Parts for your 1999 Toyota Caldina-Tx valve

1999 Toyota Caldina TX valve — what it does and how to look after it

Based on Toyota technical literature and parts data, the 1999 Toyota Caldina is fitted with a thermostatic expansion valve (TX valve). Toyota’s Electronic Parts Catalogue lists a “Valve, Expansion” (PNC 88515) for T210/T215 Caldina models, and the Toyota A/C service section for the Caldina platform details cooler expansion valve removal/installation at the evaporator. Denso’s passenger-vehicle A/C training materials also note that Toyota systems of this era commonly use a TXV rather than a fixed orifice tube.

The TX valve on a ’99 Caldina meters liquid R134a into the evaporator, adjusting flow based on evaporator outlet temperature and pressure. That keeps the evaporator fed just right—enough refrigerant to soak up heat without flooding the compressor with liquid. When it’s behaving, cabin temps stay steady, the glass demists quickly, and the compressor doesn’t have to work any harder than it should.

As part of regular servicing, it’s smart to keep an eye on TX valve performance. Tell-tales of a sticky or failing valve include weak cooling at idle then too-cold at speed, evaporator or suction-line icing under the bonnet, rapid vent-temperature swings, or odd high/low gauge readings during a professional check. Contamination (desiccant breakdown, moisture, or debris) is the usual culprit, so cleanliness and correct oil management are everything.

If the system is opened for any reason, a licensed air-con technician should recover the gas, replace the receiver/drier, renew O-rings (lightly lubricated with the correct PAG oil), and pull a deep vacuum before recharging to the specified R134a charge mass. Access to the Caldina’s TX valve is typically at the evaporator connections (cabin side of the firewall or behind the glovebox area, depending on variant). The valve is a block-type unit clamped to the evaporator fittings, follow the Toyota torque specs in the service manual when refitting.

Best practice for longevity:

• Have the system inspected and the cabin filter checked so airflow across the evaporator stays healthy.
• Fix leaks early—low charge can drive the TX valve to extremes and invite icing.
• Any time the compressor is replaced or metal contamination is suspected, flush appropriate lines, replace the TX valve and receiver/drier together, and balance the oil.
• Always use a licensed technician for refrigerant work to meet AU/NZ regulations and avoid moisture ingress.

Done properly, a fresh, correctly metering TX valve helps the Caldina’s air-con run colder, quieter, and with fewer dramas for years.

Does a 1999 Toyota Caldina use a TX valve or an orifice tube?

It uses a thermostatic expansion valve. Toyota’s parts catalogue for T210/T215 Caldina models lists an expansion valve at the evaporator, which is typical of Denso/Toyota systems from this era.

Where is the TX valve located on a 1999 Caldina?

It’s mounted at the evaporator inlet/outlet connections, generally accessed from behind the glovebox area or at the firewall junction depending on trim. The valve is a small block secured to the evaporator pipes.

When should the TX valve be replaced?

Replace it if there’s confirmed internal contamination, persistent cooling instability, icing issues, or during major A/C repairs like compressor replacement. Always pair TX valve replacement with a new receiver/drier and proper evacuation and recharge by a licensed technician.