Parts for your 2023 Mitsubishi Asx-Tx valve

2023 Mitsubishi ASX TX valve: what it is, why it matters, and how to look after it

Based on technical references — including the Mitsubishi Motors Service Manual (Heating & Air Conditioning group) for ASX/RVR/Outlander Sport, the Mitsubishi ASA parts catalogue for GA/GC/GM-series ASX listing an evaporator-mounted “Expansion Valve” (common part families 7815A1xx), and aftermarket catalogues from DENSO and major Australian suppliers that specify a TX valve for 2010–2023 ASX — the 2023 Mitsubishi ASX as sold in Australia and New Zealand is fitted with a thermostatic expansion valve (TXV).

On the 2023 ASX, the TX valve is the metering brain of the air-con system. It sits at the evaporator and regulates how much liquid refrigerant enters, responding to temperature at the evaporator outlet so the system holds the right superheat. That keeps cabin temps consistent, protects the compressor from liquid slugging, and helps the ASX cool well in stop–start city traffic and on open-road cruises.

For servicing, the TX valve doesn’t have a scheduled replacement interval, it’s more of a “replace on condition” item. It’s commonly renewed if the system shows signs of restricted flow or erratic metering, or whenever the A/C circuit has suffered contamination (for example, after a compressor failure). Because the ASX’s receiver–drier is integrated in the condenser on many variants, it’s good practice to replace the drier element (or condenser assembly where applicable) any time the system is opened, alongside new O-rings at the TXV connections.

Typical fault clues include weak cooling at idle then suddenly cold when moving, frost forming on the TXV or evaporator lines, rapid hissing at the dash, and gauge readings showing low suction with normal/high head pressure. Professional diagnosis with manifold gauges, temperature probes, and superheat checks quickly separates a TXV issue from undercharge or condenser airflow problems.

Replacement is a licenced technician job under ARCtick rules. The correct refrigerant (many AU/NZ ASX vehicles use R-134a, while some markets specify R-1234yf) and the specified PAG oil viscosity must be verified from the under‑bonnet label. The usual steps are recover refrigerant, replace the valve and O‑rings, evacuate to a deep vacuum, pressure/leak test, then recharge to the exact weight. Expect roughly 1.5–3.0 hours labour depending on access, with total costs typically in the AUD/NZD $350–$800 range using quality parts. Done right, the ASX’s TX valve delivers reliable, quiet cooling with stable vent temps through the hottest Aussie and Kiwi summers.

• Tell‑tales of TXV trouble: uneven cooling, frost on lines, noisy cycling, odd gauge readings.
• Best practice: renew O‑rings, replace/refresh the drier, evacuate thoroughly, charge by weight.
• Always use licenced A/C technicians and the refrigerant/oil shown on the vehicle label.

Technical sources referenced: Mitsubishi Motors Service Manual (ASX/RVR/Outlander Sport – Heating & Air Conditioning), Mitsubishi ASA parts catalogue (GA/GC/GM ASX – Expansion Valve at evaporator), DENSO Aftermarket A/C catalogue and Australian application guides listing TX valves for 2010–2023 ASX.

Popular questions about 2023 Mitsubishi ASX TX valve

Does the 2023 Mitsubishi ASX use a TX valve or an orifice tube?
The AU/NZ 2023 ASX uses a thermostatic expansion valve mounted at the evaporator, not a fixed orifice tube. This matches the Mitsubishi service literature and major parts catalogues for GA/GC/GM-series ASX models.

What are the signs the TX valve on a 2023 ASX is failing?
Owners may notice cabin temps swinging hot–cold, poor cooling at idle, frost on the TX valve or evaporator outlet, or unusual hissing. A technician will usually confirm with pressure readings showing low suction and normal/high discharge, plus superheat checks at the evaporator outlet.

How much does TX valve replacement typically cost?
In Australia and New Zealand, typical totals land around AUD/NZD $350–$800 including recovery, valve and O‑rings, vacuum, leak testing and recharge. Costs vary with access time, refrigerant type and whether the drier/condenser is renewed at the same time.