Parts for your 2018 Mitsubishi Outlander-Tx valve

2018 Mitsubishi Outlander tx-valve — purpose, servicing and replacement

Technical sources confirm the 2018 Mitsubishi Outlander is fitted with a thermostatic expansion valve (TXV). Mitsubishi Motors service information (Heating & Air Conditioning/Group 55 for the 2016–2020 Outlander), the Mitsubishi ASA electronic parts catalogue, and common aftermarket catalogues for this model all list an A/C expansion (tx) valve mounted at the evaporator case. So, a tx-valve is absolutely relevant on this vehicle.

On the Outlander, the tx-valve meters refrigerant into the evaporator based on temperature and pressure (superheat). By matching flow to heat load, it keeps cabin temps steady, protects the compressor from liquid slugging, and helps the system cool efficiently at idle and while cruising. Paired with the Outlander’s modern compressor and condenser with integrated drier, the TXV is a key bit of kit for consistent, quiet, efficient air con performance in Aussie and Kiwi conditions.

It’s not a scheduled replacement item, but it does benefit from sensible servicing habits. Any time the system is opened, replace the O-rings at the valve connections, use the correct refrigerant oil specified on the under-bonnet label, and always evacuate and recharge by weight. If the system’s had a compressor failure or contamination, the valve can clog, in those cases, replacement of the tx-valve and the drier element (often part of the condenser assembly) is good practice.

• Typical symptoms of a crook tx-valve: wildly fluctuating cabin temps, frost on the evaporator or the small line at the firewall, hiss at the valve, low suction with starved evaporator, or high head pressure with poor cooling.
• Location: at the evaporator inlet/outlet, usually at the firewall side of the HVAC case where the A/C pipes enter the cabin.
• Replacement pointers: recover refrigerant, remove line clamps and fasteners, swap the valve and O-rings, torque to spec, evacuate, and recharge to factory capacity. A nitrogen pressure test and a vacuum hold test help catch leaks before re-gassing.

Because handling refrigerant requires licences and environmental care (ARCtick in Australia and equivalent approvals in New Zealand), it’s best left to a qualified auto A/C technician. With the right parts and procedure, the Outlander’s tx-valve will keep the air con crisp through long summers and wet winters alike.

Popular questions about the 2018 Mitsubishi Outlander tx-valve

Does the 2018 Outlander use a tx-valve or an orifice tube?
It uses a thermostatic expansion valve at the evaporator. That setup gives better control of superheat and steadier vent temps than a fixed orifice, which suits the Outlander’s compressor and climate control strategy.

When should the tx-valve be replaced?
There’s no fixed interval. Replace it if it’s restricted or stuck, after compressor failure or heavy contamination, or when diagnostics point to incorrect superheat and flow control. Always replace O-rings and confirm correct oil and refrigerant charge during the job.

What are the signs of a failing tx-valve?
Look for poor or intermittent cooling, icing on the evaporator or lines, uneven vent temps, abnormal gauge readings (very low suction or erratic pressures), and audible hissing at the firewall. A pro will confirm with pressure readings and temperature drop tests.