Parts for your 2022 Mitsubishi Asx-Tx valve

2022 Mitsubishi ASX tx-valve: purpose, servicing and replacement

Based on technical references including Mitsubishi Motors ASX/RVR workshop manual HVAC sections for the GA/GB series and parts catalogues used by dealers and DENSO-based aftermarket listings, the 2022 Mitsubishi ASX is fitted with a thermostatic expansion valve (often shortened to tx-valve or TXV) at the evaporator inlet, rather than an orifice-tube system. Those documents identify an expansion (metering) valve mounted near the firewall on the evaporator connections, confirming the tx-valve is relevant to this model year.

On the 2022 ASX, the tx-valve’s job is to meter the right amount of liquid refrigerant into the evaporator while maintaining correct superheat. By responding to evaporator outlet temperature and pressure, it helps keep vent temps stable, maximises cooling at idle and cruise, and prevents liquid floodback that can damage the compressor. When the valve sticks or drifts out of spec, drivers may notice slow cool-down, vent temps that hunt hot–cold, frost or sweating on one A/C line at the firewall, or unusual hissing. A pro gauge set will often show low evaporator pressure with poor cooling (valve underfeeding) or high suction and potential floodback (overfeeding).

The tx-valve is not a routine “replace-by-date” service item. During an A/C service, a licensed technician should verify charge weight, inspect for leaks, check condenser and cabin filter condition, log vent temps, and compare high/low-side pressures. If the system has been open to atmosphere or contaminated (for example, after a compressor failure), best practice is to replace the receiver-drier and tx-valve, flush where approved, renew O-rings, evacuate properly, and recharge by weight with the refrigerant specified on the under-bonnet label. Using a quality OE or OE-equivalent valve matched to the ASX calibration helps avoid driveability niggles like evaporator freeze-up.

Access on the ASX is typically at the evaporator connections near the firewall, exact steps vary by variant and may involve cowl or glovebox area trim. Because refrigerant handling is controlled in Australia (ARCtick) and New Zealand, work should be carried out by licensed A/C technicians. They’ll also reinsulate the valve/lines after fitment and verify superheat and vent performance on road test.

Good habits that support tx-valve longevity on this model include keeping the condenser and cabin filter clean, running the A/C regularly year-round, and addressing any cooling performance drop early before debris or moisture can compromise the valve.

Popular questions about the 2022 Mitsubishi ASX tx-valve

Does the 2022 ASX use a tx-valve or an orifice tube?
Technical manuals and parts catalogues for the GA/GB-series ASX show a thermostatic expansion valve at the evaporator inlet. It isn’t an orifice-tube/accumulator setup.

What are the signs the tx-valve needs replacing on an ASX?
Common clues include slow or inconsistent cooling, iced or sweating lines at the firewall, and pressure readings that don’t match spec. Similar symptoms can come from low refrigerant or a weak compressor, so proper diagnosis is essential.

Is tx-valve replacement part of regular servicing?
No. It’s replaced when faulty or when the system has been contaminated or opened. During routine A/C servicing a licensed technician will check operation, leak-test, and confirm the correct charge, advising replacement only if needed.