Parts for your 2020 Toyota Land cruiser-Tx valve

2020 Toyota Land Cruiser TX Valve (Thermal Expansion Valve)

Technical sources confirm a TX valve is fitted to the 2020 Toyota Land Cruiser (200 Series). Toyota’s 200 Series Repair Manual includes “Cooler Expansion Valve” removal/installation and inspection procedures, and the Toyota Electronic Parts Catalogue lists “Valve, Cooler Expansion” for the 2020 Land Cruiser—front, and an additional rear valve on vehicles with rear air. Denso HVAC literature also outlines the TXV’s role in metering refrigerant flow to the evaporator on this style of system.

On a 2020 Land Cruiser, the TX valve (often called a TXV) meters refrigerant into the evaporator based on temperature and pressure, keeping the evaporator nicely superheated so it doesn’t flood with liquid. That means stable cabin temps, strong cooling at idle and cruise, and better compressor protection. Models with rear air have two evaporators and therefore two TX valves—one up front in the HVAC case, and another at the rear unit.

When a TX valve sticks or goes out of spec, owners will usually notice weak or inconsistent cooling, icing on lines or the evaporator, hissing at the case, or big pressure swings on gauges. Front-only symptoms point to the front TXV, poor rear cooling on a dual A/C model often traces to the rear valve. Because the TXV sets superheat, a misbehaving one can make the system feel fine on the open road but hopeless at idle on a warm Aussie or Kiwi afternoon.

Replacement and servicing are best left to a licensed A/C technician (ARCtick in Australia). Proper service involves safely recovering the refrigerant, removing trim to access the evaporator case (glovebox area for the front, rear quarter for the rear), replacing the TXV with new O‑rings, adding the correct compressor oil type and quantity for the refrigerant in the vehicle (most AU/NZ 200 Series use R‑134a, some markets moved to R‑1234yf—always check the under‑bonnet label), evacuating to a deep vacuum, and weighing the charge back in to the factory spec. If the system’s been opened, it’s smart practice to replace the receiver/drier or desiccant bag (on many 200s it’s integrated with the condenser). Finish with a leak test and performance check through the centre vents. Routine care is simple: keep the cabin filter fresh, ensure the condenser’s clean of bugs and seeds, and address any odd A/C behaviour early so a sticky TXV doesn’t snowball into compressor grief.

• Front-only A/C: one TX valve at the front evaporator.
• Dual A/C: a second TX valve at the rear evaporator assembly.

Popular questions about 2020 Toyota Land Cruiser TX Valve

Does the 2020 Land Cruiser use a TX valve or an orifice tube?
It uses thermostatic expansion valves. There’s a front TXV on all models, and on vehicles with rear air there’s a second TXV at the rear evaporator. Toyota’s workshop manual and EPC both identify these “Cooler Expansion Valves”.

What are the signs the TX valve needs replacing on a 200 Series?
Weak cooling at idle, frosted lines or evaporator, temperature swings, or noisy hissing at the HVAC case are common flags. On dual A/C models, poor rear cooling with normal front performance often points to the rear TXV. Proper diagnosis with manifold gauges and temperature checks is recommended.

Do you need to change the receiver/drier when replacing a TX valve?
Best practice is yes. Once the system is opened, moisture control matters. Many 200 Series variants have the desiccant bag integrated in the condenser, replacing it, along with the TXV’s O‑rings and adding the correct oil, helps ensure a reliable repair.