Parts for your 2019 Toyota Land cruiser-Tx valve

2019 Toyota LandCruiser TX Valve (TXV) — what it does and how to look after it

Based on Toyota’s LandCruiser 200 Series repair literature (cooler expansion valve sections, 2016–2021), the Toyota Electronic Parts Catalogue diagrams for J200 front and rear cooler units, and DENSO automotive A/C fundamentals on thermostatic expansion valves, the 2019 LandCruiser runs a TX valve at the front evaporator, and another at the rear evaporator on dual A/C models. So yes, a TXV is definitely used on this vehicle rather than an orifice tube setup.

The TX valve meters refrigerant into the evaporator, reacting to evaporator outlet temperature and pressure to keep the coil just on the edge of icing for maximum cooling and efficiency. On a 2019 LandCruiser (AU/NZ models typically using R‑134a, always check the under‑bonnet label), that precise control helps deliver steady cabin temps whether it’s towing up the Hume or crawling a beach track in Northland.

Signs the TXV might be playing up include:

• Warm air at idle but cooler air on the move, or temps that hunt hot–cold.
• Evaporator icing, hissing at the case, or poor rear A/C performance (rear TXV).
• Gauge readings showing very low suction with normal/high head pressure, or vice versa.

When servicing: a licensed A/C tech should recover the gas (ARCtick rules in AU/NZ), leak‑check, and confirm operation with manifold gauges and scan‑tool data. If the TXV is replaced, new O‑rings should be fitted and lightly lubricated with the correct PAG oil (ND‑Oil 8 for most DENSO compressors used on LC200). Evacuate the system thoroughly and recharge by weight. Where the receiver/drier is integrated into the condenser, replace the desiccant or condenser assembly if the system has been open or contaminated.

Front TXV access is typically via the HVAC case behind the glovebox, rear TXV sits near the rear evaporator in the left rear quarter—trim removal required. Budget several hours for the front, and additional time for the rear on seven/eight‑seater models. After reassembly, run the system, verify vent temps, check for frosting patterns, and perform any required climate control initialisation so blend doors behave properly.

Preventative care is simple: keep the condenser clean, run the A/C regularly year‑round, and address small leaks early. If the system’s been exposed to air or shows metal debris from a failing compressor, the TXVs should be replaced along with a thorough flush to avoid repeat dramas.

• Popular questions about 2019 LandCruiser TX valves

Where is the TX valve on a 2019 LandCruiser?

The front TXV sits on the evaporator outlet/inlet at the HVAC case behind the glovebox area. Vehicles with rear air have a second TXV mounted at the rear evaporator in the left rear quarter panel. Access needs dash/glovebox and rear trim removal.

What refrigerant and oil does it use?

Most AU/NZ 2019 LandCruiser 200 models use R‑134a with DENSO ND‑Oil 8 (PAG). Always confirm the refrigerant and any oil top‑up specs on the under‑bonnet label and in the Toyota repair manual for the exact variant.

Do front and rear A/C systems share a single TX valve?

No. Dual A/C models have separate front and rear TXVs. Replace the faulty one only, unless the system is contaminated (e.g., compressor failure), in which case both valves and the drier/desiccant should be renewed.