Parts for your 2018 Toyota Land cruiser-Tx valve

2018 Toyota Land Cruiser TX Valve: What It Does and When to Service It

Yes, the 2018 Toyota Land Cruiser 200 Series uses a TX (thermostatic expansion) valve in its air‑conditioning system. This is documented in Toyota’s Repair Manual for the Land Cruiser 200 Series (Air Conditioning section: “Cooler Expansion Valve – Front/Rear”), the Toyota Electronic Parts Catalogue (EPC) for URJ200/VDJ200 showing the “Valve, Cooler Expansion” under PNC 88515, and DENSO technical literature describing Toyota passenger vehicles using TXV systems paired with a receiver–drier. Dual A/C models also carry a second TX valve for the rear evaporator.

The TX valve is the metering brain of the Land Cruiser’s A/C. It adjusts how much liquid refrigerant enters the evaporator based on temperature at the outlet (superheat), keeping the core cold without flooding the compressor. That smart control gives steady cabin temps, stops evaporator icing, and helps the big wagon stay comfy whether it’s idling at the boat ramp or cruising the Nullarbor. Depending on market, the system runs R‑134a or R‑1234yf—either way, the TX valve’s job is the same: meter flow so the evaporator boils refrigerant efficiently and the compressor stays safe from liquid slugging.

It’s not a routine service item, but it’s definitely one to check when A/C performance goes off. Typical clues the TX valve may be restricted or sticking include:

• Weak or fluctuating cooling, especially at idle or after a hot soak
• Evaporator or suction line frosting, or vent temps that swing hot–cold
• Pressure readings that don’t track load (very low suction with normal/high head, or erratic needle movement)
• Audible hissing near the evaporator case that isn’t just normal expansion noise

Replacement is straight‑forward for a trained tech but involves a bit of labour. The front TX valve is mounted at the evaporator inside the HVAC case, access is from inside the cabin. Rear A/C models have a second valve in the rear quarter trim. Proper procedure is to recover refrigerant, replace the valve and O‑rings, renew the receiver–drier/desiccant, evacuate the system to deep vacuum, and recharge by weight with the specified gas. Add the correct compressor oil type and quantity for component replacement, leak‑test, and confirm blend door operation. Because refrigerant handling is regulated, it’s best left to an ARCtick‑licensed (or NZ equivalent) technician.

If the vehicle’s otherwise healthy, a TX valve can last years. Keep the condenser clean, fix any leaks promptly, and always insist on a weighed recharge after any A/C work—this engine bay is tight, and charge accuracy matters for stable superheat and long compressor life.

• Does a 2018 Toyota Land Cruiser have a TX valve or an orifice tube?
  It uses a thermostatic expansion valve at the evaporator (and another for the rear on dual A/C models), not an orifice tube. This layout is shown in Toyota’s Repair Manual and EPC listings for the 200 Series.
• When should the TX valve be replaced?
  Only when diagnosis points to a sticking, restricted, or leaking valve—such as erratic pressures, icing, or persistently poor cooling. It isn’t a scheduled replacement item.
• What refrigerant does the 2018 Land Cruiser use?
  Markets vary between R‑134a and R‑1234yf for this model year. The definitive answer is on the under‑bonnet A/C label, always charge by the specified mass on that label.