Parts for your 2012 Toyota Land cruiser-Tx valve

2012 Toyota Land Cruiser TX Valve (Thermostatic Expansion Valve)

Based on Toyota’s technical literature and parts data, the 2012 Toyota Land Cruiser 200 Series is fitted with a thermostatic expansion valve (TX valve). The Toyota Repair Manual for the Land Cruiser 200 (A/C section: Cooler Expansion Valve – front, and, where equipped, rear) and the Toyota Electronic Parts Catalogue list a “Cooler Expansion Valve” for this model year, with separate valves for front and rear air-con on dual A/C variants. DENSO application catalogues for J200 models (R‑134a systems) also specify a TXV rather than an orifice tube, confirming the TX valve is relevant and used on this vehicle.

The TX valve on a 2012 Land Cruiser meters refrigerant into the evaporator based on evaporator outlet temperature and pressure. By throttling flow on the high-to-low side, it keeps the evaporator cold without freezing, giving steady cabin temps even when the weather swings from a frosty morning to a scorching arvo. On 200 Series wagons with rear air-con, there’s a separate rear TXV doing the same job for the back rows.

During regular servicing, the TX valve isn’t a typical “replace on schedule” item. Instead, it’s inspected as part of overall A/C performance. If the air-con cools poorly at idle, cycles erratically, shows uneven vent temps, or pressures look off on the gauges (e.g., low suction with normal/high head), the TXV can be a suspect. Contamination after a compressor failure can also jam the valve.

• Common symptoms of a crook TXV: weak cooling, evaporator icing, rapid clutch cycling, or hissing at the evaporator with low cooling output.
• Good practice: whenever the system’s opened, replace O-rings, evacuate properly, and recharge by weight with R‑134a. Add the correct PAG oil type/amount per Toyota specs.

Replacement is straightforward for a trained tech but fiddly: recover the refrigerant, access the evaporator connections (behind the dash for front, rear quarter trim for rear A/C), remove the valve and O-rings, then fit the new valve to factory torque. Because moisture and debris are the TXV’s enemies, it’s wise to replace the receiver/drier or desiccant when the system’s opened. After refit, a deep vacuum, accurate charge by weight, and a leak check are non-negotiable. Owners who tour long distances across Aus or NZ might add an A/C performance check every couple of years—keeping the system clean and correctly charged gives the TXV an easy life and the cabin ice-cold when it counts.

FAQs

Where is the TX valve located on a 2012 Land Cruiser?

On models with front A/C only, the TX valve sits at the evaporator inlet in the HVAC box behind the dash, accessed from the engine bay side of the firewall lines and/or by partial dash access. On dual A/C setups, there’s a second TXV mounted near the rear evaporator, typically behind the right rear quarter trim.

Do I need to replace the TX valve during a compressor change?

It’s highly recommended. A failed compressor can shed debris that sticks the TXV. Replacing the TXV along with flushing lines, fitting a new receiver/drier or desiccant, and charging with the correct oil and R‑134a helps protect the new compressor and restores proper flow control.

What refrigerant and oil does the 2012 Land Cruiser use?

The 2012 200 Series uses R‑134a refrigerant. Oil type and quantity depend on the exact system and component work, a DENSO-spec PAG oil (e.g., ND‑OIL 8 equivalent) is typical. Always follow the Toyota service manual for the precise oil amount after component replacement.