSO system designed for efficiency and quick cool-down, ideal for long Kiwi and Aussie drives.

It’s not a routine “service item”, but its performance depends on the system being clean, correctly charged, and run regularly. A clogged cabin filter, low refrigerant, or moisture in the circuit can make a good TXV look bad. Best practice is to run the A/C weekly to keep seals lubricated, replace the cabin filter on schedule, and have a licensed tech check pressures and vent temps if cooling isn’t up to scratch.

• Common signs the TXV may need attention: weak or uneven cooling (worse at idle, better on the open road), vent temps that swing hot–cold, frosting on the evaporator or lines, hissing or whooshing at the dash, and odd high/low gauge readings during diagnosis.

When replacement is on the cards, the right approach saves headaches:

1. Recover the refrigerant properly, don’t vent it.
2. Access the evap case (typically via the passenger side/glovebox area) per the Caldina T24# A/C procedure.
3. Swap the TXV and always fit new, correct-size O‑rings lightly lubricated with the specified PAG oil for your compressor.
4. If the system’s been opened, replace the receiver–drier and fit new insulating foam on the valve bulb where applicable.
5. Evacuate deeply, verify it holds vacuum, then recharge by weight to the under‑bonnet label spec with R‑134a.
6. Leak‑test (nitrogen and soapy water or an electronic detector), check superheat and vent temps, and confirm condenser fans cut in as they should.

Handled this way, the Caldina’s TXV will keep doing its thing quietly for years, keeping everyone comfy from the first kilometre.

Popular questions

Where is the TX valve on a 2006 Toyota Caldina?
The TXV is mounted at the evaporator block inside the HVAC case, typically behind the glovebox area. The refrigerant lines pass through the firewall to the engine bay, the valve sits on the cabin side where those lines meet the evaporator.

What refrigerant and oil does it use?
The Caldina uses R‑134a. Charging is always by weight to the figure on the under‑bonnet label. Use the compressor‑specified PAG oil type and quantity listed in the A/C service data, don’t mix oils.

Do I need to replace the receiver–drier when changing the TX valve?
Yes, it’s strongly recommended any time the system is opened. The drier traps moisture and debris, a fresh one protects the new TXV and compressor, and helps ensure stable pressures and colder vent temps.